CN108922955B - A light source module and a lighting device including the light source module - Google Patents

Abstract

A light source module and a lighting device using the light source module, the light source module includes a first light-emitting element and a packaging part covering the first light-emitting element, the packaging part includes a first additional light-emitting body, a second additional light-emitting body, and a third additional light-emitting body, and the light emitted by each light-emitting body is mixed into warm white light as the emission light of the light source module. The light source module provided by the present invention provides an LED neutral white light (4000K) light source with high light efficiency, high CS value, and high color rendering by controlling the proportion of luminous energy in the 495~560nm wavelength region that has the greatest impact on CS value in the total luminous energy. This high CS value spectrum is particularly suitable for people to concentrate on learning and working under the same illumination.

Description

A light source module and a lighting device including the light source module

Technical Field

The invention relates to a light source module and a lighting device comprising the light source module.

Background technique

With the advent and development of the third lighting technology revolution, incandescent lamps, halogen lamps, etc. have been gradually banned from production and sales by countries around the world due to their low light efficiency and low energy saving. LED lighting fixtures have been widely used instead. Existing LED lighting products mainly solve the problems of energy saving, illumination, color and color rendering. When using LED lighting products, more and more people are concerned that the blue light in LEDs is high, which may affect the physiological rhythm of the human body. For the impact of lighting products on the physiological rhythm of the human body, we can evaluate it through the circadian stimulation (Circadian StimuIus) evaluation model, which is what the industry calls the CS value. The spectrum with a high CS value is particularly suitable for people to concentrate on learning and working under the same illumination. At present, there is a lack of LED lighting products with high CS values on the market that can further consider the impact of light on the physiological rhythm of the human body while taking into account energy saving, illumination, color and color rendering.

Summary of the invention

The purpose of the present invention is to solve the above problems and to find an LED white light source with high CS value, high color rendering index and high light efficiency.

In order to realize the above functions, the technical solution adopted by the present invention is to provide a light source module, characterized in that it includes a first light-emitting element and a packaging part covering the first light-emitting element,

The first light emitting element emits a first color light with a peak wavelength between 435 and 465 nm;

The packaging unit includes:

A first additional light emitting body, the first additional light emitting body is arranged to receive part of the light emitted by the first light emitting element and convert it into a second color light with a peak wavelength of 485-520nm;

A second additional light emitting body, the second additional light emitting body is arranged to receive part of the light emitted by the first light emitting element and convert it into a third color light with a peak wavelength between 530 nm and 580 nm;

A third additional light emitting body, wherein the third additional light emitting body is arranged to receive part of the light emitted by the first light emitting element and convert it into a fourth color light with a peak wavelength between 605 nm and 645 nm,

The first color, the second color, the third color and the fourth color are mixed to form the emitted light of the light source module, and the emitted light is neutral white light, that is, the emitted light is located in the interval surrounded by the points of the correlated color temperature 4000±280K and the distance duv=-0.006 to 0.006 of the black body locus on the CIE1931 color space,

The spectrum of the emitted light is continuously distributed in the visible light range of 380-780nm, and the relative deviation value ΔI of the spectrum intensity of two adjacent points in the spectrum is defined.

Where Intensit(i) and Intensit(i+1) represent the spectral intensity of two points in the spectrum with a wavelength difference of step size I, 1nm≤I≤5nm,

The emission light spectrum includes two peaks, a peak valley and a stable distribution interval:

The first peak is located in the wavelength region of 435 to 465 nm;

The second peak is located in the wavelength region of 605 to 645 nm, and the ratio of the spectral intensity of the second peak to the spectral intensity of the first peak is between 70% and 130%;

The peak and valley are located in the wavelength region of 455 to 485 nm, the ratio of the spectral intensity of the peak and valley to the spectral intensity of the first peak is greater than or equal to 25%, and the width of the peak and valley in the long-wave direction is less than or equal to 30 nm, and the end point of the peak and valley in the long-wave direction is defined as the point close to the peak and valley between the two adjacent points when the first ΔI≤2% appears from the peak and valley position in the long-wave direction, and the width of the peak and valley in the long-wave direction refers to the wavelength difference between the end point of the peak and valley in the long-wave direction and the peak and valley;

The stable distribution interval is a wavelength region of 495 to 560 nm, the ratio of the spectral intensity of any point in the stable distribution interval to the spectral intensity of the first peak is between 60% and 80%, and the ΔI between any two adjacent points is not greater than 1.5%.

Preferably, the ratio of the spectral intensity of the second peak to the spectral intensity of the first peak is between 80% and 110%.

Preferably, the ratio of the spectral intensity of the peak-valley to the spectral intensity of the first peak is between 30% and 60%.

Preferably, the ΔI between any two adjacent points in the stable distribution interval is no greater than 0.8%.

Preferably, the first light-emitting element is a blue light LED with a peak emission wavelength of 435 to 465 nm; the first additional light-emitting body is a blue-green phosphor with a peak wavelength of 485 to 520 nm and a half-width of 25 to 65 nm; the second additional light-emitting body is a yellow-green phosphor combination including yellow phosphor and green phosphor, which contains at least one yellow phosphor with a peak wavelength greater than 540 nm and at least one green phosphor with a peak wavelength less than 540, and the peak wavelength of the yellow-green phosphor combination is 530 to 580 nm, and the half-width is 60 to 115 nm; the third additional light-emitting body is a red or orange phosphor with a peak wavelength of 605 to 645 nm and a half-width of 80 to 120 nm.

