CN102760820B - White-light LED (Light Emitting Diode) light source - Google Patents
White-light LED (Light Emitting Diode) light source Download PDFInfo
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- CN102760820B CN102760820B CN201210237235.3A CN201210237235A CN102760820B CN 102760820 B CN102760820 B CN 102760820B CN 201210237235 A CN201210237235 A CN 201210237235A CN 102760820 B CN102760820 B CN 102760820B
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Abstract
The invention relates to a white-light LED (Light Emitting Diode) light source. The white-light LED light source comprises a bowl cup, a blue-light LED chip arranged at the bottom of the bowl cup, yellow-green fluorescent powder and red fluorescent powder, wherein the yellow-green fluorescent powder and red fluorescent powder are arranged above the blue-light LED chip, and the yellow-green fluorescent powder is arranged above the red fluorescent powder. The white-light LED light source selects the yellow-green fluorescent powder with high luminous efficacy and a rare earth aluminate matrix, yellow-green silicate fluorescent powder and silica-based nitride red powder which are combined and matched with the blue-light LED chip, and through the reasonable design of the spatial layout of fluorescent powder with different systems inside an LED, the secondary absorption of yellow-green light by the nitride red fluorescent powder can be effectively overcome, and the relatively high emergent light efficiency also can be obtained simultaneously when a color rendering index is obviously promoted. A light-emitting system provided by the invention can realize white light with high luminous efficacy and a high color rendering index by adjusting the proportioning of fluorescent powder with different emission spectrums so as to meet the technical requirements of general lighting.
Description
Technical field
The present invention relates to a kind of white LED light source.
Background technology
Nineteen nineties, Japan's day sub-Developed high efficiency blue LED, and report with Y
3al
5o
12: Ce
3+(YAG:Ce) yellow emission fluorescence is as light-converting material, the white light LEDs combined with GaN blue-ray LED, because it has miniaturization, long-life, without mercury and the advantage such as energy-conservation, is thus described as and will surmounts the Novel pollution-free green solid lighting source of incandescent lamp, fluorescent lamp and HID lamp.
With GaN blue-ray LED and Y
3al
5o
12: Ce
3+(YAG:Ce) technical scheme of white light that yellow emission fluorescent material realizes as light-converting material has become the main flow of current white light LEDs, and day by day receives the concern of countries in the world researcher, and obtains a wide range of applications.But for general lighting field or to the exigent occasion of color rendition, in this, technical scheme still exists obvious deficiency.Cause color rendering lower owing to lacking red light in the spectrum formation of this kind of white light source, color rendering index (CRI) is 70 ~ 75, especially time low colour temperature (lower than 5000K), CRI can only reach about 65, be difficult to meet actual operation requirements, seriously constrain the promotion and application of white light LEDs in general lighting field.
In order to address this problem, be improve the effective ways of color rendering index (Ra) by adding the method for red fluorescence powder in YAG fluorescent powder, or adopt green and red fluorescence powder to carry out combining and also can obtain the high white light that develops the color.Wherein the performance of red fluorescence powder directly determines the light efficiency of high colour developing white light.At present, alternative red fluorescence powder has sulfide, molybdate, tungstates, aluminate and Nitride systems.The performances such as synthetic chemistry stability, luminous efficiency and temperature quenching, the red fluorescence powder of Nitride systems is current first-selection, and this kind of light-emitting phosphor efficiency is high, and chemical stability is higher.But due to the whole green-yellow light wave band of excitation spectrum nearly cover of this system fluorescent material, it can cause white LED light source light efficiency significantly to decline to the absorption again of green-yellow light, fall reaches more than 30%.
Summary of the invention
For the deficiency that existing height colour developing white LED light source exists in light efficiency, the invention provides a kind of specular removal height colour developing white LED light source.
