CN101257012A - light emitting device - Google Patents

Abstract

An object of the present invention is to provide a light-emitting device capable of obtaining high luminous efficiency while maintaining high color rendering, and capable of emitting light of desired chromaticity. The light-emitting device of the present invention is characterized in that it includes: a substrate, and three or more light-emitting part groups that emit monochromatic light and are arranged on the substrate in a predetermined arrangement pattern, and one of the light-emitting part groups has A plurality of light-emitting elements that emit blue light arranged on the substrate, and a transparent resin layer coated on the light-emitting elements, the light-emitting portion group other than the light-emitting portion group having the transparent resin layer has a light-emitting portion group arranged on the substrate. a plurality of light-emitting elements that emit blue light, and a phosphor layer coated on the light-emitting elements that includes a phosphor that emits visible light using blue light emitted from the light-emitting elements, and The types and compounding ratios of the phosphors in each light-emitting portion group are the same.

Description

light emitting device

technical field

The present invention relates to light-emitting devices such as light-emitting diodes.

Background technique

LED lamps using light-emitting diodes (Light Emitting Diode, LED) are rapidly developing in various fields such as backlighting of liquid crystal displays, mobile phones, information terminals, etc., and indoor and outdoor advertisements. Furthermore, LED lamps have the characteristics of long life, high reliability, low power consumption, high impact resistance, high display color purity, compactness, lightness, etc., so they are not only suitable for industrial use, but also are being tried for use in For general lighting purposes. When applying such an LED lamp to various uses, it is crucial to obtain white light emission.

As a representative method of using LED lamps to realize white light emission, the following three methods can be cited: (1) the method of using three kinds of LED chips that emit blue, green and red light; (2) the LED that emits blue light The method of combining the chip with yellow to orange emitting phosphors; (3) the method of combining ultraviolet emitting LED chips with blue, green and red emitting three-color mixed phosphors. Among these methods, the method (2) is generally widely used. In addition, as the structure of the LED lamp to which the above-mentioned aspect (2) is applied, generally speaking, it is a structure in which a transparent resin mixed with a phosphor is poured into a cup-shaped frame (frame) equipped with an LED chip, and the The resin is cured to form a phosphor-containing resin layer (see, for example, JP-A-2001-148516). In addition to the above-mentioned cannonball-type LED elements or SMD (Surface Mounting Device, Surface Mounting Device) types, in order to achieve high brightness, a chip-on-board (Chip-on-board) with multiple chips mounted on a substrate (board) has also been developed. On Board, COB), and has received attention. The properties required for general lighting include color rendering as an indicator of color rendering, especially the average color rendering index Ra, in addition to high efficiency (luminous efficiency) as LED lamps. The color rendering is required to imitate the adjustment range (lineup) of Ra 80 to 85 or greater than or equal to Ra 90 of fluorescent lamps and the like.

Color rendering refers to the use of lighting close to natural light as standard light to evaluate the color rendering under the light source. The color rendering index is expressed in numerical values. The magnitude of the color shift produced by lighting. The color rendering index includes the average color rendering index Ra and the special color rendering index Ri. The average color rendering index Ra represents the average value of the color rendering index values of test No.1 to No.8. The special color rendering index Ri represents the respective special color rendering index values of Test No.9 to No.15. The color rendering index Ra is an index to indicate whether it faithfully reproduces the color under the illumination of a white light source as a standard light source. In principle, the closer the color rendering index Ra is to 100, the better the color rendering.

Generally speaking, the so-called high-color-rendering LED lamps with a high average color rendering index Ra use blue light from the LED chip to use YAG (Yttrium Aluminum Garnet, Yttrium Aluminum Garnet) that emits light with a wavelength of 540-560nm. White light with excellent color rendering is synthesized by combining yellow light emission from a yellow phosphor such as garnet and red light emission from a red light emitter that emits light with a wavelength of 620 nm. In order to increase the average color rendering index Ra, a red phosphor that emits red light is usually used as described above, but the red phosphor not only uses blue light around 460nm for excitation, but also uses green light emitted from the green phosphor And the yellow light emitted from the yellow-based phosphor is used for excitation, so if a red-emitting phosphor is used, the luminous efficiency of the LED lamp will be reduced by about half, and there is a problem that the luminous efficiency is greatly reduced.

Therefore, attempts are being made to use red-emitting light-emitting elements instead of red-emitting phosphors. However, the red light emitted from this light emitting element is not broad-band (broad) light, and its half-value width is narrow. Therefore, although the color temperature may be lowered, the increase in the average color rendering index Ra is small. Therefore, it is difficult to achieve an average color rendering index Ra of 85 or even 90 or more when high color rendering is achieved.

In addition, for light color, that is, color temperature, when considering HID (high-intensity discharge, high-intensity discharge) lamps, light bulbs, and fluorescent lamps, it is necessary to achieve various color temperatures up to 6700K, 5000K, 4200K, and 3000K (2850K). Adjustment range. In general, in order to correspond to such an adjustment range, only white LED lamps corresponding to each color temperature are required. On the other hand, a color-variable LED lamp has been proposed (for example, refer to Japanese Patent Application Laid-Open No. 2005-100799). However, this kind of color-changing LED can only change color in one direction during the adjustment from the white LED, so there is a problem that the color deviation (DUV) is shifted away from the black body radiation, and compared with the change in color temperature, The quality of the color is degraded due to the variation of the deviation. Therefore, it is not only necessary to achieve color change in one direction, but also to realize color change in a desired (arbitrary) direction.

It can be seen that the above-mentioned existing light-emitting device obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently. In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above-mentioned problems. This is obviously the relevant industry. urgent problem to be solved. Therefore, how to create a light-emitting device with a new structure is one of the current important research and development topics, and it has also become a goal that the industry needs to improve.

In view of the defects existing in the above-mentioned existing light-emitting devices, the inventor, based on years of rich practical experience and professional knowledge engaged in the design and manufacture of such products, and in conjunction with the application of academic principles, actively researched and innovated, in order to create a new structure of light-emitting devices. The device can improve the general existing light-emitting devices to make them more practical. Through continuous research, design, and after repeated trial samples and improvements, the present invention with practical value is finally created.