Preferably, the sum of the weights of the blue-green phosphor, the yellow-green phosphor combination, and the red or orange phosphor is defined as the total phosphor weight, and the total phosphor weight accounts for 25.0% to 50.0% of the packaging portion.

Preferably, the blue-green phosphor is any one of the following phosphors or a mixture of two or more thereof:

(a) Nitrogen oxide, Eu ²⁺ as activator

Chemical composition formula: (Ba,Ca) _1-x Si ₂ N ₂ O ₂ :Eu _x

Where x = 0.005 to 0.200;

(b) Ga-doped garnet phosphor, Eu ²⁺ as activator

General chemical formula: Ga-LuAG:Eu;

(c) Silicate phosphor, Eu ²⁺ as activator

General chemical formula: Ba ₂ SiO ₄ :Eu.

Preferably, the blue-green phosphor accounts for 15.0-40.0% by weight of the total phosphor.

Preferably, the yellow phosphor/green phosphor is any one of the following phosphors or a mixture of two or more thereof:

(a) Garnet structure phosphor, Ce ³⁺ as activator

Chemical composition formula: (M4) _3-x (M5) ₅ O ₁₂ :Ce _x

Wherein M4 is at least one element selected from Y, Lu, Gd and La, M5 is at least one element selected from Al and Ga, and x is 0.005 to 0.200;

(b) Silicate system phosphor, Eu ²⁺ as activator

Chemical composition formula: (M6) _2-x SiO ₄ ：Eu _x

or (Ba,Ca,Sr) _2-x (Mg,Zn)Si ₂ O ₇ :Eu _x

Wherein M6 is at least one element selected from Mg, Sr, Ca and Ba, and x is 0.01 to 0.20;

(c) Nitrogen oxide phosphor (sialon β-SiAlON), Eu ²⁺ as activator

Chemical composition formula: Si _b Al _c O _{d Ne} :Eu _x

Where x = 0.005 to 0.400, b + c = 12, d + e = 16;

(d) Aluminate system phosphor, Eu ²⁺ as activator

Chemical composition formula: (Sr,Ba) _2-x Al ₂ O ₄ :Eu _x

or (Sr,Ba) _4-x Al ₁₄ O ₂₅ ：Eu _x

Where x=0.01~0.15.

Preferably, the yellow-green phosphor combination accounts for 25.0% to 55.0% by weight of the total phosphor.

Preferably, the red or orange phosphor is any one of the following phosphors or a mixture of two or more thereof:

(a) Nitride red powder with 1113 crystal structure, Eu ²⁺ as activator

Chemical composition formula: (M1) _1-x AlSiN ₃ :Eu _x

Wherein M1 is at least one element selected from Ca, Sr and Ba, and x is 0.005 to 0.300;

(b) Nitride red powder with 258 crystal structure, Eu ²⁺ as activator

Chemical composition formula: (M2) _2-x Si ₅ N ₈ ：Eu _x

Wherein M2 is at least one element selected from Ca, Sr, Ba and Mg, and x is 0.005 to 0.300;

(c) Nitride oxide phosphor (sialon α-SiAlON), Eu ²⁺ as activator

Chemical composition formula: ((M3) _1-a ) _x Si _b Al _c O _d N _e :Eu _a

Wherein M3 is at least one element selected from Li, Na, K, Rb, Cs, Sr, Ba, Sc, Y, La, and Gd, x=0.15-1.5, a=0.005-0.300, b+c=12, d+e=16;

(d) Silicate phosphor, Eu ²⁺ as activator

Chemical composition formula: (Sr,Ba) _3-x Si ₅ O ₅ :Eu _x

Where x=0.005~0.300.

Preferably, the red or orange phosphor accounts for 10.0% to 40.0% by weight of the total phosphor.

Preferably, the half width of the emitted light of the yellow-green phosphor combination is 90-115 nm.

Preferably, the packaging part further comprises a base material and a light diffuser, the base material is silica gel or resin, and the light diffuser is one of nano-scale titanium oxide, aluminum oxide or silicon oxide.

Preferably, the color of the light emitted by the light source module is located in a quadrilateral area surrounded by four vertices D1 (0.3991, 0.4012), D2 (0.3722, 0.3843), D3 (0.3658, 0.3550), and D4 (0.3885, 0.3688) on the CIE1931 color space.

Preferably, the color of the light emitted by the light source module is located in the ellipse with a center point x0=0.3805, y0=0.3768, a major axis a=0.00313, a minor axis b=0.00134, an inclination angle θ=54.0°, and SDCM=5.0 on the CIE1931 color space.

Preferably, when the illumination of the emitted light of the light source module is 500 lux, the CS value is ≥ 0.34.

Preferably, the color rendering index of the light emitted by the light source module is CRI≥90.0, and R9≥85.0.

The present invention also provides a lighting device, comprising the light source module.

The light source module provided by the present invention provides an LED neutral white light (4000K) light source with high light efficiency, high CS value and high color rendering by controlling the proportion of luminous energy in the 495-560nm wavelength region which has the greatest influence on the CS value in the total luminous energy. This high CS value spectrum is particularly suitable for people to concentrate on learning and working under the same illumination.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a light source module according to a preferred embodiment of the present invention;

FIG2 is a schematic diagram of the spectrum characteristics of a light source module according to a preferred embodiment of the present invention;

FIG3 is a CIE1931 color coordinate diagram of preferred embodiments 1 to 8 of the present invention;

FIG4 is a spectrum diagram of emitted light of a preferred embodiment 1 of the present invention;

FIG5 is a spectrum diagram of emitted light of a preferred embodiment 2 of the present invention;

FIG6 is a spectrum diagram of emitted light of a preferred embodiment 3 of the present invention;

FIG7 is a spectrum diagram of emitted light of a preferred embodiment 4 of the present invention;

FIG8 is a spectrum diagram of emitted light of a preferred embodiment 5 of the present invention;

FIG9 is a spectrum diagram of emitted light of a preferred embodiment 6 of the present invention;

FIG10 is a spectrum diagram of emitted light of a preferred embodiment 7 of the present invention;

FIG. 11 is a graph showing the emission light spectrum of the preferred embodiment 8 of the present invention.