White LED light source of the present invention, using blue-light LED chip as excitaton source, in conjunction with the spectral characteristic of yellowish green fluorescent powder and red fluorescence powder, by to green-yellow light fluorescent material and red fluorescence powder rational deployment spatially, design and develop new type light source, effectively can avoid absorbing again, thus obtain higher light extraction efficiency.
White LED light source of the present invention, comprises bowl cup, is arranged on the blue-light LED chip bottom bowl cup and the yellowish green fluorescent powder be placed in above blue-light LED chip and red fluorescence powder;
It is characterized in that, yellowish green fluorescent powder is placed in the top of red fluorescence powder;
Yellowish green fluorescent powder is selected from the one in two kinds of fluorescent material below:
(1) (Lu
1-c-(a+b)/3a ＇
c)
3al
5o
12: Ce
a, A "
b, A ＇ is at least one in La, Y, Gd or Tb, A " and be at least one in Pr, Dy or Sm, 0.0005≤c<1,0.005≤a≤0.15,0≤b≤0.08;
(2) Ba
(2-e-h-f)sr
eb ＇
fsi
go
(2+2g): Eu
h, B ＇ is at least one in Sc, Y, La, Cr or Er; 0<e≤0.75; 0.001<h≤0.09; 0≤f≤0.05; 0.75≤g≤1.5;
Red fluorescence powder is selected from the one in two kinds of fluorescent material below:
(1) Ca
1-j-k-q-ry
jc ＇
kx
l-mp
mc "
nn
p: Eu
q, C
0 r, wherein, C ＇ is at least one in Sr, Ba, Sc, Li, Na or K, and X is at least one in B, Al or Ga, and wherein Al is necessary, C, and " be at least one in Si, V or Nb, wherein Si is necessary, C
0for at least one in Dy, Er, Tm or Lu, wherein Dy is necessary, 0≤j≤0.2,0.001≤k≤0.2,0.5≤l≤1.5,0.5≤n≤1.5,0≤m≤0.1,2≤p≤4,0.01≤q≤0.2,0≤r≤0.3;
(2) D ＇
xd "
yn
z: Eu
t, D
0 s, in formula, D ＇ is at least one in Ca, Sr and Ba, and wherein Sr is necessary, D, and " be at least one in C, Si or Ge, wherein Si is necessary, D
0for at least one in Ce, Pr, Nd, Sm, Dy, Yb, 0.01≤x≤3,4≤y≤6, z=(2/3) x+ (4/3) y, 0.001≤t≤0.2,0≤s≤0.01;
It is 526 ~ 575nm that described yellowish green fluorescent powder launches main peak, and the transmitting main peak of red fluorescence powder is 600 ~ 660nm; The mass ratio of yellowish green fluorescent powder and red fluorescence powder is 60:40 ~ 95:5, what mass ratio controlled to ensure within the scope of this to obtain is white light, by regulate the mass ratio of two kinds of fluorescent material adjustable go out the white light of different tone, usual so-called positive white light refers to the white light of colour temperature within the scope of 5000 ~ 8000K, and warm white refers to the white light of colour temperature within the scope of 2500 ~ 4500K.The transmitting main peak of described blue-light LED chip is 440 ~ 470nm.
In the present invention, the yellowish green fluorescent powder implementation be placed in above red fluorescence powder has following several: 1. red fluorescence powder and yellowish green fluorescent powder are dispersed in packaging plastic respectively, make red fluorescence arogel and yellow-green fluorescence arogel, first red fluorescence arogel is coated on blue-light LED chip, after its drying, then yellow-green fluorescence arogel is coated in above it; Described packaging plastic is silica gel or epoxy resin; 2. the hyaline layer be made up of transparent material is set above blue-light LED chip in bowl cup, red fluorescence powder is fixed on hyaline layer uniformly, then yellowish green fluorescent powder is fixed to the surface of Red phosphor layer; 3. fixing yellow-green fluorescence bisque on hyaline layer, fixes Red phosphor layer in the below of hyaline layer; 4. respectively red fluorescence powder and yellowish green fluorescent powder and transparent material are mixed and made into red fluorescence muffin and yellow-green fluorescence muffin, then two kinds of fluorescence muffins are fixed together upper at lower yellow-green fluorescence muffin by red fluorescence muffin, be placed in above chip.In such scheme, that hyaline layer can be set to plane as required or cambered surface; Described transparent material is selected from glass, pottery, quartz, polymethyl methacrylate (PMMA), Merlon (PC), polyethylene (PE), mylar (PET), polyamide (PA), organosilicon, epoxy resin etc.