Contents of the invention

The purpose of the present invention is to overcome the defects existing in the existing light-emitting devices, and provide a light-emitting device that can maintain high color rendering and obtain high luminous efficiency, and can realize light emission of desired chromaticity, which is very suitable. practical.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. In order to achieve the above object, the light-emitting device according to the present invention includes: a substrate; and a group of light-emitting parts, wherein the group of light-emitting parts is arranged on the substrate according to a predetermined arrangement pattern and emits monochromatic light respectively. Three or more light emitting unit groups, one of the light emitting unit groups has a plurality of light emitting elements emitting blue light arranged on the substrate, and a transparent resin layer covering the light emitting elements, and the transparent resin layer has the transparent resin layer The light-emitting section group other than the light-emitting section group has a plurality of light-emitting elements emitting blue light arranged on the substrate, and a phosphor layer covering the light-emitting elements and containing a phosphor that utilizes the blue light. Phosphors that emit visible light with colored light, and the types and compounding ratios of the phosphors in each light-emitting portion group are the same.

In the aforementioned light-emitting device, the light-emitting portion groups other than the light-emitting portion group having the transparent resin layer are composed of a first light-emitting portion group, a second light-emitting portion group, and a third light-emitting portion group, and the first light-emitting portion group has a phosphor layer including a green phosphor that emits green light when excited by blue light emitted from the light-emitting element, the second light-emitting portion group has a phosphor layer including a yellow phosphor, and The yellow phosphor is excited by the blue light emitted from the light emitting element to emit yellow light, the third light emitting part group has a phosphor layer containing a red phosphor, and the red phosphor receives light from the light emitting element The emitted blue light is excited to emit red light.

In the aforementioned light-emitting device, the light-emitting portion groups other than the light-emitting portion group having the transparent resin layer are composed of a first light-emitting portion group and a third light-emitting portion group, and the first light-emitting portion group has fluorescent light including a green phosphor. a body layer, the green phosphor is excited by the blue light emitted from the light-emitting element to emit green light, and the third light-emitting part group has a phosphor layer containing a red phosphor, and the red phosphor is stimulated by the The blue light emitted by the light emitting element is excited to emit red light.

In the aforementioned light-emitting device, the light-emitting portion groups other than the light-emitting portion group having the transparent resin layer are composed of a first light-emitting portion group, a second light-emitting portion group, and a third light-emitting portion group, and include a red light-emitting element, and the The first light-emitting part group has a phosphor layer containing a green phosphor that emits green light when excited by blue light emitted from the light-emitting element, and the second light-emitting part group has a phosphor layer containing a yellow phosphor. phosphor layer, the yellow phosphor is excited by the blue light emitted from the light-emitting element to emit yellow light, the third light-emitting part group has a phosphor layer containing a red phosphor, and the red phosphor Red light is emitted by being excited by the blue light emitted from the light emitting element.

In the aforementioned light-emitting device, the light-emitting portion groups other than the light-emitting portion group having the transparent resin layer are composed of a first light-emitting portion group and a third light-emitting portion group, and include a red light-emitting element, and the first light-emitting portion group has a phosphor layer including a green phosphor that emits green light when excited by blue light emitted from the light-emitting element, the third light-emitting portion group has a phosphor layer including a red phosphor, and The red phosphor is excited by the blue light emitted from the light emitting element to emit red light.

The purpose of the present invention and the solution to its technical problems are also achieved by the following technical solutions. In order to achieve the above object, the light-emitting device according to the present invention includes: a substrate; and a group of light-emitting parts, wherein the group of light-emitting parts is arranged on the substrate according to a predetermined arrangement pattern and emits monochromatic light respectively. Three or more light-emitting unit groups having a plurality of light-emitting elements that emit ultraviolet light arranged on the substrate, and a phosphor layer containing a phosphor that utilizes the ultraviolet light to Phosphors that emit visible light, and the types and compounding ratios of the phosphors in each light-emitting portion group are the same.

In the aforementioned light-emitting device, the light-emitting part group is composed of a fourth light-emitting part group, a fifth light-emitting part group, a sixth light-emitting part group, and a seventh light-emitting part group, and the fourth light-emitting part group has a phosphor layer, the blue phosphor is excited by the ultraviolet light emitted from the light-emitting element to emit blue light, the fifth light-emitting part group has a phosphor layer containing a green phosphor, and the green phosphor The sixth light emitting part group is excited by the ultraviolet light emitted from the light emitting element to emit green light. The sixth light emitting part group has a phosphor layer containing a yellow phosphor that receives ultraviolet light emitted from the light emitting element. Yellow light is emitted by excitation of ultraviolet light, and the seventh light-emitting portion group has a phosphor layer containing a red phosphor that emits red light when excited by ultraviolet light emitted from the light-emitting element.

In the aforementioned light-emitting device, the predetermined arrangement pattern is in the form of a line or a matrix.

The aforementioned light-emitting device emits white light using light from the light-emitting portion group.

In the aforementioned light-emitting device, the color temperature of the white light is 6500-6700K (day white).

In the aforementioned light-emitting device, the color temperature of the white light is 2850-3000K (bulb color).

The aforementioned light emitting device emits light with an adjusted variable color gamut by using the light from the light emitting unit group.

In the aforementioned light-emitting device, the variable color gamut is adjusted by using the light from the light-emitting unit group to emit light with a desired color temperature.

Here, the light-emitting portion group is composed of a plurality of light-emitting elements arranged on a substrate in a predetermined arrangement pattern, and a phosphor layer containing phosphor or a transparent resin layer not containing phosphor covering the light-emitting elements. constituted. Furthermore, the light-emitting element that emits blue light emits blue light having a dominant wavelength of 420-480 nm (for example, 460 nm), and the emitted blue light excites the phosphor so that the phosphor emits visible light. Examples of the light-emitting element emitting blue light used in the present invention include, but not limited to, blue light-emitting LED chips and the like. Furthermore, the light-emitting element that emits ultraviolet light emits ultraviolet light having a dominant wavelength of 350-410 nm (for example, 365 nm), and the emitted ultraviolet light excites the phosphor so that the phosphor emits visible light. Examples of the light-emitting element that emits ultraviolet light used in the present invention include, but are not limited to, ultraviolet-emitting LED chips and the like.