Detailed ways

A light source module and a lighting device provided by the present invention are further described in detail below in conjunction with the accompanying drawings and some preferred embodiments consistent with the present invention.

As shown in FIG1 , the light source module L1 provided by the present invention is a light source product, which can be applied to a lighting device (not shown) to provide daily lighting. The lighting device can be a table lamp, a chandelier, a ceiling lamp, a downlight, a spotlight, or other types of lamps. The lighting device includes a light source module L1 and a power module that provides the light source module L1 with the power required for operation. The lighting device can also be provided with a controller, a heat dissipation device, and a light distribution component, etc., according to the function and requirements of the specific lamp. The controller can be used to adjust the light color, light intensity, etc. of the irradiated light emitted by the light source module L1, and the light distribution component can be a lampshade, a lens, a diffusion element, a light guide, etc.

A specific embodiment of the light source module L1 of the present invention is a mixed white light LED package chip, which can be an LED chip with a general SMD package structure or a COB package structure as shown in Figure 1. The light source module L1 includes at least a first light-emitting element 1 and a packaging portion 2 covering the first light-emitting element.

The first light-emitting element 1 is a blue LED chip, which is directly excited by semiconductor materials to emit light, and its peak wavelength is between 435 and 465 nm, and the light color is blue. Here, we call the light emitted by the first light-emitting element 1 the first color light. In another preferred embodiment, a blue LED chip with a peak wavelength of 435 to 465 nm can also be used. LED chips (LEDChip) include forward-mounted or reverse-mounted, and a single LED chip or multiple LED chips are connected in series, parallel, or series-parallel.

The packaging part 2 uses transparent silica gel or transparent resin as the base material 204, wherein the transparent resin refers to one of epoxy resin and urea resin. The base material 204 is mixed with a first additional luminous body 201, a second additional luminous body 202, and a third additional luminous body 203. The first additional luminous body 201 is a blue-green phosphor that receives part of the light emitted by the first light-emitting element 1 and converts it into a second color light with a peak wavelength of 485 to 520 nm and a half-width of 25 to 65 nm. The second additional luminous body 202 is a yellow-green phosphor combination including at least one yellow phosphor with a peak wavelength greater than 540 nm and at least one green phosphor with a peak wavelength less than 540 nm. The combined second additional luminous body 202 receives part of the light emitted by the first light-emitting element 1 and converts it into a third color light with a peak wavelength of 530 to 580 nm and a half-width of 60 to 115 nm, and the preferred half-width is 90 to 115 nm. The third additional light-emitting body 203 is a red or orange phosphor that receives part of the light emitted by the first light-emitting element 1 and converts it into a fourth color light with a peak wavelength of 605 to 645 nm and a half-width of 80 to 120 nm, and the preferred half-width is 80 to 100 nm. The packaging part 2 may also include a light diffuser, which may be one of nano-sized titanium oxide, aluminum oxide or silicon oxide. The above-mentioned various types of phosphors and light diffusers are mixed into the packaging substrate 204 and evenly distributed in the packaging substrate 204. The packaging substrate 204 mixed with phosphors covers the blue LED chip as the first light-emitting element 1 to form the packaging part 2.

The function of the additional light-emitting body in the light source module L1 is to receive part of the light emitted by the first light-emitting element 1 and convert it into light of other colors different from the first color. In this embodiment, the first color light, the second color light, the third color light and the fourth color light are mixed to form the emission light of the light source module L1. The emission light of the light source module L1 is white light in the interval surrounded by the points at the correlated color temperature of 4000±280K and the distance duv=-0.006 to 0.006 from the blackbody locus on the CIE1931 color space.

Below we explain the various phosphors we use. For the convenience of description, we define the sum of the weights of the above-mentioned blue-green phosphor, yellow-green phosphor combination, and red or orange phosphor as the total phosphor weight. The total phosphor weight accounts for 25-50% of the packaging part 2. The weight of the packaging part 2 is the total weight of the packaging substrate 204 after the phosphor and light diffusing agent are mixed.

The blue-green phosphor as the first additional luminous body 201 accounts for 15.0-40.0% of the total phosphor weight, and can be any one of the following phosphors, or a mixture of two or more of the following phosphors. The specific types of phosphors are as follows (in the present invention, x represents the molar ratio):

(a) Nitrogen oxide, Eu ²⁺ as activator

Chemical composition formula: (Ba,Ca) _1-x Si ₂ N ₂ O ₂ :Eu _x

Where x = 0.005 to 0.200;

(b) Ga-doped garnet phosphor, Eu ²⁺ as activator

General chemical formula: Ga-LuAG:Eu;

(c) Silicate phosphor, Eu ²⁺ as activator

General chemical formula: Ba ₂ SiO ₄ :Eu.

