CN102777778A - Light emitting device, bulb and lighting method thereof - Google Patents

Abstract

The invention discloses a light-emitting device, a lighting method and a bulb. The light engine comprises a circuit board, a blue light emitting diode and a red light emitting diode, wherein the blue light emitting diode and the red light emitting diode are arranged on the circuit board. The wavelength conversion element at least covers the blue light-emitting diode. The wavelength conversion element is used for converting the wavelength of a part of light emitted by the light engine and the wavelength of the wavelength conversion element to generate wavelength conversion light, the wavelength conversion light and light which is emitted by the light engine and is not subjected to wavelength conversion form white light of black body radiant ray color along a CIE-1931 chromaticity diagram after light mixing, and the color temperature of the white light falls between 2580K and 3220K. The light-emitting device of the invention can effectively improve the whole light-emitting efficiency.

Description

Lighting device, light bulb and lighting method thereof

technical field

The invention relates to a light emitting device, in particular to a light emitting device with low color temperature.

Background technique

A light emitting diode (Light Emitted Diode, LED) is a semiconductor component that mainly converts electrical energy into light energy through semiconductor compounds to achieve the effect of light emission. Therefore, it has the characteristics of long life, high stability and low power consumption. In the early days, it was mainly used as lights for indicator lights, traffic signals or signboards. With the emergence of white light-emitting diodes, it began to be used in lighting equipment.

The traditional manufacturing method of white light-emitting diodes is to coat a yellow Yttrium Aluminum Garnet (YAG) phosphor layer on a blue light-emitting diode chip. The yellow phosphor layer is excited by a part of the blue light emitted by the blue light-emitting diode to generate a wavelength-converted light, and the wavelength-converted light is mixed with the other part of the unconverted light emitted by the blue light-emitting diode that has not undergone wavelength conversion with the yellow phosphor to produce white light.

However, the blue light of the white light-emitting diode made of the blue light-emitting diode chip and the yellow phosphor powder accounts for most of its light-emitting spectrum, so that the white light-emitting diode emits a cool white light with a relatively high color temperature.

Traditionally, in order to improve the problem of high color temperature of white light emitting diodes, red phosphor powder is added to the phosphor layer of the above white light emitting diodes. The red phosphor is excited by blue light to generate red light, and after the red light is mixed with the original white light with high color temperature, warm white light with lower color temperature can be produced.

However, since the yellow phosphor and the red phosphor are difficult to mix evenly, the problem of uneven light mixing of the white light emitting diode arises. At the same time, part of the light emitted by the blue light-emitting diode is used to excite the yellow phosphor and the red phosphor, so that the overall luminous efficiency decreases, and the light conversion efficiency of the yellow phosphor and the red phosphor decreases with the increase in use time, so when used for a period of time After that, it is easy to have color shift.

Contents of the invention

In view of the prior art, an object of the present invention is to provide a light emitting device capable of emitting a warm white light with a low color temperature.

Another object of the present invention is to provide a lighting method for generating a warm white light with a low color temperature.

Another object of the present invention is to provide a light bulb for emitting a warm white light with a low color temperature.

To achieve the above purpose, the light emitting device of the present invention includes a light engine and at least one wavelength conversion element. The light engine includes a circuit board, a blue light emitting diode and a red light emitting diode, and the blue light emitting diode and the red light emitting diode are arranged on the circuit board. The wavelength conversion element at least covers the blue light emitting diode. A part of the light emitted by the light engine undergoes wavelength conversion with the wavelength conversion element to generate a wavelength-converted light, and the wavelength-converted light mixes with a non-wavelength-converted light emitted by the light engine to form a black body radiation along the CIE-1931 chromaticity diagram The color temperature of white light falls between 2580K and 3220K.

