CN102760820A - White-light LED (Light Emitting Diode) light source - Google Patents
White-light LED (Light Emitting Diode) light source Download PDFInfo
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- CN102760820A CN102760820A CN2012102372353A CN201210237235A CN102760820A CN 102760820 A CN102760820 A CN 102760820A CN 2012102372353 A CN2012102372353 A CN 2012102372353A CN 201210237235 A CN201210237235 A CN 201210237235A CN 102760820 A CN102760820 A CN 102760820A
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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, Japanese Ri Ya company succeeds in developing efficient blue-ray LED, and has reported with Y
3Al
5O
12: Ce
3+(YAG:Ce) yellow emission fluorescence is as light-converting material; The white light LEDs that combines with the GaN blue-ray LED; Because it has miniaturization, long-life, no mercury and advantage such as energy-conservation, thereby is described as the novel pollution-free green solid-state illumination light source that surmounts incandescent lamp, fluorescent lamp and HID lamp.
With GaN blue-ray LED and Y
3Al
5O
12: Ce
3+(YAG:Ce) yellow emission fluorescent material has become the main flow of current white light LEDs as the technical scheme of the white light of light-converting material realization, and receives countries in the world researcher's concern day by day, and has obtained to use widely.But be used for the general lighting field or to the exigent occasion of color rendition, still there is obvious deficiency in technical scheme in this.Lacking red light in the spectrum formation owing to this kind white light source causes color rendering lower; Color rendering index (CRI) is 70～75; When especially hanging down colour temperature (being lower than 5000K); CRI can only reach about 65, is difficult to satisfy actual instructions for use, has seriously restricted the promotion and application of white light LEDs in the general lighting field.
In order to address this problem, be to improve the effective ways of color rendering index (Ra) through the method that in YAG fluorescent material, adds red fluorescence powder, perhaps adopt green and red fluorescence powder to make up and also can obtain high colour developing white light.Wherein the performance of red fluorescence powder has directly determined the light efficiency of high colour developing white light.At present, alternative red fluorescence powder has sulfide, molybdate, tungstates, aluminate and nitride system.Performances such as synthetic chemistry stability, luminous efficiency and temperature quenching, the red fluorescence powder of nitride system is present first-selection, and this kind light-emitting phosphor efficient is high, and chemical stability is higher.But because the excitation spectrum of this system fluorescent material has almost covered whole green-yellow light wave band, its absorption again to green-yellow light can cause the white LED light source light efficiency significantly to descend, and fall reaches more than 30%.
Summary of the invention
In the deficiency that exists aspect the light efficiency, the invention provides the high colour developing of a kind of high light efficiency white LED light source to existing high colour developing white LED light source.
White LED light source of the present invention; With blue-light LED chip as excitaton source; In conjunction with the spectral characteristic of yellow-green fluorescence powder and red fluorescence powder,, designed and developed new type light source through to green-yellow light fluorescent material and red fluorescence powder rational deployment spatially; Can effectively avoid absorbing again, thereby obtain higher light extraction efficiency.
White LED light source of the present invention comprises the bowl cup, is arranged on the blue-light LED chip of bowl cup bottom and yellow-green fluorescence powder and the red fluorescence powder that places the blue-light LED chip top;
It is characterized in that the yellow-green fluorescence powder places the top of red fluorescence powder;
The yellow-green fluorescence powder is selected from a kind of in following two kinds of fluorescent material:
(1) (Lu
1-c-(a+b)/3A ＇
c)
3Al
5O
12: Ce
a, A "
b, A ＇ is at least a among La, Y, Gd or the Tb, A " and be at least a among Pr, Dy or the 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 a among Sc, Y, La, Cr or the 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 a kind of in following two kinds of fluorescent material:
(1) Ca
1-j-k-q-rY
jC ＇
kX
L-mP
mC "
nN
p: Eu
q, C
0 r, wherein, C ＇ is at least a among Sr, Ba, Sc, Li, Na or the K, X is at least a among B, Al or the Ga, wherein Al is necessary, C, and " be at least a among Si, V or the Nb, wherein Si is necessary, C
0At least a among Dy, Er, Tm or the 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, D ＇ is at least a among Ca, Sr and the Ba in the formula, wherein Sr is necessary, D, and " be at least a among C, Si or the Ge, wherein Si is necessary, D
0At least a among Ce, Pr, Nd, Sm, Dy, the Yb, 0.01≤x≤3,4≤y≤6, z=(2/3) x+ (4/3) y, 0.001≤t≤0.2,0≤s≤0.01;
Said yellow-green fluorescence powder emission main peak is 526～575nm, and the emission main peak of red fluorescence powder is 600～660nm; The mass ratio of yellow-green fluorescence powder and red fluorescence powder is 60:40 ~ 95:5; It is white light that mass ratio is controlled at what can guarantee in this scope to obtain; Go out the white light of different tones than scalable through the quality of regulating two kinds of fluorescent material; Usually so-called positive white light is meant the white light of colour temperature in 5000 ~ 8000K scope, and warm white is meant the white light of colour temperature in 2500 ~ 4500K scope.The emission main peak of said blue-light LED chip is 440～470nm.