The yellow-green phosphor combination as the second additional light-emitting body 202 accounts for 25.0-55.0% of the total phosphor weight. Generally speaking, there is no clear definition for yellow and green phosphors. The two basically have the same chemical formula, and the only difference is the molar ratio of the components. The feature of the present application is that two phosphors with different peak wavelengths are selected for combination in the 500-580nm band, one of which has a peak wavelength greater than 540nm and less than 580nm, which we call yellow phosphor, and the other phosphor has a peak wavelength less than 540nm and greater than 500nm, which we call green phosphor. Of course, in other preferred embodiments, more types of phosphors can be selected for mixing, but they need to include what we call yellow phosphor and what we call green phosphor. The specific yellow phosphor/green phosphor can be any one of the following phosphors or a mixture of two or more:

(a) Garnet structure phosphor, Ce ³⁺ as activator

Chemical composition formula: (M4) _3-x (M5) ₅ O ₁₂ :Ce _x

Wherein M4 is at least one element selected from Y, Lu, Gd and La, M5 is at least one element selected from Al and Ga, and x is 0.005 to 0.200;

(b) Silicate system phosphor, Eu ²⁺ as activator

Chemical composition formula: (M6) _2-x SiO ₄ ：Eu _x

or (Ba,Ca,Sr) _2-x (Mg,Zn)Si ₂ O ₇ :Eu _x

Wherein M6 is at least one element selected from Mg, Sr, Ca and Ba, and x is 0.01 to 0.20;

(c) Nitrogen oxide phosphor (sialon β-SiAlON), Eu ²⁺ as activator

Chemical composition formula: Si _b Al _c O _{d Ne} :Eu _x

Where x = 0.005 to 0.400, b + c = 12, d + e = 16;

(d) Aluminate system phosphor, Eu ²⁺ as activator

Chemical composition formula: (Sr,Ba) _2-x Al ₂ O ₄ :Eu _x

or (Sr,Ba) _4-x Al ₁₄ O ₂₅ ：Eu _x

Where x=0.01~0.15.

The red or orange phosphor as the third additional luminous body 203 accounts for 10.0-40.0% of the total phosphor weight, and can be any one of the following phosphors, or a mixture of two or more of the following phosphors. The specific types of phosphors are as follows (in the present invention, x represents the molar ratio):

(a) Nitride red powder with 1113 crystal structure, Eu ²⁺ as activator

Chemical composition formula: (M1) _1-x AlSiN ₃ :Eu _x

Wherein M1 is at least one element selected from Ca, Sr and Ba, and x is 0.005 to 0.300;

(b) Nitride red powder with 258 crystal structure, Eu ²⁺ as activator

Chemical composition formula: (M2) _2-x Si ₅ N ₈ ：Eu _x

Wherein M2 is at least one element selected from Ca, Sr, Ba and Mg, and x is 0.005 to 0.300;

(c) Nitride oxide phosphor (sialon α-SiAlON), Eu ²⁺ as activator

Chemical composition formula: ((M3) _1-a ) _x Si _b Al _c O _d N _e :Eua

Wherein M3 is at least one element selected from Li, Na, K, Rb, Cs, Sr, Ba, Sc, Y, La, and Gd, x=0.15-1.5, a=0.005-0.300, b+c=12, d+e=16;

(d) Silicate phosphor, Eu ²⁺ as activator

Chemical composition formula: (Sr,Ba) _3-x Si ₅ O ₅ :Eu _x

Where x=0.005~0.300.

The above are the types of phosphors that can be selected. In this application, we provide 8 specific embodiments, in which a total of 10 phosphors are selected. The parameters and chemical formulas of the phosphors selected in the embodiments are shown in the table below. For ease of description, we define codes for the phosphors in Table 1. In the subsequent embodiment descriptions, we will use the codes to describe them, and no longer describe the peak values and chemical formulas of the phosphors in detail in each embodiment.

Table 1

The parameters in the above table are all for this type of phosphor, x and y represent the coordinate values of the light color of the phosphor in the CIE1931 color space, Peak represents the peak wavelength, and Hw represents the half width. The above values are the actual values of the phosphor used in the embodiment, and are not limitations of the present invention, because in actual production, due to the difference in phosphor purity and particle size, its peak wavelength and half width may deviate slightly from the above data, and this deviation value is generally controlled between ±5nm. It should be considered that other solutions within this range are equivalent to the above phosphor.

Table 2 shows 8 embodiments of the present application, as well as the types of phosphors used in each embodiment and the weight of each type of phosphor, wherein the yellow-green powder ratio refers to the ratio of the mixed yellow powder and green powder to the total phosphor weight, and the total phosphor ratio refers to the ratio of the total phosphor weight to the total weight of the packaging part 2 after all four phosphors and the packaging substrate 204 are mixed. In these embodiments, the packaging substrate 204 is transparent silica gel and weighs 10 g.

Table 2

The weights of the phosphors in the examples in Table 2 are all data when we make sample chips. In actual mass production, the weights will be slightly different due to different phosphor batches, but their basic proportions are within a fixed range. From Table 2, it can be seen that the red phosphor as the third additional luminous body 203 accounts for 22.9% to 35.3% of the total phosphor weight. Considering that other types of phosphors can also be used, this application believes that the third additional luminous body 203 accounts for 10% to 40% of the total phosphor weight. The yellow-green phosphor combination as the second additional luminous body 202 in Table 2 accounts for 40.2% to 54.7% of the total phosphor weight. This application believes that the second additional luminous body 202 accounts for 35.0% to 55.0% of the total phosphor weight. Further consideration is that the proportion of other phosphors can be expanded to 25.0% to 55.0%. In Table 2, the blue-green phosphor as the first additional luminous body 201 accounts for 17.6% to 28.4% of the total phosphor weight. In this application, it is considered that the first additional luminous body 201 accounts for 15.0% to 30.0% of the total phosphor weight. Further consideration is given to the fact that the proportion of other phosphors can be expanded to 15.0% to 40.0%. These phosphors can be mixed with transparent silica gel and coated on the LED chip, or they can be remote phosphors set at a position far away from the chip, or part of them can be mixed with the packaging glue and part of them can be set outside. This application does not limit this.