In order to achieve another object of the present invention, the lighting method of the present invention includes: lighting a light engine, causing the light engine to emit a light, and the luminous light color of the light falls on the CIE-1931 chromaticity coordinates (0.5745, 0.3370), ( 0.3420, 0.1796), (0.3075, 0.0839), (0.6581, 0.2518) enclosed range. When a phosphor is excited, a part of the light emitted by the light engine undergoes wavelength conversion with the phosphor to generate a wavelength-converted light, and the wavelength-converted light mixes with other non-wavelength-converted light emitted by the light engine to form an edge The white light of the black body radiation color of the CIE-1931 chromaticity diagram, the color temperature of the white light falls between 2580K and 3220K.

To achieve another object of the present invention, the light bulb of the present invention includes a light engine, a light wavelength conversion element, a cover body and a heat dissipation module. The light engine includes a circuit board, a first light-emitting element and a second light-emitting element, and the first and second light-emitting elements are arranged on the circuit board. The optical wavelength conversion element partially covers the light engine. The cover body is made of light-transmitting and light-scattering material; the heat dissipation module is combined with the cover body, so that the light engine and the light wavelength conversion element are placed between the cover body and the heat dissipation module. The light bulb emits a white light along the black body radiation color of the CIE-1931 chromaticity diagram, and the color temperature of the white light falls between 2580K and 3220K.

The beneficial effect of the present invention is that the present invention uses red light-emitting diodes as the red light source required in the warm white light spectrum, because the luminous efficiency of the red light emitted by the red light-emitting diodes is higher than that of using blue light in the prior art. The diode excites the red light generated by the red fluorescent powder, so the overall luminous efficiency can be effectively improved; moreover, the wavelength design of the red light emitting diode enables the light emitting device to obtain high color rendering.

Description of drawings

FIG. 1 is a partial cross-sectional view of a light emitting device according to a first embodiment of the present invention.

FIG. 2 is a top view of the light engine of the light emitting device according to the first embodiment of the present invention.

Fig. 3 is a cross-sectional view along line A-A of Fig. 2 .

FIG. 4 is a schematic diagram of a CIE-1931 chromaticity coordinate diagram corresponding to the emitted light color of the light engine of the present invention.

FIG. 5 is a schematic circuit diagram of the light emitting device of the present invention.

FIG. 6 is a schematic circuit diagram of the light emitting device of the present invention.

FIG. 7 is a schematic circuit diagram of the light emitting device of the present invention.

FIG. 8 is a schematic circuit diagram of the light emitting device of the present invention.

FIG. 9 is a schematic circuit diagram of the light emitting device according to the present invention.

Figure 10 is a schematic diagram of ANSI's white light classification method (ANSI C78.377-2008).

Fig. 11 is a schematic circuit diagram of the light emitting device of the present invention.

FIG. 12 is a cross-sectional view of a light emitting device according to a second embodiment of the present invention.

13 is a top view of the light engine of the light emitting device according to the second embodiment of the present invention.

FIG. 14 is a schematic diagram of the CIE-1931 chromaticity coordinate diagram of the luminous light color after mixing light corresponding to the second light-emitting element and the light wavelength conversion element of the present invention.

FIG. 15 is a schematic diagram of the light mixing method of the light emitting device of the present invention.

Wherein, the reference signs are explained as follows:

10, 20 Lighting device

110, 210 light engine

112, 222 circuit board

114, 224 The first light-emitting element

116, 226 The second light-emitting element

120, 220 Optical wavelength conversion components

130 heat dissipation module

140, 240 cover body

150, 250 Conductive joints

160, 260 drive circuit

170, 270 dimming controller

230 Heat sink

30 Lighting device

32 blue light-emitting diodes

34 red light emitting diode

36 phosphor powder

Lb blue light

Lb1 The first part of the blue light

Lb1 Part II Blu-ray Rays

Lr red light

Lt Ray

Detailed ways

Referring to FIG. 1 , it is a partial cross-sectional view of a light emitting device according to a first embodiment of the present invention. The lighting device 10 is a light bulb for indoor and outdoor lighting. The light emitting device 10 includes a light engine 110 , a light wavelength conversion element 120 , a heat dissipation module 130 , a cover 140 , a conductive joint 150 and a driving circuit 160 .