Among the present invention; The yellow-green fluorescence powder places the implementation of red fluorescence powder top to have following several kinds: 1. red fluorescence powder and yellow-green fluorescence powder are dispersed in packaging plastic respectively; Process red fluorescence arogel and yellow-green fluorescence arogel; Earlier the red fluorescence arogel is coated on the blue-light LED chip, treat its drying after, again the yellow-green fluorescence arogel is applied above it; Said packaging plastic is silica gel or epoxy resin; 2. in the bowl cup blue-light LED chip above the hyaline layer of being processed by transparent material is set, red fluorescence powder is fixed on the hyaline layer uniformly, again the yellow-green fluorescence powder is fixed to the surface of red fluorescence bisque; 3. fixing yellow-green fluorescence bisque on hyaline layer, fixing red fluorescence bisque below hyaline layer; 4. respectively red fluorescence powder and yellow-green fluorescence 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 last at yellow-green fluorescence muffin down by the red fluorescence muffin, place the chip top.In the such scheme, that hyaline layer can be set to the 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.
Said yellow-green fluorescence powder and red fluorescence powder all are to adopt high temperature solid-state method well known in the art to be prepared from, and generally include following steps:
(1) oxide, carbonate, nitrate or other compounds of choosing element contained in the chemical structural formula are as raw material;
(2) with required various raw materials mix evenly after, place high temperature furnace to carry out roasting, the heating-up temperature scope is 1100 ~ 1600 ℃, temperature retention time is 2 ~ 20h.
(3) will come out of the stove burn till PROCESS FOR TREATMENT such as product carries out fragmentation, crosses sieve classification, washing, surface modification, drying after, finally obtain required fluorescent material.
Compared with prior art, the present invention has following advantage:
(1) select for use green-yellow light emitting phosphor, Suse green powder and the silica-based nitride rouge and powder of the rare earth aluminate substrate of high light efficiency to make up; Cooperate blue-light LED chip; Arrange in the LED volume inside through designing different system fluorescent material; The secondary absorption of nitride red fluorescent powder can be effectively overcome, can when significantly promoting color rendering index, also higher light-emitting efficiency can be obtained green-yellow light.
(2) adopt scheme provided by the invention, can obviously improve hot spot, promote the outgoing light homogeneity of white light LEDs, thereby can avoid the use of the secondary optical lens of mixed light, reduced the light efficiency loss that secondary light efficiency lens cause.
(3) another shortcoming of blue-light LED chip-YAG system is, the color output (spectral distribution and peak wavelength) of LED can change with the power that is added on the LED with the band gap width of LED active layer.At present led chip is at production period, always have a certain proportion of LED and be with actual band gap width greater than making with the active layer less than required width, so the color of LED exports and have certain fluctuation range, and this also can cause the photochromic variation of final white light LEDs.The present invention can reduce the color fluctuating range of final white light to a certain extent owing to adopted bi-component phosphor powder matching blue chip, helps promoting the yield of producing white light LEDs production.
Description of drawings
White LED light source principle of luminosity sketch map in Fig. 1 prior art.
The cross section structure sketch map of the white LED light source of Fig. 2 embodiment of the invention 1.
The cross section structure sketch map of the white LED light source of Fig. 3 embodiment of the invention 2.
The cross section structure sketch map of the white LED light source of Fig. 4 embodiment of the invention 3.
The cross section structure sketch map of the white LED light source of Fig. 5 embodiment of the invention 4.
The cross section structure sketch map of the white LED light source of Fig. 6 embodiment of the invention 5.
Fig. 7 is the spectrogram of the white LED light source of the embodiment of the invention 1.
Fig. 8 is the spectrogram of the white LED light source of the embodiment of the invention 5.