Refer to the table above for a detailed description of each implementation.

In Example 1, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=450nm. 1.45g of red phosphor codenamed R630 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y550 and a green phosphor codenamed G-Ga535, wherein 2.23g of yellow phosphor and 0.86g of green phosphor are used, for a total of 3.09g. 1.80g of blue-green phosphor codenamed BG490 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 4, and the specific luminescence characteristics are shown in Table 3.

In Example 2, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=450nm. 1.58g of red phosphor codenamed R630 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y550 and a green phosphor codenamed G-Ga535, wherein 0.90g of yellow phosphor and 1.98g of green phosphor are used, for a total of 2.88g. 1.50g of blue-green phosphor codenamed BG490 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 5, and the specific luminescence characteristics are shown in Table 3.

In Example 3, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=455nm. 1.92g of red phosphor codenamed R640 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y565 and a green phosphor codenamed G-L535, wherein 1.37g of yellow phosphor and 1.57g of green phosphor are used, for a total of 2.94g. 1.30g of blue-green phosphor codenamed BG490 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 6, and the specific luminescence characteristics are shown in Table 3.

In Example 4, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=450nm. 2.05g of red phosphor codenamed R640 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y565 and a green phosphor codenamed G-L535, wherein 1.27g of yellow phosphor and 2.48g of green phosphor are used, for a total of 3.75g. 1.25g of blue-green phosphor codenamed BG490 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 7, and the specific luminous properties are shown in Table 3.

In Example 5, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=450nm. 1.73g of red phosphor codenamed R650 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y550 and a green phosphor codenamed G-L535, wherein 2.17g of yellow phosphor and 1.37g of green phosphor are used, for a total of 3.54g. 1.20g of blue-green phosphor codenamed BG490 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 8, and the specific luminescence characteristics are shown in Table 3.

In Example 6, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=445nm. 1.80g of red phosphor codenamed R650 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y565 and a green phosphor codenamed G-Ga535, wherein 0.70g of yellow phosphor and 1.35g of green phosphor are used, for a total of 2.05g. 1.25g of blue-green phosphor codenamed BG490 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 9, and the specific luminescence characteristics are shown in Table 3.

In Example 7, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=455nm. 2.50g of red phosphor codenamed R630 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y550 and a green phosphor codenamed G-Ga535, wherein 2.33g of yellow phosphor and 2.20g of green phosphor are used, for a total of 4.53g. 1.50g of blue-green phosphor codenamed BG490 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 10, and the specific luminescence characteristics are shown in Table 3.

In Example 8, the first light-emitting element 1 in the light source module L1 is a blue light LED chip with Peak=450nm. 1.90g of red phosphor codenamed R640 is used as the third additional light-emitting body 203. The second additional light-emitting body 202 is composed of a yellow phosphor codenamed Y550 and a green phosphor codenamed G-Ga535, wherein 2.16g of yellow phosphor and 0.90g of green phosphor are used, for a total of 3.06g. 1.24g of blue-green phosphor codenamed BG500 is used as the first additional light-emitting body 201. The above-mentioned phosphors are put into transparent silica gel, mixed thoroughly in a blender, coated on the blue light LED chip, and dried to remove bubbles to obtain a neutral white light LED chip, whose spectrum is shown in Figure 11, and the specific luminescence characteristics are shown in Table 3.

table 3

Table 3 lists the luminous properties of the light source module L1 in Examples 1-8, where x and y represent the coordinate values of the light color of the light emitted by the light source module L1 on the x and y axes in the CIE1931 color coordinate system, CCT is the color temperature, duv represents the distance and direction of the color deviation from the Planckian locus in the color coordinate system, and CRI and R9 are the color rendering indexes. The CS value of 500lux in this application represents the CS value of the light emitted by the light source module L1 at an illumination of 500lux, and the specific calculation formula is as follows:

in

if/> _CLA = 1548 × {∫Mc(λ)P(λ)dλ}, if/>

in

P ₀ (λ): spectral distribution of light source

P(λ): corresponds to the spectral distribution of the light source of 500 lux

Mc(λ): Melanin sensitivity curve corrected by lens transmittance

S(λ): S-type cone cell sensitivity curve

mp(λ): macular pigment transmittance

V(λ): Luminous efficiency function for photopic vision

V'(λ): luminous efficiency function of dark vision

The calculation formula is based on the mathematical model of human rhythmic photoconduction that has been published by LRC.