Referring to FIG. 2 and FIG. 3 , they are respectively a top view and a cross-sectional view along the line of FIG. 2A-A of the light engine of the first embodiment of the present invention. The light engine 110 includes a circuit board 112 , a plurality of first light emitting elements 114 and a plurality of second light emitting elements 116 . The circuit board 112 is a printed circuit board (PCB), on which circuit wires and solder pads (not shown) are disposed and electrically connected to the first light-emitting element 114 and the second light-emitting element 116 . The first light-emitting element 114 and the second light-emitting element 116 are arranged on the circuit board 112, the second light-emitting element 116 is arranged at the center of the circuit board 112, and the first light-emitting element 114 surrounds the second light-emitting element 116. In actual implementation It is not limited to this. The first light emitting element 114 is electrically connected to the second light emitting element 116 , wherein the first light emitting element 114 is a blue light emitting diode, and the second light emitting element 116 is a red light emitting diode.

Referring to FIG. 4 , it is a schematic diagram corresponding to the CIE-1931 chromaticity diagram of the luminous light color of the light engine of the present invention. The emission wavelength of each first light emitting element 114 is 445 to 465 nanometers (nm), and its chromaticity coordinates fall between point B1 and point B2 in the figure; the emission wavelength of each second light emitting element 116 is 600 to 640 nanometers, its The chromaticity coordinates fall between the points R1 and R2 in the figure.

Each of the first light emitting elements 114 has a blue light emitting diode die, the blue light emitting diode includes a junction, and the driving voltage of each of the first light emitting elements 114 ranges from 2.4 to 4.0 volts. Each second light emitting element 116 has a red light emitting diode die, and the red light emitting diode die includes a nodal plane, and the driving voltage range of each second light emitting element 116 is 1.8 to 3.0 volts. The first light emitting elements 114 and the second light emitting elements 116 are mixed in series and then connected in parallel, as shown in FIG. 5 . Moreover, the first light-emitting element 114 and the second light-emitting element 116 are electrically connected to the driving circuit 160, and the driving circuit 160 is electrically connected to an AC power supply ACV. In addition, the first light emitting element 114 and the second light emitting element 116 are respectively connected in series and then connected in parallel, as shown in FIG. 6 .

In addition, each first light emitting element 114 may also include a blue light emitting diode crystal grain, and the blue light emitting diode crystal grain includes a plurality of nodal planes, and the nodal planes are connected in series or in parallel through the interconnection of the semiconductor process; The light emitting element 116 further includes a red light emitting diode die, and the red light emitting diode die includes a plurality of nodes, and the nodes are all connected in series or in parallel by the interconnection method of the semiconductor process. The first light emitting elements 114 and the second light emitting elements 116 are mixed in series and then connected in parallel, as shown in FIG. 7 . In addition, the first light emitting element 114 and the second light emitting element 116 can be connected in series and then connected in parallel, as shown in FIG. 8 . The driving voltage of the first light-emitting element 114 with multiple nodal planes is M times that of the first light-emitting element 114 with a single nodal plane, where M is the number of nodal planes; the second light-emitting element with multiple nodal planes The driving voltage of 116 is N times that of the second light emitting element 116 with a single node plane, where N is the number of node planes.

In addition, each first light-emitting element 114 may include a plurality of blue light-emitting diode chips, each second light-emitting element 116 includes a plurality of red light-emitting diode chips, and the blue light-emitting diode chips and the red light-emitting diode chips are processed through the packaging process. To form a series or parallel connection, as shown in Figure 9. The driving voltage of the first light emitting element 114 comprising multiple blue light emitting diode crystal grains is M times that of the first light emitting element 114 comprising a single crystal grain, wherein M is the number of crystal grains; The driving voltage of the second light-emitting element 116 comprising a single grain is N times that of the second light-emitting element 116 comprising a single grain, where N is the number of grains.