Moreover, the phosphor used in the light-emitting element that emits blue light is excited by the blue light to emit visible light, and the desired luminescent color (monochromatic color) can be obtained by color mixing of the visible light and the blue light emitted from the light-emitting element. ). As these phosphors, green phosphors that emit green light when excited by the blue light, yellow phosphors that emit yellow light when excited by the blue light, and red phosphors that emit red light when excited by the blue light can be used. red phosphor. Furthermore, phosphors used in light-emitting elements that emit ultraviolet light are excited by the ultraviolet light to emit visible light, thereby obtaining a desired luminous color (monochromatic). As these phosphors, blue phosphors that emit blue light when excited by the ultraviolet light, green phosphors that emit green light when excited by the ultraviolet light, and yellow phosphors that emit yellow light when excited by the blue light can be used. A yellow phosphor that emits light and a red phosphor that emits red light when excited by the blue light.

Furthermore, the phosphor layer containing a phosphor is formed by adding the phosphor to a transparent resin such as a silicone resin or an epoxy resin, and mixing and dispersing it. The phosphor layer may be formed to cover the outside of the light-emitting element, but a transparent resin layer may be formed in advance so as to directly cover the light-emitting element, and a layer containing the phosphor may be provided on the transparent resin layer. In addition, when blue light is emitted (radiated), only a transparent resin layer containing no phosphor is formed instead of the phosphor layer. In addition, the types and compounding ratios of the phosphors are the same in each light-emitting portion group. The same type of phosphors means that the types of phosphors used, for example, the structures and compositions of the phosphors are (substantially) the same. The compounding ratio of the phosphors is (substantially) the same, which means that the compounding ratios (compounding amounts) of the phosphors in the phosphor layers containing the phosphors are the same. Since the types and compounding ratios of the phosphors are the same in each light-emitting portion group, unevenness in emission of monochromatic light from the phosphors can be suppressed, and light emission with less unevenness in chromaticity and the like can be obtained from the light-emitting device.

Also, any arrangement pattern can be used for the arrangement pattern of the light emitting portion group on the substrate, but it is preferably linear or matrix. By forming the phosphor layer in a linear or matrix form on a plurality of light emitting elements on the same substrate, it is possible to further suppress the unevenness of the phosphor in each light emitting portion group, especially the unevenness due to the coating amount. Moreover, when the arrangement pattern is linear, it is easy to make the types and compounding ratios of the phosphors in each light-emitting portion group the same, and it is also easy to manufacture. When the arrangement pattern is a matrix, the single phosphor obtained from each light-emitting portion group Color mixing of shades becomes easy. Furthermore, when the phosphor layer is formed linearly, that is, on a plurality of chips, the coating amount of the phosphor layer formed linearly, that is, the thickness (optical path length) can be made more uniform.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. By virtue of the above technical solution, the present invention (name) has at least the following advantages and beneficial effects:

The light-emitting device of the present invention uses three or more light-emitting part groups that use blue light-emitting elements and emits monochromatic light, thereby exciting the phosphors of each light-emitting part group. Since monochromatic light is obtained, it is possible to provide a light-emitting device that can maintain high color rendering, obtain high luminous efficiency, and realize light emission of desired chromaticity.

The light-emitting device of the present invention uses three or more light-emitting part groups that use ultraviolet light-emitting elements and emits monochromatic light, so that the phosphors of each light-emitting part group can be excited. Since monochromatic light is obtained, it is possible to provide a light-emitting device that can maintain high color rendering, obtain high luminous efficiency, and realize light emission of desired chromaticity.

In the light-emitting device of the present invention, a red phosphor is used in the phosphor layer covering the light-emitting element in one light-emitting portion group, so that it is possible to reduce the absorption of green light and yellow light by the red phosphor as excitation light, Therefore, it is possible to provide a light-emitting device capable of achieving higher luminous efficiency while maintaining higher color rendering, and capable of emitting light of desired chromaticity.

In the light-emitting device of the present invention, a red phosphor is used in a phosphor layer covering the light-emitting element in one light-emitting portion group, and a red light-emitting element is used, so that a light-emitting device capable of maintaining high color rendering can be provided. A light-emitting device with reduced color temperature and higher luminous efficiency.

In the light-emitting device of the present invention, the predetermined arrangement pattern is linear or matrix, and unevenness of the phosphor can be further suppressed, so that light emission with less unevenness in chromaticity and the like can be obtained.

The light-emitting device of the present invention can obtain white light at a desired color temperature with less deviation from black-body emission.

The light-emitting device of the present invention can obtain daytime white light with less deviation from black-body emission.

The light-emitting device of the present invention can obtain light bulb color light with less deviation from black-body emission.

The light-emitting device of the present invention can change the color in the required direction in the chromaticity, so as to obtain the light with the required chromaticity after adjusting the variable color gamut, and realize the variable color adjustment range within the range corresponding to the application. . Furthermore, it can be used not only for lighting but also as a display panel and the like.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a plan view showing an example of a light emitting device according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line F-F of Fig. 1 .

3 is a schematic diagram showing an example of a light emitting device in which three groups of light emitting part groups are arranged in parallel in a line.

FIG. 4 is a schematic diagram showing an example of a light emitting device in which four groups of light emitting part groups are arranged in parallel in a line.

5 is a schematic diagram showing an example of a light emitting device in which four groups of light emitting part groups are arranged in parallel in two-stage lines.

FIG. 6 is a schematic diagram showing an example of a light emitting device in which four light emitting unit groups are arranged in a matrix.

Fig. 7 is a schematic diagram showing the chromaticity (variable color gamut) of the light emitted by the light emitting device according to the embodiment of the present invention.

1: LED light 2: LED chip

2a: Semiconductor light-emitting layer 2b: Component substrate

2B: blue luminous part group 2Y: yellow luminous part group

2R: Red light-emitting group 2G: Green light-emitting group

3: Circuit pattern 3a/3b: End-side circuit pattern

3c/3d: Power supply pattern part 4: Substrate

6: Bonding wire 7: Recess

8: Frame 9: Phosphor-containing resin layer

9B: Transparent resin layer 9R: Red phosphor resin layer

9G: Green phosphor resin layer 31: Reflective layer

32: Adhesive layer 33: Light diffusion member

34: reflector

Detailed ways

In order to further explain the technical means and effects adopted by the present invention to achieve the intended purpose of the invention, the specific implementation, structure, features and effects of the light-emitting device proposed according to the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. The description is as follows.