Described yellowish green fluorescent powder and red fluorescence powder are all adopt high temperature solid-state method well known in the art to be prepared from, and generally include following steps:
(1) oxide of element contained in chemical structural formula, carbonate, nitrate or other compounds is chosen as raw material;
(2) after being mixed by required various raw material, be placed in high temperature furnace and carry out roasting, heating temperature range is 1100 ~ 1600 DEG C, and temperature retention time is 2 ~ 20h.
(3), after product carries out fragmentation, crosses the PROCESS FOR TREATMENT such as sieve classification, washing, surface modification, drying by burning till of coming out of the stove, required fluorescent material is finally obtained.
Compared with prior art, tool of the present invention has the following advantages:
(1) the green-yellow light emitting phosphor of the rare earth aluminate substrate of specular removal, Suse green powder and silica-based nitride rouge and powder is selected to combine, coordinate blue-light LED chip, arrange in the space of LED inside by designing different system fluorescent material, effectively can overcome the double absorption of nitride red fluorescent powder to green-yellow light, while significantly promoting color rendering index, also can obtain higher light extraction efficiency.
(2) adopt scheme provided by the invention, obviously can improve hot spot, promote the outgoing light homogeneity of white light LEDs, thus the secondary optical lens using mixed light can be avoided, decrease the light efficiency loss that secondary light efficiency lens cause.
(3) another shortcoming of blue-light LED chip-YAG system is, the color of LED exports (spectral distribution and peak wavelength) and and can be added in the power on LED and change with the band gap width of LED active layer.Current LED chip is at production period, and always have a certain proportion of LED and be greater than and be less than the active layer making of required width with actual band gap width, therefore the color of LED exports and there is certain fluctuation range, and this also can cause the photochromic change of final white light LEDs.The present invention coordinates blue chip owing to have employed bi-component fluorescent material, can reduce the color fluctua amplitude of final white light to a certain extent, is conducive to promoting the yield produced white light LEDs and produce.
Accompanying drawing explanation
White LED light source principle of luminosity schematic diagram in Fig. 1 prior art.
The cross section structure schematic diagram of the white LED light source of Fig. 2 embodiment of the present invention 1.
The cross section structure schematic diagram of the white LED light source of Fig. 3 embodiment of the present invention 2.
The cross section structure schematic diagram of the white LED light source of Fig. 4 embodiment of the present invention 3.
The cross section structure schematic diagram of the white LED light source of Fig. 5 embodiment of the present invention 4.
The cross section structure schematic diagram of the white LED light source of Fig. 6 embodiment of the present invention 5.
Fig. 7 is the spectrogram of the white LED light source of the embodiment of the present invention 1.
Fig. 8 is the spectrogram of the white LED light source of the embodiment of the present invention 5.
Embodiment
Comparative example 1
Select and launch the gallium-nitride blue chip that main peak is in 455 ~ 460nm, the composition of the yellowish green fluorescent powder of employing is Y
2.95al
5o
12: Ce
0.05, it launches main peak is 568.4nm, and the red fluorescence meal component of employing is Ca
0.85sr
0.1alSiN
3: Eu
0.05, emission wavelength is 643nm, and two kinds of fluorescent material are added furnishing phosphor gel in silica gel according to the mass ratio mixing of 90.2:9.8, and cover chip surface, its principle of luminosity schematic diagram as shown in Figure 1.The white-light optics data of this light source are in table 1.