Referring again to FIG. 3 , the optical wavelength conversion element 120 covers at least the first light-emitting element 114 , the optical wavelength conversion element 120 is a wavelength conversion element, and the wavelength conversion element includes a transparent shell and at least one phosphor. The light-transmitting shell is made of silicone, epoxy, a mixture of silicone and epoxy, polymer material or other light-transmitting materials. The phosphor is arranged in the light-transmitting housing, and the phosphor is yttrium aluminum garnet (YAG) phosphor, silicate (Silicate) phosphor, terbium aluminum garnet (TAG) phosphor, oxide (Oxide) Phosphor, nitride (Nitride) phosphor or aluminum oxide phosphor or other phosphors or materials that can provide light wavelength conversion. The chromaticity coordinates of the light after the phosphor powder of the light wavelength conversion element 120 is excited fall between points Y1 and Y2 in FIG. 4 .

A portion of the light emitted by the light engine 110 undergoes wavelength conversion with the optical wavelength conversion element 120 to generate a wavelength-converted light, and the wavelength-converted light mixes with a non-wavelength-converted light emitted by the light engine 110 to form a chromaticity along the CIE-1931 The black body radiation color of the coordinate diagram is in the warm white light area, and the color temperature of the warm white light falls between 2580K (Kelvin) and 3220K, as shown in area W in FIG. 4 .

With reference to Figure 10, it is a schematic diagram of ANSI's white light classification method (ANSI C78.377-2008). The white light color block is divided into eight color blocks, and their correlated color temperatures are 2700K, 3000K, 3500K, 4000K, 4500K, 5000K, 5700K and 6500K. The target correlated color temperature (Target CCT) and tolerance (tolerance) of each color block are 2725±145K, 3045±175K, 3465±245K, 3985±275K, 4503±243K, 5028±283K, 5665±355K and 6530±510K . Wherein the color temperature range of the warm white light W in this embodiment falls within the range of 2580K (2725-145K) to 3220K (3045+174K).

Referring again to FIG. 4 , the overlapping range of points Y1 and Y2 with points B1 and B2 corresponding to the light-emitting band of the first light-emitting element 114 and points R1 and point R2 corresponding to the light-emitting band of the second light-emitting element 116 is the maximum area of the light engine 110. Excellent luminous light color, the luminous light color falls on the coordinate point P1 (0.5745, 0.3370), point P2 (0.3420, 0.1796), point P3 (0.3075, 0.0839) and point P4 (0.6581, 0.2518) of CIE-1931 chromaticity coordinates within the enclosed area. In this way, the light emitted by the light engine 110 passes through the light wavelength conversion element 120 and then mixed to form a warm white light area W along the black body radiation color of the CIE-1931 chromaticity coordinate diagram, and the color temperature of the warm white light falls below Between 2580K and 3220K.

Referring again to FIG. 1 , the heat dissipation module 130 includes a hollow casing 132 , but not limited thereto. The housing 132 has a first side 134 and a second side 136 opposite to the first side 134 . The circuit board 112 is disposed on the first side 134 . The cover 140 is fixed on the first side 132 of the heat dissipation module 130 and covers the light engine 110 and the wavelength conversion element 120 , so that the light engine 110 and the light wavelength conversion element 120 are placed between the cover 140 and the heat dissipation module 130 . The cover 140 is used to prevent fine dust from adhering to the light wavelength conversion element 120 and water vapor from penetrating into the circuit board 112 to affect the lighting efficiency and service life of the light emitting device 10, wherein the cover 140 is made of light-transmitting and light-scattering materials .

The conductive connector 150 is disposed on the second side 134 of the heat dissipation module 130 for being screwed into a general light bulb socket to be electrically connected to an AC power source, wherein the conductive connector 150 is an E26 or E27 connector.