1 and 2 show an example of a light emitting device according to an embodiment of the present invention. FIG. 1 is a plan view of the light-emitting device, and FIG. 2 is a longitudinal sectional view of the light-emitting device shown in FIG. 1 cut along line F-F'.

The light-emitting device (COB module) 1 shown in FIGS. 1 and 2 includes: a package substrate, such as a device substrate 4; 2B; green light emitting section group 2G emitting green light; red light emitting section group 2R emitting red light; reflective layer 31 ; circuit pattern 3 ; adhesive layer 32 ; light diffusing member 33 ;

The blue light emitting unit group 2B that emits blue light includes: a plurality of blue LED chips 2; and a resin layer (transparent resin layer) 9B that does not contain phosphor. The green light emitting unit group 2G that emits green light includes: a plurality of blue LED chips 2; and a green phosphor resin layer 9G containing a phosphor that is excited by the blue light and emits green light. The red light emitting unit group 2R that emits red light includes: a plurality of blue LED chips 2; and a red phosphor resin layer 9R containing a phosphor that is excited by the blue light and emits red light.

The blue LED chip 2 is mounted on the substrate 4 having the circuit pattern 3 via the reflective layer 31 and the adhesive layer 32 . On the substrate 4 , the circuit patterns 3 on the cathode side and the anode side are respectively formed via the reflective layer 31 . The circuit pattern 3 is made of an alloy of Cu and Ni, Au, or the like. The upper and peripheral parts of the blue LED chip 2 are coated with a phosphor-containing resin mixed and dispersed in a transparent resin, and the blue LED chip 2 is covered with such a phosphor-containing resin layer 9 . As a transparent resin, a silicone resin, an epoxy resin, etc. can be used, for example.

Green phosphors that emit green when excited by blue light, for example, YAG phosphors such as RE ₃ (Al, Ga) ₅ O ₁₂ :Ce phosphors (RE means at least one selected from Y, G, and La) , AE ₂ SiO ₄ :Eu phosphor (AE represents alkaline earth elements such as Sr, Ba, Ca) or Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce phosphor and other silicate phosphors, sialon Choose from phosphors based on Ca _X Si _y Al _Z ON:Eu ²⁺ , Ca ₃ Sc ₂ O ₄ :Ce phosphors, etc.

The red phosphor that emits red when excited by blue light is not particularly limited, and sulfur oxide phosphors such as La ₂ O ₂ S:Eu phosphors, nitride-based phosphors (for example, AE ₂ Si ₅ N ₈ :Eu ²⁺ or CaAlSiN ₃ :Eu ²⁺ ), etc.

A yellow phosphor that emits yellow when excited by blue light, for example, can be selected from RE ₃ (Al, Ga) ₅ O ₁₂ :Ce phosphor (RE means a phosphor selected from Y, Gd, and La) according to the characteristics or uses of the phosphor. At least one kind of YAG phosphors such as ), TAG phosphors such as (Tb, Al) ₅ O ₁₂ :Ce phosphors, silicon aluminum oxynitride phosphors (such as Ca _X Si _Y Al _Z ON:Eu ²⁺ ), AE Select from ₂ SiO ₄ :Eu phosphors (AE represents alkaline earth elements such as Sr, Ba, and Ca) or silicate phosphors such as Sr ₃ Si ₃ O ₅ :Eu ²⁺ phosphors.

For example, it is possible to use a green phosphor that is excited by the blue light and has a luminous intensity peak (hereinafter, referred to as a luminous peak) within a wavelength range of 500 nm to less than 540 nm. A yellow phosphor with a luminescence peak within a wavelength range of 590 nm to less than 650 nm, and a red phosphor with a luminescence peak, etc. In addition, in this embodiment, a yellow phosphor is used to obtain high luminous efficiency, but even if the yellow phosphor is not used, the green emission of the green phosphor, the red emission of the red phosphor, and the blue emission of the blue LED chip White light can also be obtained by emitting light for color mixing. In addition, the types and compounding ratios of the phosphors of the light-emitting portion groups that emit light of each monochromatic light are adjusted so that the average color rendering index Ra of the light emitted from the light-emitting device is high, high luminous efficiency can be obtained, and furthermore, to obtain white at the desired color temperature, etc.

The device substrate 4 is made of a flat plate made of metal or insulating material, such as synthetic resin, and has a predetermined shape, such as a rectangle, in order to obtain a light emitting area required for the light emitting device 1 . When the device substrate 4 is made of synthetic resin, it can be formed of, for example, epoxy resin added with glass powder or the like. When the device substrate 4 is made of metal, the heat dissipation from the back of the device substrate 4 can be improved, the temperature of each part of the device substrate 4 can be made uniform, and semiconductors emitting light of the same wavelength band can be suppressed from emitting light. The emission color of element 2 is uneven. In addition, examples of metal materials exhibiting such effects include materials having excellent thermal conductivity of 10 W/m·K or more, specifically aluminum or aluminum alloys.

The reflective layer 31 is of such a size that a predetermined number of semiconductor light emitting elements 2 can be arranged, and for example, the reflective layer 31 is adhered to the entire surface of the device substrate 4 . The reflective layer 31 may be made of a white insulating material having a reflectance of 85% or higher in the wavelength region of 400 to 740 nm. As such a white insulating material, an adhesive sheet can be used. Such a pressure-sensitive adhesive sheet can be formed, for example, by impregnating a sheet base material with a thermosetting resin mixed with white powder such as alumina. The reflective layer 31 is bonded to the surface of the device substrate 4 by its own adhesiveness.

The circuit pattern 3 is bonded to the surface of the reflective layer 31 opposite to the surface to which the device substrate 4 is bonded as a conduction element for supplying current to each semiconductor light emitting element 2 . The circuit pattern 3 is formed, for example, in two rows scattered at predetermined intervals in the longitudinal direction of the device substrate 4 and the reflective layer 31 to connect the respective semiconductor light emitting elements 2 in series. On the end side circuit pattern 3a located on one end side of one column of circuit patterns 3, a power supply pattern portion 3c is integrally and continuously formed. The feeding pattern portion 3d is continuously formed. The feeding pattern parts 3 c and 3 d are arranged side by side at one end in the longitudinal direction of the reflective layer 31 , are spaced apart from each other, and are insulated by the reflective layer 31 . Electric wires (not shown) connected to power sources are respectively connected to the respective power supply pattern portions 3c and 3d by welding.