As shown in Figure 1, the blue light that blue-ray LED chip 1 sends, part blue light 2 excites the mixed fluorescent powder 4 above chip, the mixed light be made up of green-yellow light 5 and ruddiness 6 is sent after mixed fluorescent powder is stimulated, this part mixed light mixes with the some blue light 3 of transmission, the perceived white light 7 of final acquisition naked eyes.
Comparative example 2
Select and launch the gallium-nitride blue chip that main peak is in 450 ~ 455nm, the composition of the yellowish green fluorescent powder of employing is Y
2.87gd
0.05al
5o
12: Ce
0.08, it launches main peak is 571.4nm, and the red fluorescence meal component of employing is Ca
0.87sr
0.08alSiN
3: Eu
0.05, emission wavelength is 645nm, is mixed by the mass ratio of two kinds of fluorescent material according to 88.4:11.6, then joins in silica gel and make phosphor gel, is then filled in bowl cup.Its principle of luminosity schematic diagram as shown in Figure 1.The white-light optics data of this light source are in table 2.
Embodiment 1
Select and launch the gallium-nitride blue chip that main peak is in 445 ~ 450nm, the composition of the yellowish green fluorescent powder of employing is Y
2.95al
5o
12: Ce
0.05, it launches main peak is 568.4nm, and the red fluorescence meal component of employing is Ca
0.85sr
0.1alSiN
3: Eu
0.05emission wavelength is 643nm, the mass ratio of these two kinds of fluorescent material is 90.3:9.7, red fluorescence powder and yellowish green fluorescent powder are dispersed in silica gel respectively, make red fluorescence arogel and yellow-green fluorescence arogel, first red fluorescence arogel is coated on blue-light LED chip, after its drying, then yellow-green fluorescence arogel is coated in above it.Its cross section structure schematic diagram as shown in Figure 2.The white-light optics data of this light source are in table 1.
As shown in Figure 2, the blue light that blue-light LED chip 1 sends is through packaging plastic 5, the ruddiness that first a part excites the red fluorescence powder 2 of below to send, another part transmission from the gap of fluorescent powder grain is gone out, excite the yellowish green fluorescent powder 3 being in top to send green-yellow light, the blue light of last part transmission and ruddiness, green-yellow light are mixed to get white light again.
Embodiment 2
Select and launch the gallium-nitride blue chip that main peak is in 452 ~ 457nm, the composition of the yellowish green fluorescent powder of employing is Y
2.95al
5o
12: Ce
0.05, it launches main peak is 568.4nm, and the composition of red fluorescence powder is Ca
0.85sr
0.1alSiN
3: Eu
0.05, emission wavelength is 643nm, and the mass ratio of these two kinds of fluorescent material is 90.3:9.7.First red fluorescence powder is evenly coated on the hyaline layer made with Merlon (PC), then yellowish green fluorescent powder is coated in the surface of Red phosphor layer, the hyaline layer being fixed with fluorescent material to be placed in bowl cup above blue-ray LED chip.Its cross section structure schematic diagram as shown in Figure 3.The white-light optics data of this light source are in table 1.
As shown in Figure 3, the ruddiness that first the blue light part that blue-ray LED chip 1 sends excites the red fluorescence powder 2 on hyaline layer 4 to send, another part is gone out from transmission from red fluorescence powder 2 gap, excite the yellowish green fluorescent powder 3 be in above red fluorescence powder 2 to send green-yellow light, the blue light of last part transmission and ruddiness, green-yellow light are mixed to get white light again.