The driving circuit 160 is disposed inside the heat dissipation module 130 and electrically connected to the light engine 110 and the conductive connector 150 . Also refer to FIG. 11 , the drive circuit 160 converts the AC power ACV input through the conductive connector 150 into a DC power output, and the DC power makes the first light-emitting element 114 and the second light-emitting element 116 emit light.

In addition, the light emitting device 10 further includes a dimming controller 170, and the dimming controller 170 is electrically connected to the driving circuit 160 to control the conduction of the first light emitting element 114 of the light engine 110 and the plurality of second light emitting elements 116. , cut-off and light and dark brightness adjustment.

Therefore, the AC power output by the conductive joint 150 is converted into a stable DC power by the driving circuit 160 and then output to the light engine 110 to drive the light engine 110 to emit light. A part of the light emitted by the light engine 110 undergoes wavelength conversion with the optical wavelength conversion element 120 to generate a wavelength-converted light, and the wavelength-converted light mixes with a non-emitted wavelength-converted light emitted by the light engine 110 to form a chromaticity coordinate along the CIE-1931 The black body radiation color of white light in the figure has a color temperature between 2580K and 3220K.

Referring to FIG. 12 , it is a partial cross-sectional view of a light emitting device according to a second embodiment of the present invention. The light emitting device 20 includes a light engine 210 , a plurality of light wavelength conversion elements 220 , a heat sink 230 , a cover 240 , a conductive joint 250 and a driving circuit 260 .

Referring to FIG. 13 , it is a top view of the light engine according to the second embodiment of the present invention. The light engine 210 includes a circuit board 212 , a plurality of first light emitting elements 214 and a plurality of second light emitting elements 216 . The circuit board 212 is a printed circuit board. The first light emitting element 214 and the second light emitting element 216 are disposed on the circuit board 212 , and the first light emitting element 214 is electrically connected to the second light emitting element 216 .

Referring to FIG. 14 , it is a schematic diagram corresponding to the CIE-1931 chromaticity coordinate diagram of the luminous light color after the light mixing of the second light-emitting element and the light wavelength conversion element of the present invention. The first light-emitting element 214 is a blue light-emitting diode, and the light-emitting wavelength of the first light-emitting element 214 is 445 to 465 nanometers, and its chromaticity coordinates fall between points B1 and B2 in the figure. The second light-emitting element 216 is a red light-emitting diode. The light-emitting wavelength of the second light-emitting element 216 is 600-640 nanometers, and its chromaticity coordinates fall between points R1 and R2 in the figure.

Referring again to FIG. 12 , the light wavelength conversion elements 220 respectively cover the first light emitting elements 214 correspondingly. The light wavelength conversion element 220 is a wavelength conversion element, and the wavelength conversion element 220 includes a transparent shell and at least one phosphor. The light-transmitting shell is made of silicone, epoxy, a mixture of silicone and epoxy, polymer material or other light-transmitting materials. Phosphor powder is set in the light-transmitting shell or coated on the surface of the light-transmitting shell. The phosphor powder is yttrium aluminum garnet phosphor, silicate phosphor, terbium aluminum garnet phosphor, oxide phosphor, nitride Phosphor or aluminum oxide phosphor or other phosphors or materials that can provide light wavelength conversion. The chromaticity coordinates of the light after the phosphor powder in the light wavelength conversion element 220 is excited fall between points Y1 and Y2 in FIG. 14 .

A part of the light emitted by the first light-emitting element 212 of the light engine 210 undergoes wavelength conversion with the optical wavelength conversion element 220 to generate a wavelength-converted light, and the wavelength-converted light is mixed with a non-wavelength-converted light emitted by the light engine 210 Form a warm white light area along the black body radiation color of the CIE-1931 chromaticity coordinate diagram, and the color temperature of the warm white light falls between 2580K and 3220K.