The respective semiconductor light emitting elements 2 are arranged between the adjacent circuit patterns 3 in the longitudinal direction of the device substrate 4 , and are bonded to the same surface of the white reflective layer 31 by the adhesive layer 32 . Specifically, the other surface parallel to the one surface of the element substrate 2 b on which the semiconductor light emitting layer 2 a is laminated is bonded to the reflective layer 31 by the adhesive layer 32 . Through this adhesion, the circuit pattern 3 and the semiconductor light emitting element 2 are arranged in a straight line on the same surface of the reflective layer 31, so the side surfaces of the semiconductor light emitting element 2 and the circuit pattern 3 located in the arrangement direction are close to and opposite to each other. set in a manner. The thickness of the adhesive layer 32 can be set to be equal to or less than 5 μm, for example. For the adhesive layer 32, for example, an adhesive having a light transmittance of 70% or more at a thickness of 5 μm or less can be preferably used, for example, a silicone resin-based adhesive can be preferably used. mixture.

As shown in FIG. 1 and FIG. 2, the electrodes of each semiconductor light emitting element 2 are connected to the circuit patterns 3 disposed on both sides of the semiconductor light emitting element 2 by bonding wires 6. Furthermore, the end-side circuit patterns 3 b located on the other end side of the two rows of circuit patterns 3 are also connected by bonding wires 6 . Therefore, in the case of this embodiment, the respective semiconductor light emitting elements 2 are connected in series. The surface light emitting source of the light emitting device 1 is formed by the above device substrate 4 , reflective layer 31 , circuit pattern 3 , semiconductor light emitting elements 2 , adhesive layer 32 and bonding wire 6 .

The reflector 34 is not individually arranged corresponding to each or every several semiconductor light emitting elements 2, but a single reflector that surrounds all the semiconductor light emitting elements 2 on the reflective layer 31, and the reflector 34 is formed by, for example, a rectangular frame. , the semiconductor light emitting element 2 is disposed in the recess 7 formed by the frame. The reflector 34 is bonded and fixed on the reflective layer 31 . The reflector 34 accommodates a plurality of semiconductor light emitting elements 2 and circuit patterns 3 , and the pair of power supply pattern parts 3 c and 3 d are located outside the reflector 34 . The reflector 34 can be formed, for example, from synthetic resin, and the inner peripheral surface becomes a reflection surface. The reflective surface of the reflector 34 can be formed by vapor-depositing or electroplating a metal material with a high reflectance such as Al or Ni, or by coating a white paint with a high reflectance to visible light. Alternatively, white powder may be mixed into the molding material of the reflector 34 to make the reflector 34 itself white with a high reflectance to visible light. As the white powder, white fillers such as alumina, titanium oxide, magnesium oxide, and barium sulfate can be used. In addition, it is preferable that the reflection surface of the reflector 34 is formed so as to gradually open toward the irradiation direction of the light emitting device 1 .

The phosphor-containing resin layer 9 is formed by mixing a liquid thermosetting resin in which various phosphors are mixed in predetermined compounding amounts for each light-emitting portion group using an injection device such as a dispenser, The semiconductor light emitting elements 2 arranged in a straight line are coated and filled in a line shape, so as to completely bury the surface of the reflective layer 31 and each of the semiconductor light emitting elements 2 arranged in a straight line corresponding to each line (line). The semiconductor light emitting element 2 and the bonding wire 6 etc. are used to obtain the desired monochromatic light, and the thermosetting resin is hardened by heating. Similarly, a phosphor layer containing a phosphor that emits light of a desired color is formed corresponding to a predetermined line of semiconductor light emitting elements 2 arranged in a straight line. In this way, when the phosphor layer (transparent resin layer for blue light) of each light-emitting portion group is formed in a linear shape, it can be easily manufactured and the manufacturing cost is low. In addition, when applying the phosphor-containing thermosetting resin using an injection device such as a dispenser, it is preferable to apply at a high viscosity of, for example, about 14 Pa·S. Furthermore, before coating the thermosetting resin, wall portions for separate coating may be provided on the substrate 4 in advance corresponding to each line. In this way, the phosphors in the same light-emitting part group are formed on the LED blue chip 2 using the same type and the same compounding ratio of the two-component silicone resin, so that the emission of monochromatic light from the phosphors can be suppressed. The unevenness of the light emitted by the phosphor can be obtained with less unevenness in the characteristics of the light emitted by the phosphor, such as luminous intensity or chromaticity (eg, color temperature).

Next, an arrangement pattern for disposing each light emitting portion group on the substrate will be described.

FIG. 3 is a schematic diagram showing an example of a light emitting device in which three groups of light emitting part groups are linearly arranged in parallel along respective semiconductor light emitting elements 2 arranged in a straight line. As shown in FIG. 3 , the light emitting device 1 includes: a light emitting unit group 2G that emits green light when excited by blue light; a light emitting unit group 2R that emits red light; and a light emitting unit group 2B that emits blue light. The light-emitting device of this embodiment can obtain blue light, green light, and red light. The three groups of light-emitting parts arranged in parallel in a line form are the light-emitting part groups that emit the blue light from the blue LED chip 2 through the transparent resin layer, and emit red light when excited by the blue light. The light-emitting part group and the light-emitting part group excited by the blue light to emit green light are sequentially constituted. The circuit pattern 3 can also be set separately for each light emitting part group so that monochromatic light can be emitted individually. In this way, by forming the three types of light-emitting portion groups linearly and parallel along each semiconductor light-emitting element 2, it is possible to further suppress the unevenness of the phosphor in each light-emitting portion group, and in particular, it is possible to further suppress the unevenness due to the coating amount. uniform. Furthermore, since it is applied linearly, it is also easy to manufacture.