Embodiment
Comparative Examples 1
Select for use the emission main peak to be in the gallium nitride blue chip of 455～460nm, the composition of the yellow-green fluorescence powder of employing is Y
2.95Al
5O
12: Ce
0.05, its emission main peak is 568.4nm, 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 according to furnishing phosphor gel in the mass ratio mixing adding silica gel of 90.2:9.8, are covered chip surface, its principle of luminosity sketch map is as shown in Figure 1.The white-light optics data of this light source are seen 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 of chip top; Send the mixed light of being made up of green-yellow light 5 and ruddiness 6 after mixed fluorescent powder is stimulated, this part mixed light mixes with the part blue light 3 of transmission, finally obtains the perceived white light 7 of naked eyes.
Comparative Examples 2
Select for use the emission main peak to be in the gallium nitride blue chip of 450～455nm, the composition of the yellow-green fluorescence powder of employing is Y
2.87Gd
0.05Al
5O
12: Ce
0.08, its emission main peak is 571.4nm, the red fluorescence meal component of employing is Ca
0.87Sr
0.08AlSiN
3: Eu
0.05, emission wavelength is 645nm, and the mass ratio of two kinds of fluorescent material according to 88.4:11.6 mixed, and joins and processes phosphor gel in the silica gel, is filled into then in the bowl cup.Its principle of luminosity sketch map is as shown in Figure 1.The white-light optics data of this light source are seen table 2.
Select for use the emission main peak to be in the gallium nitride blue chip of 445～450nm, the composition of the yellow-green fluorescence powder of employing is Y
2.95Al
5O
12: Ce
0.05, its emission main peak is 568.4nm, the red fluorescence meal component of employing is Ca
0.85Sr
0.1AlSiN
3: Eu
0.05Emission wavelength is 643nm, and the mass ratio of these two kinds of fluorescent material is 90.3:9.7, is dispersed in red fluorescence powder and yellow-green fluorescence powder in the silica gel respectively; Process red fluorescence arogel and yellow-green fluorescence arogel; Earlier the red fluorescence arogel is coated on the blue-light LED chip, treat its drying after, again the yellow-green fluorescence arogel is applied above it.Its cross section structure sketch map is as shown in Figure 2.The white-light optics data of this light source are seen table 1.
As shown in Figure 2; The blue light that blue-light LED chip 1 sends sees through packaging plastic 5; The ruddiness that a part at first excites the red fluorescence powder 2 of below to send; Another part transmission from the gap of fluorescent powder grain is gone out, and excites the yellow-green fluorescence powder 3 that is in the top to send green-yellow light, and the blue light of last part transmission mixes once more with ruddiness, green-yellow light and obtains white light.
Embodiment 2
Select for use the emission main peak to be in the gallium nitride blue chip of 452～457nm, the composition of the yellow-green fluorescence powder of employing is Y
2.95Al
5O
12: Ce
0.05, its emission main peak is 568.4nm, the composition of red fluorescence powder is Ca
0.85Sr
0.1AlSiN
3: Eu
0.05, emission wavelength is 643nm, the mass ratio of these two kinds of fluorescent material is 90.3:9.7.At first red fluorescence powder evenly is coated on the hyaline layer of processing with Merlon (PC), again the yellow-green fluorescence powder is coated in the surface of red fluorescence bisque, the hyaline layer that is fixed with fluorescent material is placed blue-ray LED chip top in the bowl cup.Its cross section structure sketch map is as shown in Figure 3.The white-light optics data of this light source are seen table 1.
As shown in Figure 3; The ruddiness that the blue light part that blue-ray LED chip 1 sends at first excites the red fluorescence powder 2 on the hyaline layer 4 to send; Another part is gone out from transmission from red fluorescence powder 2 gaps; Excite the yellow-green fluorescence powder 3 that is in red fluorescence powder 2 tops to send green-yellow light, the blue light of last part transmission mixes once more with ruddiness, green-yellow light and obtains white light.
Embodiment 3
Select for use the emission main peak to be in the gallium nitride blue chip of 450～455nm, the composition of the yellow-green fluorescence powder of employing is Y
2.95Al
5O
12: Ce
0.05, its emission main peak is 568.4nm, the composition of red fluorescence powder is Ca
0.85Sr
0.1AlSiN
3: Eu
0.05, emission wavelength is 643nm, 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 last in following yellow green according to redness; Place blue-light LED chip top in the bowl cup, its cross section structure sketch map is as shown in Figure 4.The white-light optics data of this light source are seen table 1.