In order to make the temperature range of the warm white light emitted by the light-emitting device 10 fall between 2580K and 3220K, a part of the light emitted by the first light-emitting element 114 undergoes wavelength conversion with the optical wavelength conversion element 120 to generate a wavelength-converted light. The color of the luminous light after the light is mixed with a non-wavelength-converted light emitted by the first light-emitting element 114 falls on the coordinate points Q1 (0.3162, 0.5367), Q2 (0.2620, 0.3878), Q3 of the CIE-1931 chromaticity coordinates (0.3822, 0.3827), Q4 (0.4308, 0.4639) surrounded by the color block, as shown in Figure 14.

Referring again to FIG. 12 , the cover body 240 is placed on the light engine 210 and the light wavelength conversion element 220 to prevent the fine dust from adhering to the light wavelength conversion element 120 and water vapor from penetrating into the light engine 210 to affect the lighting efficiency of the light emitting device 10 and service life, wherein the cover body 240 is made of light-transmitting and light-scattering materials.

The heat sink 230 is combined with the cover body 240 , so that the light engine 210 and the optical wavelength conversion element 220 are placed between the cover body 240 and the heat sink body 230 .

The conductive connector 250 is arranged on the side of the heat sink 230 opposite to the combination with the cover body 240. The light guide connector 250 is screwed into a general light bulb socket to be electrically connected to an AC power supply, wherein the conductive connector 250 is an E26 or E27 connector. .

The driving circuit 260 is disposed inside the heat sink 230 and electrically connected to the light engine 210 and the conductive joint 250 . The driving circuit 260 converts the AC power input through the conductive joint 250 into a DC power output, and the DC power is transmitted to the light engine 210 to make the light engine 210 emit light.

The circuit of the light emitting device of the second embodiment of the present invention is similar to that of the first embodiment, and will not be repeated here.

Referring to FIG. 15 , it is a schematic diagram of the light mixing method of the light emitting device of the present invention. The light mixing method of the light emitting device is described in detail as follows:

First, a light engine 30 is turned on. The light engine 30 includes at least one blue light emitting diode 32 and at least one red light emitting diode 34. The blue light emitting diode 32 emits a blue light Lb with a wavelength of 445 to 465 nm, and the red light emitting diode 34 emits a light with a wavelength of 600 nm. to 640 nm red light Lr. When the light engine 30 is turned on, a light Lt is emitted. The light Lt is the sum of the blue light Lb and the red light Lr. The light color of the light Lt falls on the CIE-1931 chromaticity coordinates (0.5745, 0.3370), (0.3420, 0.1796 ), (0.3075, 0.0839), (0.6581, 0.2518) surrounded by the range.

Next, the light from the light engine 30 excites a phosphor 36, which is yttrium aluminum garnet phosphor, silicate phosphor, terbium aluminum garnet phosphor, oxide phosphor, nitride phosphor or aluminum oxide phosphor.

In the light engine 30, the first part of the blue light Lb1 emitted by the blue light emitting diode 32 excites the phosphor powder 36 to undergo wavelength conversion to generate a wavelength converted light Ly, wherein the wavelength converted light Ly and a wavelength-untransformed light emitted by the blue light emitting diode 32 The light color of the second part of the converted blue light Lb2 mixed with light falls within the CIE-1931 chromaticity coordinates (0.3162, 0.5367), (0.2620, 0.3878), (0.3822, 0.3827) and (0.4327, 0.4639) surrounded by in the range. The blue light Lb is the sum of the first part of the blue light Lb1 and the second part of the blue light Lb2.

The wavelength-converted light Ly mixes with other non-wavelength-converted unconverted light (such as Lb2 and Lr) emitted by the light engine 30 to form a white light along the color of the black body radiation line of the CIE-1931 chromaticity coordinate diagram. The color temperature falls between 2580K and 3220K.