FIG. 4 is a schematic diagram showing an example of a light emitting device in which four groups of light emitting part groups are arranged in parallel in a line. The light emitting device 1 includes: a light emitting unit group 2G that emits green light when excited by blue light; a light emitting unit group 2Y that emits yellow light; a light emitting unit group 2R that emits red light; and a light emitting unit group 2B that emits blue light. The light-emitting device of this embodiment can obtain blue light, green light, yellow light, and red light. The four groups of light-emitting parts are sequentially composed of: a light-emitting part group that emits (transmits) blue light, a light-emitting part group that emits green light, a light-emitting part group that emits yellow light, and a light-emitting part group that emits red light. Each of the four groups of light emitting parts may also be provided with a circuit pattern 3 so as to be able to emit monochromatic light individually. In this manner, by arranging the four light emitting unit groups, it is possible to easily adjust the variable color of the chromaticity.

Furthermore, in FIG. 4 , red light emitting elements may be arranged between the light emitting section group 2G that emits green light when excited by blue light, and the light emitting section group 2R that emits red light. In this case, high color rendering can be maintained, and lowering of color temperature and higher luminous efficiency can be obtained. Furthermore, red light-emitting elements are arranged between the light-emitting part group 2G emitting green light and the light-emitting part group 2R emitting red light, and the light-emitting part group 2G and the light-emitting part group 2R are separated, so that the light-emitting part group 2G emitting green light The green light is difficult to be absorbed in the excitation of the red light-emitting phosphor, so that the reduction in luminous efficiency can be suppressed.

Furthermore, in FIG. 4 , the light emitting unit group 2Y that emits yellow light may be changed to a red light emitting element. In this case, in one light-emitting portion group, red phosphor is used in the phosphor layer covering the light-emitting element to form light-emitting portion group 2R emitting red light, and the red light-emitting element is further used, so high color rendering can be maintained. In addition, a reduction in color temperature and higher luminous efficiency can be obtained.

5 is a schematic diagram showing an example of a light emitting device in which four groups of light emitting part groups are arranged in parallel in two-stage lines. Here, the so-called parallel arrangement in a two-stage line means that the LED light-emitting elements 2 on the substrate 4 are arranged in a manner perpendicular to the arrangement direction of the semiconductor light-emitting elements 2 connected by bonding wires and arranged in a straight line. It is divided into two sections, the upper part and the lower part, from approximately the center, and within the respective ranges of the upper part and the lower part, the four groups of light emitting part groups are arranged in a line, so that the respective light emitting part groups of the upper part and the lower part are two by two. parallel. In this way, by arranging the four groups of light-emitting part groups in parallel in two-segment lines, color mixing of monochromatic light can be performed more easily.

FIG. 6 is a schematic diagram showing an example of a light emitting device in which four light emitting unit groups are arranged in a matrix. "Arranging in a matrix" refers to a case where the light emitting part groups are arranged in a grid as shown in FIG. 6 . The circuit patterns 3 may be set separately for each of the four groups of light emitting parts so that monochromatic light can be emitted individually. In this way, by arranging each of the four light emitting part groups in a matrix, color mixing of the monochromatic light from each light emitting part group can be more easily performed, and the light diffusing member 33 can be omitted, or at least the light diffusing member 33 can be thinned. The thickness can suppress the reduction of brightness caused by the use of the light diffusion member 33 .

Furthermore, since the light-emitting device 1 of this embodiment is a COB module, the interval between the LED chips 2 on the substrate 4 can be narrowed (narrow pitch), so that a higher-luminance light-emitting device can be obtained. Furthermore, since the distance between the LED chips 2 can be narrowed, it is possible to obtain light in which monochromatic light obtained from each light emitting portion group is further mixed.

In the LED lamp 1 of this embodiment, the applied electric energy is converted by the LED chip 2 into blue light having a dominant wavelength of 420 to 480 nm (for example, 460 nm) and emitted. The emitted blue light is converted into longer-wavelength light by each phosphor in each light-emitting portion group. According to the light emission color (monochromatic) from each light emitting part group, it mixes with the blue light radiated from the LED chip and becomes monochromatic light. White light obtained by mixing monochromatic light from each of the phosphors is emitted from the LED lamp 1 . The light-emitting device configured in this way can maintain high color rendering and high luminous efficiency, and can obtain light emission of desired chromaticity. Furthermore, white light with suppressed deviation from black body emission at a desired color temperature can be obtained by adjusting the type and compounding amount of the phosphor in each light emitting section group and/or the thickness (optical path length) of the phosphor resin. For example, the color temperature of white light is 6500-6700K (day white), 2850-3000K (bulb color). Therefore, a light emitting device suitable for general lighting can be provided.

Next, another example of the light emitting device according to the embodiment of the present invention will be described. In this embodiment, an ultraviolet light emitting chip is used instead of a blue light emitting chip. As the ultraviolet light-emitting type LED chip, all GaN-based and _InxGa1 - _{xN -} based LED chips that have been previously available can be used.

BAM-based phosphors such as BaMgAl ₁₀ O ₁₇ :Eu ²⁺ can be used as blue phosphors that emit blue light when excited by ultraviolet light, but are not particularly limited. The green phosphor that emits green when excited by ultraviolet light can be, for example, (Sr, Ba) ₂ SiO ₄ :Eu ²⁺ , but is not particularly limited.

As the red phosphor that emits red when excited by ultraviolet light, sulfur oxide phosphors such as La ₂ O ₃ S:Eu ³⁺ phosphors, nitride-based phosphors (such as CaAlSiN ₃ :Eu), etc., can be used. Or a germanate-based phosphor such as manganese-activated magnesium fluoride germanate (2.5MgO·MgF ₂ :Mn ⁴⁺ ), but not particularly limited.

(Y,Gd) ₃ Al ₅ O ₁₂ :Ce or the like can be used as a phosphor that emits yellow when excited by ultraviolet light, but is not particularly limited. For example, a blue phosphor having a peak emission intensity within a wavelength range of 420 nm to 480 nm when excited by the ultraviolet light, and a green phosphor having a peak emission intensity within a wavelength range of 500 nm to less than 540 nm can be used. Phosphors, yellow-based phosphors having an emission peak within a wavelength range of 540 nm to less than 590 nm, red phosphors having an emission peak within a wavelength range of 590 nm to less than 650 nm, and the like. In addition, the types and compounding ratios of the phosphors of the light-emitting portion groups that emit light of each monochromatic light are adjusted so that the average color rendering index Ra of the light emitted from the light-emitting device is high, high luminous efficiency can be obtained, and furthermore, to obtain white at the desired color temperature, etc.