From Table 3, we can see that the CS value of the emitted light of the light source module L1 of all embodiments at an illumination of 500 lux is greater than 0.34, and its color rendering index meets CRI≥90.0, R9≥85.0. We mark the luminous light colors in each embodiment on the CIE1931 color coordinate system, as shown in Figure 3, the light colors of each embodiment fall near the black body locus of the correlated color temperature 4000±280K, and the distance from the black body locus BBL is less than 0.006, that is, duv is in the range of -0.006 to 0.006. And all points fall within the quadrilateral area surrounded by the four vertices of point D1 (0.3991, 0.4012), point D2 (0.3722, 0.3843), point D3 (0.3658, 0.3550), and point D4 (0.3885, 0.3688), that is, area 1 shown in the figure. After conducting user experiments on these embodiments later, we found that embodiments 1, 2, 3, 4, 6, and 7 have better effects. From Figure 3, we can see that these points all fall into the illustrated area 2, which is an ellipse with a center point x0=0.3805, y0=0.3768, a major axis a=0.00313, a minor axis b=0.00134, an inclination angle θ=54.0°, and SDCM=5.0.

The reason why these embodiments we provide can achieve higher CS values is mainly due to the energy distribution of the emitted light at different wavelengths, and these characteristics can be reflected through their spectral characteristics. Figure 2 is a schematic spectrum diagram that best reflects the spectral characteristics of the light emitted by the light source module L1 of the present application. We will illustrate the spectral characteristics of the present application based on Figure 2. As can be seen from Figure 2, the spectrum of the emitted light of the light source module L1 is continuously distributed in the visible light range of 380 to 780 nm, that is, each point in 380 to 780 nm has a certain energy distribution, which can ensure that the spectrum has better display. For the convenience of subsequent description, here we first define the relative deviation value ΔI of the spectral intensity between two adjacent points in a spectrum. ΔI represents the change in the spectral emphasis of two adjacent points in the spectrum, which is expressed as the slope of the line between two adjacent points in the spectrum diagram. The specific formula is Where Intensit(i) and Intensit(i+1) respectively represent the spectral intensity of two adjacent points in the spectrum with a wavelength difference of step size I. For two adjacent points on the spectrum, theoretically, the points on the line can be infinitely close, but according to the custom in the industry, two adjacent points generally refer to two points in the spectrum graph separated by a certain wavelength. The wavelength of the interval is called step size I. Usually, everyone uses 5nm as the step size. For example, in the spectrum graph, the two points of 600nm and 605nm are called adjacent points. Therefore, the relative deviation value ΔI of the spectral intensity of two adjacent points is a value that characterizes the smoothness of the spectrum, and the shorter the step size, the more accurately it can represent the change of the spectrum, so the value range of the step size I can be defined as 1nm≤I≤5nm. Of course, in this embodiment, we still use the conventional definition and define two points separated by 5nm as adjacent points.

The spectrum in FIG2 mainly includes the first peak P1, the second peak P2, the peak valley V1 and a stable distribution interval Z.

The first peak P1 is located in the wavelength region of 435-465nm. Since the light source module L1 uses the first light-emitting element 1 blue light LED chip as the excitation light source, although a large part of the light emitted by the blue light LED chip is converted in wavelength through the additional light-emitting body, there is still a part of the energy that has not been converted. This energy forms the first peak in the wavelength region of 435-465nm. This P1 point may be the same as the peak wavelength of the blue light LED chip, because the main source of energy for this peak is the first light-emitting element 1, but the light converted by each additional light-emitting body may also have some energy in this wavelength band. After the two are mixed, this first peak P1 does not necessarily completely coincide with the peak wavelength position of the original first light-emitting element 1 blue light LED chip, and may drift slightly, but it is still in the wavelength region of 435-465nm.

The second peak P2 is located in the wavelength region of 605-645nm, and the energy of the second peak P2 is provided by the red phosphor of the third additional luminous body 203 receiving part of the light emitted by the blue LED chip of the first light-emitting element 1 and converting it into red light. The ratio of the spectral intensity of the second peak P2 to the spectral intensity of the first peak P1 is between 70% and 130%, preferably 80% to 110%. In FIG2 , the second peak P2 is slightly lower than the first peak P1, and the ratio is close to 95%, while in Examples 2, 4, 5, and 7, the second peak P2 is significantly higher than the first peak P1, and the ratio between the two is greater than 100%.

The peak valley V1 is located in the wavelength region of 455 to 485 nm. In order to ensure that the energy in this region is not too low, the ratio of the spectral intensity of the peak valley V1 to the spectral intensity of the first peak should be greater than or equal to 25%, and more preferably 30 to 60%. This part of the energy is provided by the blue-green phosphor of the first additional light-emitting body 201 receiving part of the light emitted by the blue LED chip of the first light-emitting element 1 and converting it into blue-green. The addition of the blue-green phosphor is to ensure that this part of the energy is not too low. However, even if the height of the valley bottom is guaranteed, the width of the peak valley V1 also affects the energy distribution. In order to achieve the effect required by this application, we require that the width of the peak valley V1 in the long-wave direction should be less than or equal to 30nm. The width of the peak valley V1 in the long-wave direction is represented as the distance W from the peak valley V1 to point A in Figure 2, where point A is the point close to the peak valley V1 in the first two adjacent points when ΔI≤2% appears in the long-wave direction from the peak valley V1 position. We call it the end point A of the peak valley in the long-wave direction. Before point A, ΔI is large and the slope is large, showing a valley state. After point A, ΔI becomes smaller and the spectrum rises relatively gently. The width W of the peak valley V1 in the long-wave direction is equal to the wavelength difference between point A and the peak valley V1.