Based on the above, the light emitting device of the present invention uses a red light emitting diode as the red light source required in the warm white light spectrum. Compared with the prior art that uses blue light-emitting diodes to excite red phosphor powder as a red light source required for warm white light spectrum, the light-emitting device of the present invention can effectively improve the overall luminous efficiency without worrying about the problem of color shift. produce. In addition, the wavelength design of the red light emitting diode enables the light emitting device of the present invention to obtain high color rendering.

However, the above are only preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all equivalent changes and modifications made according to the claims of the present invention should still belong to the scope of patent coverage of the present invention. scope of protection.

Claims (25)

1. light-emitting device comprises:

One photo engine comprises a circuit board, a blue light-emitting diode and a red light-emitting diode, and this blue light-emitting diode and this red light-emitting diode are arranged at this circuit board; And

At least one Wavelength changing element, cover is should blue light-emitting diode at least;

Wherein, A part of light that this photo engine sends and the conversion of this Wavelength changing element generation wavelength are to produce a light wavelength conversion line; What this light wavelength conversion line and this photo engine sent one does not form a white light along the black body radiation linear light look of CIE-1931 chromatic diagram behind the light wavelength conversion line mixed light, and the colour temperature of this white light falls between the 2580K to 3220K.

2. light-emitting device as claimed in claim 1; It is characterized in that the conversion of a part of light that this blue light-emitting diode sent and this Wavelength changing element generation wavelength to be producing this light wavelength conversion line, a light wavelength conversion line mixed light luminous photochromic CIE-1931 chromaticity coordinate (0.3162 that falls within afterwards not of this light wavelength conversion line and this blue light-emitting diode; 0.5367), (0.2620; 0.3878), in the scope that surrounded of (0.3822,0.3827) and (0.4308,0.4639).

3. light-emitting device as claimed in claim 1 is characterized in that, this photo engine luminous photochromic falls within the zone that CIE-1931 chromaticity coordinate (0.5745,0.3370), (0.3420,0.1796), (0.3075,0.0839), (0.6581,0.2518) surrounded.

4. light-emitting device as claimed in claim 1 is characterized in that, the emission wavelength of this blue light-emitting diode is 445 to 465 nanometers.

5. light-emitting device as claimed in claim 1 is characterized in that, the emission wavelength of this red light-emitting diode is 600 to 640 nanometers.

6. light-emitting device as claimed in claim 1 is characterized in that, this Wavelength changing element comprises a printing opacity housing and at least one fluorescent material.

7. light-emitting device as claimed in claim 6 is characterized in that, this fluorescent material is yttrium aluminium garnet fluorescent powder, silicate fluorescent powder, terbium aluminium garnet fluorescent material, oxide fluorescent powder, Nitride phosphor or aluminum oxide fluorescent material.

8. light-emitting device as claimed in claim 6 is characterized in that, this printing opacity housing uses silica gel, epoxy resin, silica gel and epoxy resin composition or macromolecular material to form.

9. light-emitting device as claimed in claim 1 is characterized in that, this light-emitting device also comprises:

One radiating module comprises a housing, and this housing has one first side and second side with respect to this first side;

One cover body is fixed in this first side of this radiating module and covers this photo engine and this Wavelength changing element;

One drive circuit is arranged at this enclosure interior, and is electrically connected at this photo engine; And

One conductive contact is arranged at this second side of this radiating module, and is electrically connected at this drive circuit.

10. light-emitting device as claimed in claim 1 is characterized in that, this photo engine also includes a plurality of blue light-emitting diodes and a plurality of red light-emitting diode, and this blue light diode is electrically connected at this red light-emitting diode.

11. light-emitting device as claimed in claim 10 is characterized in that, parallel connection again after said a plurality of red light-emitting diodes and said a plurality of blue light-emitting diode are connected respectively.

12. light-emitting device as claimed in claim 10 is characterized in that, parallel connection again after said a plurality of red light-emitting diodes and the said a plurality of blue light-emitting diode mixing series connection.