Also in the LED lamp 1 of this embodiment, high color rendering can be maintained, the luminous efficiency is high, and light emission of desired chromaticity can be obtained. Furthermore, white light with suppressed deviation from black body emission at a desired color temperature can be obtained by adjusting the type and compounding amount of the phosphor in each light emitting section group and/or the thickness (optical path length) of the phosphor resin.

Next, light emission from the light-emitting device of the above embodiment will be further described using the CIE chromaticity diagram. Fig. 7 is a graph showing the chromaticity (variable color gamut) of the light emitted by the light emitting device according to the embodiment. Here, the case of using a blue light-emitting chip will be described. The light emitting device 1 includes: a light emitting unit group 2G that emits green light when excited by blue light; a light emitting unit group 2Y that emits yellow light; a light emitting unit group 2R that emits red light; and a light emitting unit group 2B that emits blue light. The light-emitting device of this embodiment can obtain blue light, green light, yellow light, and red light, and therefore can obtain chromaticity in the range shown in FIG. 7 , and it is variable within this range. The details will be described below.

In the chromaticity diagram of FIG. 7 , the chromaticity of blue light emission from a blue LED chip is represented by point A, and the chromaticity of light emitted from a green phosphor having a dominant wavelength of 525 nm is represented by point B, The chromaticity of light emitted from the yellow phosphor having a dominant wavelength of 565 nm is shown at point C, and the chromaticity of light emitted from the red phosphor having a dominant wavelength of 630 nm is shown at point D. Also, the locus of black body radiation (black body locus) is represented by the curve a. Furthermore, on the blackbody locus a, a point E represents a desired color temperature (for example, 5000K), and a straight line including the point E represents a deviation in the color temperature. Similarly, other desired color temperatures on the blackbody locus a and deviations at the color temperatures are represented by each point on the blackbody locus a and a straight line including each point.

The light emission from the green light-emitting part group 2G is the chromaticity of light obtained by mixing the green light from the green phosphor and the blue light from the blue LED chip. On the chromaticity diagram shown in FIG. Arbitrary points (not shown) on the straight line between point A and point B are represented. This point can be moved by adjusting the compounding amount of the green phosphor. For example, this point can be moved to the point B side by increasing the compounding amount of the green phosphor. The light emission from the red light emitting part group 2R can also be moved to an arbitrary point (not shown) on a straight line connecting point A and point D by adjusting the compounding amount of the red phosphor. Here, by adjusting the blending amount of the green phosphor and the blending amount of the red phosphor, the chromaticity of any point in the triangle formed by connecting the points A, B, and C can be obtained. Furthermore, the light emission from the yellow light emitting part group 2Y can also be moved to any point on the straight line connecting point A and point C by adjusting the compounding amount of yellow phosphor similarly (neither is shown). The chromaticity of any point within the quadrilateral connecting points A, B, C, and D can be obtained by adjusting the compounding amounts of the green phosphor, red phosphor, and yellow phosphor. That is, white light with suppressed color variation at a desired color temperature can be obtained. The light emission from the light-emitting part group containing each phosphor can be adjusted not only by adjusting the compounding amount of each phosphor but also by adjusting the thickness (optical path length) of the phosphor resin layer containing each phosphor.

Moreover, each light-emitting part group is set so that current can be supplied from a power source through an electric wire not shown individually through the power supply pattern parts 3c and 3d, so that monochromatic light can be individually emitted, for example, by pulse width control to adjust from The current supplied by the power supply is used to adjust the electric energy applied to the blue LED chips of each light-emitting part group to adjust the light emission of the LEDs, thereby also obtaining the light emission of required chromaticity. In this case, variable coloring can be realized by adjusting the current supplied from the power source without replacing the phosphor compounding amount or phosphor layer thickness (optical path length) of each light-emitting portion group including each phosphor. A variable color light emitting device may be enhanced. Furthermore, within a range corresponding to the application, a variable color adjustment range can be realized, so that it can also be used as a display device.

[Example]

Next, examples of the present invention will be described.

(Example 1)

A COB package with a square of about 5 cm and an average number of chips to be packaged is 11 vertically and 12 horizontally. In addition, it is assumed that the chips in the vertical line of the COB package can be individually lit. The chip used was a blue chip emitting light with a wavelength of 460 nm.

For green light, a green phosphor having a peak wavelength at a wavelength of 525 nm was blended into a two-component transparent silicone resin at about 30 wt % to completely disperse the phosphor. For yellow light, a yellow phosphor having a peak wavelength at a wavelength of 565nm is blended into a two-component transparent silicone resin at about 30 wt%, and for red light, a red phosphor having a peak wavelength at a wavelength of 630nm is added About 30wt% was added to the two-component transparent silicone resin to completely disperse the phosphor. Also, for blue light, only a two-component transparent silicone resin that does not contain phosphors is used.

Next, the various phosphor-containing silicone resins obtained in this way are applied to the recesses 8 with an opening diameter of 3 mm corresponding to each line, so that each line can obtain the desired color, and then, the silicone resin is applied to each line. The resin was cured to form a phosphor-containing resin layer, and the LED lamp 1 having the structure shown in FIG. 1 was produced. In addition, the coating of the resin was carried out at a high viscosity of 14 Pa·s. Separate coating of each color is performed sequentially from the left in the order of blue, yellow, green, and red as shown in Fig. 4 . Furthermore, the optical path length of the phosphor-containing resin layer 9 was set to 1.0 mm. The optical path length refers to the thickness of the phosphor-containing resin layer from the upper surface of the LED chip to the light extraction side.

The LED lamp obtained in this way was made to emit light, and the color temperature of the light emission, the deviation of the color temperature, the average color rendering index Ra, and the luminous efficiency were measured. As a result, it was confirmed that the chromaticity existed within the range of the variable color gamut shown in FIG. 7 . Therefore, it was confirmed that by changing the compounding ratio (wt %) of the green phosphor, the yellow phosphor, and/or the red phosphor, desired chromaticity can be obtained within the variable color range shown in FIG. 7 . Furthermore, it was confirmed that white light without color shift within a predetermined color temperature can be obtained.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence all belong to the scope of the technical solution of the present invention.