The stable distribution interval Z is the wavelength region of 495 to 560 nm. It is called the stable distribution interval because the spectral intensity changes less in this interval. The spectral curve of this section is almost platform-shaped, in which the ΔI of any two adjacent points is no more than 1.5%, and preferably no more than 0.8%. The ratio of the spectral intensity of any point to the spectral intensity of the first peak P1 is between 60 and 80%. Figure 2 is an ideal spectrum diagram of the present application, so point A is exactly located at the starting position of the stable distribution interval Z. In a specific embodiment, point A may fall into the stable distribution interval Z, or may be outside the stable distribution interval Z. The present application does not limit this. The energy in the stable distribution interval Z is provided by the yellow-green phosphor combination of the second additional light-emitting body 202 after receiving part of the light emitted by the blue LED chip of the first light-emitting element 1. FIG. 2 shows an ideal state. The overall fluctuation of the stable distribution interval Z is very small. However, since the yellow-green phosphor combination is a mixture of two phosphors, it is possible that a small peak will appear in this interval, as shown in the spectra of Examples 5, 6, 7, and 8. However, as long as ΔI is within the range we have defined, it will not have much impact on the result, and the desired CS value can still be achieved.

Table 4 lists the characteristic values of each spectrum of Examples 1-8, wherein P1 wavelength, P2 wavelength, and V1 wavelength refer to the wavelengths of the first peak P1, the second peak P2, and the peak valley V1, respectively; P2 energy ratio refers to the ratio of the spectral intensity of the second peak P2 to the spectral intensity of the first peak P1; V1 energy ratio refers to the ratio of the spectral intensity of the peak valley V1 to the spectral intensity of the first peak P1; the minimum value of the Z interval energy ratio refers to the minimum value of the ratio of the spectral intensity of any point in the stable distribution interval Z to the spectral intensity of the first peak P1; the maximum value of ΔI in the Z interval refers to the maximum value of the ΔI values of any two adjacent points in the stable distribution interval Z; and W refers to the wavelength difference between the end point A of the long-wave direction of the peak valley V1 and the peak valley V1.

Table 4

These characteristic values all fall within the range of the spectral characteristics described above. It is precisely because of the existence of these characteristics that Examples 1-8 having these spectral characteristics can achieve the luminescence characteristics of high CS value and high display in Table 3.

The above description of the preferred embodiments of the present invention is for illustration and description, and is not intended to be exhaustive or limited to the present invention in the specific form disclosed. Obviously, many modifications and changes may be made, which may be obvious to those skilled in the art and should be included in the scope of the present invention defined by the appended claims.

Claims (19)

1. A light source module is characterized by comprising a first light-emitting element and a packaging part covered on the first light-emitting element,

the first light-emitting element emits first color light with the peak wavelength of 435-460 nm;

the package portion includes:

the first additional light-emitting body is arranged to receive part of light rays emitted by the first light-emitting element and convert the light rays into second color light with the peak wavelength of 485-520 nm;

the second additional light-emitting body is arranged to receive part of light rays emitted by the first light-emitting element and convert the light rays into third color light with the peak wavelength of 530-580 nm;

a third additional light emitter arranged to receive part of the light emitted by the first light emitting element and convert it into fourth color light having a peak wavelength in the range of 605 to 640 nm,

the first color, the second color, the third color and the fourth color are mixed to form the emitted light of the light source module, the emitted light is neutral white light, namely, the emitted light is positioned in an interval surrounded by a point of a distance duv= -0.006 of a correlated color temperature 4000 + -280K and a blackbody locus on a CIE1931 color space,

the spectrum of the emitted light is continuously distributed in the visible light range of 380-780 nm, the spectrum intensity relative deviation value delta I of two adjacent points in the spectrum is defined,

wherein, the Interit (I) and the Interit (i+1) respectively represent the spectrum intensities of two points with the wavelength difference of step length I in the spectrum, I is more than or equal to 1nm and less than or equal to 5nm,

the emission spectrum comprises two peaks, a peak valley and a stable distribution interval:

the first peak is located in a 435-460 nm wavelength region;

the second peak is located in a 605-640 nm wavelength region, and the ratio of the spectral intensity of the second peak to the spectral intensity of the first peak is 70% -130%;

the peak valley is positioned in a wavelength region of 455-4815 nm, the ratio of the spectral intensity of the peak valley to the spectral intensity of the first peak is greater than or equal to 25%, the width of the peak valley in the long wave direction is less than or equal to 30nm, the end point in the direction of the peak Gu Changbo is defined as the point which is close to the peak valley in two adjacent points, the first delta I which appears from the position of the peak valley in the long wave direction is less than or equal to 2%, and the width of the peak valley in the long wave direction refers to the wavelength difference between the end point in the direction of the peak Gu Changbo and the peak valley;

the stable distribution interval is a 495-560 nm wavelength region, the ratio of the spectral intensity of any point in the stable distribution interval to the spectral intensity of the first peak is 60-80%, and the delta I of any two adjacent points is not more than 1.5%.

2. The light source module of claim 1, wherein a ratio of the spectral intensity of the second peak to the spectral intensity of the first peak is between 80% and 110%.

3. The light source module of claim 1, wherein a ratio of the spectral intensity of the peak valley to the spectral intensity of the first peak is between 30% and 60%.

4. The light source module of claim 1, wherein Δi of any two adjacent points in the stable distribution interval is not greater than 0.8%.

5. The light source module of claim 1, wherein the first light emitting element is a blue LED with a peak wavelength of 435-460 nm; the first additional light emitter is blue-green fluorescent powder with the peak wavelength of 485-520 nm and the half width of 25-65 nm; the second additional light emitting body is a yellow-green fluorescent powder combination comprising yellow fluorescent powder and green fluorescent powder, wherein the yellow fluorescent powder combination comprises at least one yellow fluorescent powder with the peak wavelength being more than 540nm and at least one green fluorescent powder with the peak wavelength being less than 540, the peak wavelength of the yellow-green fluorescent powder combination is 530-580 nm, and the half width is 60-115 nm; the third additional light-emitting body is red or orange fluorescent powder with the peak wavelength of 605-640 nm and the half width of 80-120 nm.