13. like claim 11 or 12 described light-emitting devices; It is characterized in that; Respectively this blue light-emitting diode has at least one blue light-emitting diode crystal grain; And this blue light-emitting diode crystal grain comprises at least one nodal section, and respectively this red light-emitting diode has at least one red light-emitting diode crystal grain, and this red light-emitting diode crystal grain comprises at least one nodal section.

14. light-emitting device as claimed in claim 10 is characterized in that, said a plurality of red light-emitting diode settings concentrate on the center of this circuit board, and this blue light-emitting diode is around said a plurality of red light-emitting diodes.

15. a means of illumination comprises:

Light a photo engine, make this photo engine send a light, and this light luminous photochromic falls within the scope that CIE-1931 chromaticity coordinate (0.5745,0.3370), (0.3420,0.1796), (0.3075,0.0839), (0.6581,0.2518) surrounded;

Excite a fluorescent material; The light of the part that this photo engine sends and the conversion of this fluorescent material generation wavelength are to produce a light wavelength conversion line; This light wavelength conversion line and this photo engine send other one of wavelength conversion does not take place does not form a white light along the black body radiation linear light look of CIE-1931 chromatic diagram behind the light wavelength conversion line mixed light, the colour temperature of this white light falls within 2580K to 3220K.

16. means of illumination as claimed in claim 15; It is characterized in that; This light wavelength conversion line and this be luminous photochromic CIE-1931 chromaticity coordinate (0.3162,0.5367), (0.2620,0.3878), (0.3822 of falling within behind the light wavelength conversion line mixed light not; 0.3827) and (0.4327,0.4639) scope of being surrounded in.

17. means of illumination as claimed in claim 15 is characterized in that, this photo engine comprises at least one blue light-emitting diode and at least one red light-emitting diode.

18. light-emitting device as claimed in claim 17 is characterized in that, the emission wavelength of this blue light emitting diode element is 445 to 465 nanometers.

19. light-emitting device as claimed in claim 17 is characterized in that, the emission wavelength of this red light-emitting diode element is 600 to 640 nanometers.

20. light-emitting device as claimed in claim 15 is characterized in that, this fluorescent material is yttrium aluminium garnet fluorescent powder, silicate fluorescent powder, terbium aluminium garnet fluorescent material, oxide fluorescent powder, Nitride phosphor or aluminum oxide fluorescent material.

21. a bulb comprises:

One photo engine comprises a circuit board, one first light-emitting component and one second light-emitting component, and this first and second light-emitting component is arranged on this circuit board;

One light wavelength conversion element, part covers this photo engine;

One cover body is constituted with light transmissive material; And

One radiating piece combines with this cover body, makes this photo engine and this light wavelength conversion element place between this cover body and this radiating piece;

Wherein this bulb sends one along the photochromic white light of the black body radiation of CIE-1931 chromatic diagram, and the colour temperature of this white light falls between the 2580K to 3220K.

22. bulb as claimed in claim 21 is characterized in that, the emission wavelength of this first light-emitting component is that the emission wavelength of 445 to 465 nanometers and this second light-emitting component is 600 to 640 nanometers.

23. bulb as claimed in claim 21 is characterized in that, this photo engine luminous photochromic falls within the zone that CIE-1931 chromaticity coordinate (0.5745,0.3370), (0.3420,0.1796), (0.3075,0.0839), (0.6581,0.2518) surrounded.

24. bulb as claimed in claim 21 is characterized in that, this light wavelength conversion element comprises yttrium aluminium garnet fluorescent powder, silicate fluorescent powder, terbium aluminium garnet fluorescent material, oxide fluorescent powder, Nitride phosphor or aluminum oxide fluorescent material.

25. bulb as claimed in claim 21; It is characterized in that; The light that this first illuminating part sends is through the luminous photochromic CIE-1931 of falling within chromaticity coordinate (0.3162,0.5367), (0.2620,0.3878), (0.3822 behind this light wavelength conversion element; 0.3827) and (0.4308,0.4639) scope of being surrounded in.

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