As shown in Figure 4; The blue light part that blue-light LED chip 1 sends at first excites the red fluorescence powder 2 of lower floor to send ruddiness; Another part is gone out from transmission from red fluorescence powder 2 gaps; Excite the yellow-green fluorescence powder 3 that is in the top layer to send green-yellow light, the blue light of last part transmission mixes once more with ruddiness, green-yellow light and obtains white light
Embodiment 4
Select for use the emission main peak to be in the gallium nitride blue chip of 460～465nm, the composition of the yellow-green fluorescence powder of employing is Y
2.95Al
5O
12: Ce
0.05, its emission main peak is 568.4nm, the red fluorescence meal component is Ca
0.85Sr
0.1AlSiN
3: Eu
0.05, emission wavelength is 643nm, the mass ratio of these two kinds of fluorescent material is 90.5:9.5.The yellow-green fluorescence powder is fixed on above the hyaline layer of being processed by polymethyl methacrylate (PMMA), red fluorescence powder is fixed on below the hyaline layer again, the hyaline layer that then this two sides all is fixed with phosphor powder layer places blue-light LED chip top in the bowl cup.Its cross section structure sketch map is as shown in Figure 5.The white-light optics data of this light source are seen table 1.
As shown in Figure 5; The blue light part that blue-light LED chip 1 sends at first excites the red fluorescence powder 2 of hyaline layer 3 lower floors to send ruddiness; Another part is gone out from transmission from red fluorescence powder 2 gaps; Excite the yellow-green fluorescence powder 5 that is in the top layer to send green-yellow light, the blue light of last part transmission mixes once more with ruddiness, green-yellow light and obtains white light.
Embodiment 5
Select for use the emission main peak to be in the gallium nitride blue chip of 455～457.5nm, the composition of the yellow-green fluorescence powder of employing is Y
2.95Al
5O
12: Ce
0.05, its emission main peak is 568.4nm, the composition of red fluorescence powder is Ca
0.85Sr
0.1AlSiN
3: Eu
0.05, emission wavelength is 643nm, the mass ratio of these two kinds of fluorescent material is 90.6:9.4.At first red fluorescence powder evenly is coated on the arc surfaced hyaline layer of being processed by quartz, more yellowish green powder is coated in the surface of red fluorescence bisque, the hyaline layer that is fixed with fluorescent material is placed blue-light LED chip top in the bowl cup.Its cross section structure sketch map is as shown in Figure 6.The white-light optics data of this light source are seen table 1.
As shown in Figure 6; The blue light part that blue-light LED chip 1 sends at first excites the red fluorescence powder 2 of arc surfaced hyaline layer 5 lower floors to send ruddiness; Another part is gone out from transmission from the red fluorescence powder gap; Excite the yellow-green fluorescence powder 3 that is in the top layer to send green-yellow light, the blue light of last part transmission mixes once more with ruddiness, green-yellow light and obtains white light.
Embodiment 6
Select for use the emission main peak to be in the gallium nitride blue chip of 455～460nm, adopting the composition of yellow-green fluorescence powder is Y
2.87Gd
0.05Al
5O
12: Ce
0.08, its emission main peak is 571.4nm, the composition of red fluorescence powder is Ca
0.87Sr
0.08AlSiN
3: Eu
0.05, emission wavelength is 645nm, takes by weighing two kinds of fluorescent material according to the mass ratio of 88.7:11.3, joins furnishing phosphor gel in the epoxy resin respectively.Earlier the red fluorescence arogel is coated in the blue-light LED chip surface, after the curing drying, again the yellow-green fluorescence arogel is coated in red fluorescence arogel upper strata.Its cross section structure sketch map is as shown in Figure 2.The white-light optics data of this light source are seen table 2.
Embodiment 7
Select for use the emission main peak to be in the gallium nitride blue chip of 455～450nm, the composition of the yellow-green fluorescence powder of employing is Y
2.87Gd
0.05Al
5O
12: Ce
0.08, its emission main peak is 571.4nm, the composition of red fluorescence powder is Ca
0.87Sr
0.08AlSiN
3: Eu
0.05, emission wavelength is 645nm, two kinds of fluorescent material mass ratioes are 89.3:10.7.Manufacture method and embodiment 3 are same, and wherein transparent material adopts organosilicon.The white-light optics data of this light source are seen table 2.
Embodiment 8
Select for use the emission main peak to be in the gallium nitride blue chip of 455～457.5nm, the composition of the yellow-green fluorescence powder of employing is Y
2.87Gd
0.05Al
5O
12: Ce
0.08, its emission main peak is 571.4nm, the composition of red fluorescence powder is Ca
0.87Sr
0.08AlSiN
3: Eu
0.05, emission wavelength is 645nm, 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 seen table 2.
Embodiment 9
Select for use the emission main peak to be in the gallium nitride blue chip of 450～452.5nm, the composition of the yellow-green fluorescence powder of employing is Y
2.87Gd
0.05Al
5O
12: Ce
0.08, its emission main peak is 571.4nm, the composition of red fluorescence powder is Ca
0.87Sr
0.08AlSiN
3: Eu
0.05, emission wavelength is 645nm, 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 seen table 2.