6. The light source module of claim 5, wherein a sum of weights of the blue-green phosphor, the yellow-green phosphor combination, the red or orange phosphor is defined as a total phosphor weight, and a ratio of the total phosphor weight in the package portion is 25.0% -50.0%.

7. The light source module of claim 6, wherein the blue-green phosphor is one or more of the following phosphors:

(a) Nitrogen oxides, eu ²⁺ As an activator

The chemical composition formula: (Ba, ca) _1-x Si ₂ N ₂ O ₂ :Eu _x

Wherein x=0.005 to 0.200;

(b) Ga doped garnet fluorescent powder, eu ²⁺ As an activator

The chemical composition formula: ga-LuAG, eu;

(c) Silicate fluorescent powder, eu ²⁺ As an activator

The chemical composition formula: ba (Ba) ₂ SiO ₄ :Eu。

8. The light source module of claim 7, wherein the blue-green phosphor is present in an amount of 15.0-40.0% by weight of the total phosphor.

9. The light source module of claim 6, wherein the yellow/green phosphor is one or more of the following phosphors:

(a) Garnet-structured phosphor powder, ce ³⁺ As an activator

The chemical composition formula: (M4) _3-x( M5) ₅ O ₁₂ :Ce _x

Wherein M4 is at least one element of Y, lu, gd and La, M5 is at least one element of Al and Ga, and x=0.005-0.200;

(b) Silicate system phosphor, eu ²⁺ As an activator

The chemical composition formula: (M6) _2-x SiO ₄ ：Eu _x

Or (Ba, ca, sr) _2-x (Mg,Zn)Si ₂ O ₇ :Eu _x

Wherein M6 is at least one element of Mg, sr, ca, ba, and x=0.01 to 0.20;

(c) Nitrogen oxide fluorescent powder (SiAlON beta-SiAlON), eu ²⁺ As an activator

The chemical composition formula: si (Si) _b Al _c O _d N _e ：Eu _x

Wherein x=0.005 to 0.400, b+c=12, d+e=16;

(d) Aluminate system phosphor, eu ²⁺ As an activator

The chemical composition formula: (Sr, ba) _2-x Al ₂ O ₄ :Eu _x

Or (Sr, ba) _4-x Al ₁₄ O ₂₅ ：Eu _x

Wherein x=0.01 to 0.15.

10. The light source module of claim 9, wherein the yellow-green phosphor composition comprises 25.0% -55.0% by weight of the total phosphor.

11. The light source module of claim 6, wherein the red or orange phosphor is one or more of the following phosphors:

(a) Nitride red powder with 1113 crystal structure, eu ²⁺ As an activator

The chemical composition formula: (M1) _1-x AlSiN ₃ :Eu _x

Wherein M1 is at least one element of Ca, sr and Ba, and x=0.005-0.300;

(b) Nitride red powder with 258 crystal structure, eu ²⁺ As an activator

The chemical composition formula: (M2) _2-x Si ₅ N ₈ ：Eu _x

Wherein M2 is at least one element of Ca, sr, ba, mg, and x=0.005 to 0.300;

(c) Nitrogen oxide phosphor (SiAlON), eu ²⁺ As an activator

The chemical composition formula: ((M3) _1-a ) _x Si _b Al _c O _d N _e :Eu _a

Wherein M3 is at least one element of Li, na, K, rb, cs, sr, ba, sc, Y, la, gd, x=0.15 to 1.5, a=0.005 to 0.300, b+c=12, d+e=16;

(d) Silicate fluorescent powder, eu ²⁺ As an activator

The chemical composition formula: (Sr, ba) _3-x Si ₅ O ₅ :Eu _x

Wherein x=0.005 to 0.300.

12. The light source module of claim 11, wherein the red or orange phosphor is present in an amount of 10.0% -40.0% by weight of the total phosphor.

13. The light source module of claim 6, wherein the half width of the emitted light of the yellow-green phosphor combination is 90-115 nm.

14. The light source module of claim 6, wherein the package further comprises a base material and a light diffusing agent, the base material is silica gel or resin, and the light diffusing agent is one of nano-sized titanium oxide, aluminum oxide or silicon oxide.

15. The light source module of any one of claims 1-14, wherein the light color of the light emitted by the light source module is located in a quadrilateral area surrounded by four vertices D1 (0.3991,0.4012), D2 (0.3722,0.3843), D3 (0.3658,0.3550), and D4 (0.3885,0.3688) on CIE1931 color space.

16. The light source module of claim 15, wherein the light source module emits light having a color within an ellipse having a center point x0= 0.3805, y0= 0.3768, a major axis a= 0.00313, a minor axis b= 0.00134, a tilt angle θ=54.0°, sdcm=5.0 in CIE1931 color space.

17. The light source module of any one of claims 1-14, wherein the CS value is greater than or equal to 0.34 when the light emitted by the light source module is at an illuminance of 500 lux.

18. The light source module of any one of claims 1-14, wherein the color rendering index CRI of the emitted light of the light source module is greater than or equal to 90.0 and R9 is greater than or equal to 85.0.

19. A lighting device, comprising: a light source module according to any one of claims 1 to 18.