Embodiment 3
Select and launch the gallium-nitride blue chip that main peak is in 450 ~ 455nm, the composition of the yellowish green fluorescent powder of employing is Y
2.95al
5o
12: Ce
0.05, it launches main peak is 568.4nm, and the composition of red fluorescence powder is Ca
0.85sr
0.1alSiN
3: Eu
0.05, emission wavelength is 643nm, and the total amount of these two kinds of fluorescent material is than being 91.6:8.4.Respectively red fluorescence powder and green emitting phosphor and polyethylene (PE) are mixed and made into red fluorescence muffin and yellow-green fluorescence muffin, again two kinds of fluorescence muffins are fixed together upper in lower yellow green according to redness, be placed in bowl cup above blue-light LED chip, its cross section structure schematic diagram as shown in Figure 4.The white-light optics data of this light source are in table 1.
As shown in Figure 4, first the blue light part that blue-light LED chip 1 sends excites the red fluorescence powder 2 of lower floor to send ruddiness, another part is gone out from transmission from red fluorescence powder 2 gap, excite the yellowish green fluorescent powder 3 being in top layer to send green-yellow light, the blue light of last part transmission and ruddiness, green-yellow light are mixed to get white light again
Embodiment 4
Select and launch the gallium-nitride blue chip that main peak is in 460 ~ 465nm, the composition of the yellowish green fluorescent powder of employing is Y
2.95al
5o
12: Ce
0.05, it launches main peak is 568.4nm, and red fluorescence meal component is Ca
0.85sr
0.1alSiN
3: Eu
0.05, emission wavelength is 643nm, and the mass ratio of these two kinds of fluorescent material is 90.5:9.5.Yellowish green fluorescent powder be fixed on above the hyaline layer be made up of polymethyl methacrylate (PMMA), then be fixed on below hyaline layer by red fluorescence powder, the hyaline layer then this two sides being all fixed with phosphor powder layer to be placed in bowl cup above blue-light LED chip.Its cross section structure schematic diagram as shown in Figure 5.The white-light optics data of this light source are in table 1.
As shown in Figure 5, first the blue light part that blue-light LED chip 1 sends excites the red fluorescence powder 2 of hyaline layer 3 lower floor to send ruddiness, another part is gone out from transmission from red fluorescence powder 2 gap, excite the yellowish green fluorescent powder 5 being in top layer to send green-yellow light, the blue light of last part transmission and ruddiness, green-yellow light are mixed to get white light again.
Embodiment 5
Select and launch the gallium-nitride blue chip that main peak is in 455 ~ 457.5nm, the composition of the yellowish green fluorescent powder of employing is Y
2.95al
5o
12: Ce
0.05, it launches main peak is 568.4nm, and the composition of red fluorescence powder is Ca
0.85sr
0.1alSiN
3: Eu
0.05, emission wavelength is 643nm, and the mass ratio of these two kinds of fluorescent material is 90.6:9.4.First red fluorescence powder is evenly coated on the arc surfaced hyaline layer be made up of quartz, more yellowish green powder is coated in the surface of Red phosphor layer, the hyaline layer being fixed with fluorescent material to be placed in bowl cup above blue-light LED chip.Its cross section structure schematic diagram as shown in Figure 6.The white-light optics data of this light source are in table 1.
As shown in Figure 6, first the blue light part that blue-light LED chip 1 sends excites the red fluorescence powder 2 of arc surfaced hyaline layer 5 lower floor to send ruddiness, another part is gone out from transmission from red fluorescence powder gap, excite the yellowish green fluorescent powder 3 being in top layer to send green-yellow light, the blue light of last part transmission and ruddiness, green-yellow light are mixed to get white light again.
Embodiment 6
Select and launch the gallium-nitride blue chip that main peak is in 455 ~ 460nm, the composition adopting yellowish green fluorescent powder is Y
2.87gd
0.05al
5o
12: Ce
0.08, it launches main peak is 571.4nm, and the composition of red fluorescence powder is Ca
0.87sr
0.08alSiN
3: Eu
0.05, emission wavelength is 645nm, takes two kinds of fluorescent material according to the mass ratio of 88.7:11.3, joins furnishing phosphor gel in epoxy resin respectively.First red fluorescence arogel is coated in blue-light LED chip surface, after solidification drying, then yellow-green fluorescence arogel is coated in red fluorescence arogel upper strata.Its cross section structure schematic diagram as shown in Figure 2.The white-light optics data of this light source are in table 2.