Claims (13)

1. light-emitting device is characterized in that it comprises:

Substrate; And

The illuminating part group, described illuminating part group is a Pareto diagram in accordance with regulations and be configured in and send monochromatic illuminating part group more than 3 crowds or 3 crowds respectively on the described substrate, a described illuminating part group has a plurality of light-emitting components that send blue light that are configured on the described substrate, and overlayed on transparent resin layer on this light-emitting component, illuminating part group illuminating part group in addition with described transparent resin layer has a plurality of light-emitting components that send blue light that are configured on the described substrate, and overlayed on the luminescent coating that comprises fluorophor on this light-emitting component, described fluorophor is to utilize described blue light to send the fluorophor of visible light, and kind and the mix proportion of described fluorophor in each illuminating part group is all identical.

2. light-emitting device as claimed in claim 1, it is characterized in that having the illuminating part group illuminating part group in addition of described transparent resin layer, be by the 1st illuminating part group, the 2nd illuminating part group and the 3rd illuminating part group constitute, described the 1st illuminating part group has the luminescent coating that comprises green-emitting phosphor, described green-emitting phosphor is subjected to the exciting of blue light of radiating from described light-emitting component and sends green light, described the 2nd illuminating part group has the luminescent coating that comprises yellow fluorophor, described yellow fluorophor is subjected to the exciting of blue light of radiating from described light-emitting component and sends sodium yellow, described the 3rd illuminating part group has the luminescent coating that comprises red-emitting phosphors, and described red-emitting phosphors is subjected to the exciting of blue light of radiating from described light-emitting component and sends red light.

3. light-emitting device as claimed in claim 1, it is characterized in that having the illuminating part group illuminating part group in addition of described transparent resin layer, be to constitute by the 1st illuminating part group and the 3rd illuminating part group, described the 1st illuminating part group has the luminescent coating that comprises green-emitting phosphor, described green-emitting phosphor is subjected to the exciting of blue light of radiating from described light-emitting component and sends green light, described the 3rd illuminating part group has the luminescent coating that comprises red-emitting phosphors, and described red-emitting phosphors is subjected to the exciting of blue light of radiating from described light-emitting component and sends red light.

4. light-emitting device as claimed in claim 1, it is characterized in that having the illuminating part group illuminating part group in addition of described transparent resin layer, be by the 1st illuminating part group, the 2nd illuminating part group and the 3rd illuminating part group constitute, and possesses red light-emitting component, described the 1st illuminating part group has the luminescent coating that comprises green-emitting phosphor, described green-emitting phosphor is subjected to the exciting of blue light of radiating from described light-emitting component and sends green light, described the 2nd illuminating part group has the luminescent coating that comprises yellow fluorophor, described yellow fluorophor is subjected to the exciting of blue light of radiating from described light-emitting component and sends sodium yellow, described the 3rd illuminating part group has the luminescent coating that comprises red-emitting phosphors, and described red-emitting phosphors is subjected to the exciting of blue light of radiating from described light-emitting component and sends red light.

5. light-emitting device as claimed in claim 1, it is characterized in that having the illuminating part group illuminating part group in addition of described transparent resin layer, be to constitute by the 1st illuminating part group and the 3rd illuminating part group, and possesses red light-emitting component, described the 1st illuminating part group has the luminescent coating that comprises green-emitting phosphor, described green-emitting phosphor is subjected to the exciting of blue light of radiating from described light-emitting component and sends green light, described the 3rd illuminating part group has the luminescent coating that comprises red-emitting phosphors, and described red-emitting phosphors is subjected to the exciting of blue light of radiating from described light-emitting component and sends red light.

6. light-emitting device is characterized in that it comprises:

Substrate; And

The illuminating part group, described illuminating part group is a Pareto diagram in accordance with regulations and be configured in and send monochromatic illuminating part group more than 3 crowds or 3 crowds respectively on the described substrate, described illuminating part group has a plurality of luminescent coatings that send the light-emitting component of ultraviolet light and comprise fluorophor that are configured on the described substrate, described fluorophor is to utilize described ultraviolet light to send the fluorophor of visible light, and kind and the mix proportion of described fluorophor in each illuminating part group is all identical.

7. light-emitting device as claimed in claim 6, it is characterized in that described illuminating part group is by the 4th illuminating part group, the 5th illuminating part group, the 6th illuminating part group and the 7th illuminating part group constitute, described the 4th illuminating part group has the luminescent coating that comprises blue emitting phophor, described blue emitting phophor is subjected to the exciting of ultraviolet light of radiating from described light-emitting component and sends blue light, described the 5th illuminating part group has the luminescent coating that comprises green-emitting phosphor, described green-emitting phosphor is subjected to the exciting of ultraviolet light of radiating from described light-emitting component and sends green light, described the 6th illuminating part group has the luminescent coating that comprises yellow fluorophor, described yellow fluorophor is subjected to the exciting of ultraviolet light of radiating from described light-emitting component and sends sodium yellow, described the 7th illuminating part group has the luminescent coating that comprises red-emitting phosphors, and described red-emitting phosphors is subjected to the exciting of ultraviolet light of radiating from described light-emitting component and sends red light.

8. as the described light-emitting device of arbitrary claim in the claim 1 to 7, it is characterized in that described predetermined arrangement pattern is a wire or rectangular.

9. as the described light-emitting device of arbitrary claim in the claim 1 to 7, it is characterized in that being used to from described illuminating part group's light and send white light.

10. light-emitting device as claimed in claim 9, the colour temperature that it is characterized in that described white light are 6500～6700K (white in daytime).

11. light-emitting device as claimed in claim 9, the colour temperature that it is characterized in that described white light are 2850～3000K (bulb look).

12., it is characterized in that being used to sending the light of variable colour gamut through adjusting from described illuminating part group's light as the described light-emitting device of arbitrary claim in the claim 1 to 7.

13. as the described light-emitting device of arbitrary claim in the claim 1 to 7, it is characterized in that being used to light, variable colour gamut is adjusted and sent the light of required colour temperature from described illuminating part group.

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