Embodiment 10 ~ 13
Embodiment 15 ~ 18
The positive white-light optics performance index contrast of table 1
Data can find out that when colour temperature was the 5500K left and right sides, under the suitable situation of color rendering index, Ra was about 82 from table, and embodiment 1 ~ 5 all has remarkable lifting than the light efficiency of Comparative Examples 1, and the lifting amplitude reaches more than 8%.
The contrast of table 2 warm white optical property index
Data can find out that when colour temperature was the 3500K left and right sides, under the suitable situation of color rendering index, Ra was about 82 from table, and embodiment 6 ~ 9 all has remarkable lifting than the light efficiency of Comparative Examples 2, and the lifting amplitude reaches more than 12%.
The contrast of table 3 warm white optical property index
Data can be found out from table, and when colour temperature was the 3500K left and right sides, when the suitable light efficiency, color rendering index all had significantly and promotes embodiment 7 ~ 12 than Comparative Examples 1.
The test result of consolidated statement 1, table 2 and table 3 can find out that white LED light source of the present invention also can obtain higher light-emitting efficiency when significantly promoting color rendering index.
Claims (7)
1. a white LED light source comprises the bowl cup, is arranged on the blue-light LED chip of bowl cup bottom and yellow-green fluorescence powder and the red fluorescence powder that places the blue-light LED chip top;
It is characterized in that the yellow-green fluorescence powder places the top of red fluorescence powder;
The yellow-green fluorescence powder is selected from a kind of in following two kinds of fluorescent material:
(1) (Lu
1-c-(a+b)/3A ＇
c)
3Al
5O
12: Ce
a, A "
b, A ＇ is at least a among La, Y, Gd or the Tb, A " and be at least a among Pr, Dy or the 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 a among Sc, Y, La, Cr or the 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 a kind of in following two kinds of fluorescent material:
(1) Ca
1-j-k-q-rY
jC ＇
kX
L-mP
mC "
nN
p: Eu
q, C
0 r, wherein, C ＇ is at least a among Sr, Ba, Sc, Li, Na or the K, X is at least a among B, Al or the Ga, wherein Al is necessary, C, and " be at least a among Si, V or the Nb, wherein Si is necessary, C
0At least a among Dy, Er, Tm or the 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, D ＇ is at least a among Ca, Sr or the Ba in the formula, wherein Sr is necessary, D, and " be at least a among C, Si or the Ge, wherein Si is necessary, D
0At least a among Ce, Pr, Nd, Sm, Dy, the Yb, 0.01≤x≤3,4≤y≤6, z=(2/3) x+ (4/3) y, 0.001≤t≤0.2,0≤s≤0.01;
Said yellow-green fluorescence powder emission main peak is 526～575nm, and the emission main peak of red fluorescence powder is 600～660nm; The mass ratio of yellow-green fluorescence 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 yellow-green fluorescence powder places the implementation of red fluorescence powder top to be: earlier red fluorescence powder and yellow-green fluorescence powder are dispersed in packaging plastic respectively, process red fluorescence arogel and yellow-green fluorescence arogel, the red fluorescence arogel is coated on the blue-light LED chip; After treating its drying, again the yellow-green fluorescence arogel is applied above it.
3. white LED light source as claimed in claim 2 is characterized in that, said packaging plastic is silica gel or epoxy resin.
4. white LED light source as claimed in claim 1; It is characterized in that; The yellow-green fluorescence powder places the implementation of red fluorescence powder top: the hyaline layer of being processed by transparent material is set above the blue-light LED chip in the bowl cup, red fluorescence powder is fixed on the hyaline layer uniformly, the yellow-green fluorescence powder is fixed to the surface of red fluorescence bisque again; Or on hyaline layer fixing yellow-green fluorescence bisque, fixing red fluorescence bisque below hyaline layer.
5. white LED light source as claimed in claim 4 is characterized in that, described hyaline layer be the plane or cambered surface.
6. white LED light source as claimed in claim 1; It is characterized in that; The yellow-green fluorescence powder places the implementation of red fluorescence powder top to be: respectively red fluorescence powder and yellow-green fluorescence 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 last at following yellow-green fluorescence muffin by the red fluorescence muffin, place the chip top.
7. like claim 4 or 5 or 6 described white LED light sources; It is characterized in that described transparent material is selected from glass, pottery, quartz, polymethyl methacrylate, Merlon, polyethylene, mylar, polyamide, organosilicon or epoxy resin.
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