Embodiment 7
Select and launch the gallium-nitride blue chip that main peak is in 455 ~ 450nm, the composition of the yellowish green fluorescent powder of employing is Y
2.87gd
0.05al
5o
12: Ce
0.08, it launches main peak is 571.4nm, and the composition of red fluorescence powder is Ca
0.87sr
0.08alSiN
3: Eu
0.05, emission wavelength is 645nm, and two kinds of fluorescent material mass ratioes are 89.3:10.7.Together, wherein transparent material adopts organosilicon for manufacture method and embodiment 3.The white-light optics data of this light source are in table 2.
Embodiment 8
Select and launch the gallium-nitride blue chip that main peak is in 455 ~ 457.5nm, the composition of the yellowish green fluorescent powder of employing is Y
2.87gd
0.05al
5o
12: Ce
0.08, it launches main peak is 571.4nm, and the composition of red fluorescence powder is Ca
0.87sr
0.08alSiN
3: Eu
0.05, emission wavelength is 645nm, and two kinds of fluorescent material are 88.7:11.3.Manufacture method is identical with embodiment 4, and wherein transparent material adopts pottery.The white-light optics data of this light source are in table 2.
Embodiment 9
Select and launch the gallium-nitride blue chip that main peak is in 450 ~ 452.5nm, the composition of the yellowish green fluorescent powder of employing is Y
2.87gd
0.05al
5o
12: Ce
0.08, it launches main peak is 571.4nm, and the composition of red fluorescence powder is Ca
0.87sr
0.08alSiN
3: Eu
0.05, emission wavelength is 645nm, and the mass ratio of two kinds of fluorescent material is 90.7:9.3.Manufacture method is identical with embodiment 4.The white-light optics data of this light source are in table 2.
Embodiment 10 ~ 13
Embodiment 15 ~ 18
The positive white-light optics performance index contrast of table 1
As can be seen from the table, when colour temperature is about 5500K, when color rendering index is suitable, Ra is about 82, and embodiment 1 ~ 5 all has remarkable lifting compared with the light efficiency of comparative example 1, and lifting amplitude reaches more than 8%.
Table 2 warm white spectrophotometric data contrasts
As can be seen from the table, when colour temperature is about 3500K, when color rendering index is suitable, Ra is about 82, and embodiment 6 ~ 9 all has remarkable lifting compared with the light efficiency of comparative example 2, and lifting amplitude reaches more than 12%.
Table 3 warm white spectrophotometric data contrasts
As can be seen from the table, when colour temperature is about 3500K, embodiment 7 ~ 12 is compared with comparative example 1 when suitable light efficiency, and color rendering index all has and significantly promotes.
The test result of consolidated statement 1, table 2 and table 3 can be found out, white LED light source of the present invention, while significantly promoting color rendering index, also can obtain higher light extraction efficiency.
Claims (7)
1. a white LED light source, comprises bowl cup, is arranged on the blue-light LED chip bottom bowl cup and the yellowish green fluorescent powder be placed in above blue-light LED chip and red fluorescence powder;
It is characterized in that, yellowish green fluorescent powder is placed in the top of red fluorescence powder;
Yellowish green fluorescent powder is selected from the one in two kinds of fluorescent material below:
(1) (Lu
1-c-(a+b)/3a '
c)
3al
5o
12: Ce
a, A "
b, A ' is at least one in La, Y, Gd or Tb, A " and be at least one in Pr, Dy or Sm, 0.0005≤c<1,0.005≤a≤0.15,0≤b≤0.08;
(2) Ba
(2-e-h-f)sr
eb '
fsi
go
(2+2g): Eu
h, B ' is at least one in Sc, Y, La, Cr or Er; 0<e≤0.75; 0.001<h≤0.09; 0≤f≤0.05; 0.75≤g≤1.5;
Red fluorescence powder is selected from the one in two kinds of fluorescent material below:
(1) Ca
1-j-k-q-ry
jc '
kx
l-mp
mc "
nn
p: Eu
q, C
0r, wherein, C ' is at least one in Sr, Ba, Sc, Li, Na or K, and X is at least one in B, Al or Ga, and wherein Al is necessary, C, and " be at least one in Si, V or Nb, wherein Si is necessary, C
0for at least one in Dy, Er, Tm or Lu, wherein Dy is necessary, 0≤j≤0.2,0.001≤k≤0.2,0.5≤l≤1.5,0.5≤n≤1.5,0≤m≤0.1,2≤p≤4,0.01≤q≤0.2,0≤r≤0.3;
(2) D '
xd "
yn
z: Eu
t, D
0 s, in formula, D ' is at least one in Ca, Sr or Ba, and wherein Sr is necessary, D, and " be at least one in C, Si or Ge, wherein Si is necessary, D
0for at least one in Ce, Pr, Nd, Sm, Dy, Yb, 0.01≤x≤3,4≤y≤6, z=(2/3) x+ (4/3) y, 0.001≤t≤0.2,0≤s≤0.01;
It is 526 ~ 575nm that described yellowish green fluorescent powder launches main peak, and the transmitting main peak of red fluorescence powder is 600 ~ 660nm; The mass ratio of yellowish green fluorescent powder and red fluorescence powder is 60:40 ~ 95:5.
2. white LED light source as claimed in claim 1, it is characterized in that, the implementation that yellowish green fluorescent powder is placed in above red fluorescence powder is: first red fluorescence powder and yellowish green fluorescent powder are dispersed in packaging plastic respectively, make red fluorescence arogel and yellow-green fluorescence arogel, red fluorescence arogel is coated on blue-light LED chip, after its drying, then yellow-green fluorescence arogel is coated in above it.
3. white LED light source as claimed in claim 2, it is characterized in that, described packaging plastic is silica gel or epoxy resin.
4. white LED light source as claimed in claim 1, it is characterized in that, yellowish green fluorescent powder is placed in the implementation above red fluorescence powder: in bowl cup, arrange the hyaline layer be made up of transparent material above blue-light LED chip, red fluorescence powder is fixed on hyaline layer uniformly, again yellowish green fluorescent powder is fixed to the surface of Red phosphor layer, or yellow-green fluorescence bisque is fixed on hyaline layer, fix Red phosphor layer in the below of hyaline layer.
5. white LED light source as claimed in claim 4, is characterized in that, described hyaline layer be plane or cambered surface.
6. white LED light source as claimed in claim 1, it is characterized in that, the implementation that yellowish green fluorescent powder is placed in above red fluorescence powder is: respectively red fluorescence powder and yellowish green fluorescent powder and transparent material are mixed and made into red fluorescence muffin and yellow-green fluorescence muffin, again two kinds of fluorescence muffins are fixed together upper at lower yellow-green fluorescence muffin by red fluorescence muffin, are placed in above chip.
7. the white LED light source as described in claim 4 or 5 or 6, it is characterized in that, described transparent material is selected from glass, pottery, quartz, polymethyl methacrylate, Merlon, polyethylene, polyamide, organosilicon or epoxy resin.
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| CN201210237235.3A CN102760820B (en) | 2012-07-10 | 2012-07-10 | White-light LED (Light Emitting Diode) light source |
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|---|---|---|---|
| CN201210237235.3A CN102760820B (en) | 2012-07-10 | 2012-07-10 | White-light LED (Light Emitting Diode) light source |
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