CN1547266A - Method for generating source of white light in secondary laser mode and white light luminescence component - Google Patents
Method for generating source of white light in secondary laser mode and white light luminescence component Download PDFInfo
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- CN1547266A CN1547266A CNA2003101213149A CN200310121314A CN1547266A CN 1547266 A CN1547266 A CN 1547266A CN A2003101213149 A CNA2003101213149 A CN A2003101213149A CN 200310121314 A CN200310121314 A CN 200310121314A CN 1547266 A CN1547266 A CN 1547266A
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Abstract
The invention is a method for using the secondary laser method to generate the white light source, it uses light source which can emit out ultraviolet and purple light (wavelength is 360-420nm), such as the illuminant diode (LED) and radium (LD), excites the blue fluorescence powder to emit out the primary excited light spectrum of the wideband whose main peak is blue light, then, the primary excited light spectrum excites the yellow fluorescence powder whose stage energy is lower, the secondary excited light spectrum can be emitted out whose main peak is yellow, through adjusting the proportion of the two kinds of fluorescence powder, the primary excited light spectrum and the secondary excited light spectrum can generate the complementary effect, and generate the whole spectrum white light; additional, there also can add in the red fluorescence powder and the green fluorescence powder excited by the ultraviolet light or the purple light, in order to adjust the color and the color temperature of the white light, and it can adjust the light source of other different color.
Description
Technical field
The present invention relates to a kind of method that produces white light source in the secondary laser mode, relate in particular to a kind of white-light emitting assembly that radiates the high-purity white light source, utilization can be radiated the chip of wavelength 360～420nm ultraviolet light or purple light as light source, excite to be coated on this above chip but be mixed with the encapsulating material of blue-fluorescence powder and yellow fluorescent powder prescription, and radiate highly purified white light source.
Background technology
By present employed conventional light source,,, be eliminate to change into to have the new light sources product that high-energy source efficient meets environmental protection condition again based on saving the energy and the purpose that meets environmental protection condition since shortcomings such as thermal radiation, heavy metal pollution and high power consumption are arranged in the use.
And utilize light-emitting diode (LED) or the laser made white-light emitting sources of luminescence component such as (LD), reach 100,000 hours useful life, not only power saving but also can save the energy, have again that volume is little, answer speed is fast, weatherability is good, good, the colour temperature of cracky, color rendering is not near speciality such as sunlights, be used on many applicable occasions, especially can reduce thermal radiation pollutes, with do not have heavy metal pollutions such as mercury, conform with environmental requirement fully, so be acknowledged as the main lighting source of 21st century.
The manufacture in early stage white-light emitting source, White LED s for example is coated on the blue LED and makes by the phosphor of the coloured light that will turn to be yellow, but the color and luster that is produced is not good; Perhaps, form luminescence component jointly with red light emitting diodes (RED LED), blue LED (BLUE LED) and green LED (GREEN LED), utilize the Red mixed light and form white light, but because of the driving voltage difference of use red light emitting diodes, blue LED and green LED, so have design of drive circuit complexity, power consumption height and the more high shortcoming of cost.
And day inferior (Nichia) company at first proposes with InGaN (InGaN) blue light that LED was produced in the 6th, 069, No. 440 patents of the U.S. that is had, and excites the yttrium-aluminium-garnet (Y that can send sodium yellow
3Al
5O
12, Yttrium Aluminum Garnet, YAG) phosphor powder, utilize blue light and gold-tinted mixed light after, to obtain high efficiency white light source.
But, when the wavelength of light source is lower than 420nm when following, lasing efficiency for the YAG phosphor powder is not good, and, InGaN (InGaN) blue light that LED produced, its optimum efficiency is about wavelength 400nm, therefore, excite the YAG phosphor powder with InGaN (InGaN) blue light that LED was produced, in fact also can't obtain high efficiency white light source.In other words, day the 6th, 069, No. 440 patents of inferior (Nichia) U.S. that company had, and be not suitable for light source about wavelength 400nm.
In order to improve above-mentioned shortcoming, the U.S. the 6th that unusual electrical equipment company (General Electric Company) is being had, 255, in No. 670 patents, excitated red, green with ultraviolet leds, the blue three kinds of phosphor powders of exposure, utilization is sent redness, green, blue three primary colors mixed light and is formed white light, but the light source about wavelength 400nm, lasing efficiency for red fluorescent powder is still not good, therefore, U.S. the 6th, 255 of being had of unusual electrical equipment company, No. 670 patents also are not suitable for the light source about wavelength 400nm.
Summary of the invention
Main purpose of the present invention is promptly disclosing the light source of a kind of method that produces white light source in the secondary laser mode about applicable to wavelength 400nm, with purple light or ultraviolet light-emitting diodes (LED) or laser (LD) as light source, radiate purple light or ultraviolet light that wave-length coverage is 360～420nm, excite first kind of blue-fluorescence powder, send with blue light is an exciting light frequency spectrum of main crest, utilize this exciting light frequency spectrum, can excite second kind of yellow fluorescent powder, send with gold-tinted is the secondary excitation optical spectrum of main crest, make exciting light frequency spectrum and secondary excitation optical spectrum through behind the mixed light, promptly form the white-light emitting source; So disclosed use produces the method for white light source in the secondary laser mode, can improve the U.S. the 6th, 069, No. 440 and the 6th, 255, No. 670 patents are not suitable for the shortcoming of the light source about wavelength 400nm.
Secondary objective of the present invention is promptly disclosing a kind of white-light emitting assembly that radiates the high-purity white light source, constituted by chip that is radiated wavelength 360～420nm purple light or ultraviolet light and the resin-encapsulated layer that is coated on this chip, utilize purple light or ultraviolet light chip to radiate purple light or the ultraviolet light of wavelength 360～420nm, in the secondary laser mode, excite the phosphor powder material (Phosphors) in the resin-encapsulated layer under being blended in to radiate blue light and gold-tinted, produce white light via the mixed light process again.
Another object of the present invention, gets and adds and can be used for adjusting the white-light emitting character that comprises color rendering and colour temperature by ultraviolet light or purple light excited red fluorescent powder body or green fluorescent powder in affiliated resin-encapsulated layer promptly disclosing a kind of white-light emitting assembly.
With the light efficiency function, under the condition of photopic vision, be the green-yellow light of 555nm with the wavelength, its light efficiency value maximum, therefore, utilize the chip that is radiated short wavelength light source, when exciting phosphor powder material (Phosphors), can radiate long wavelength's optical spectrum, and the effect of laser is preferable; And, when the wavelength of light source is healed short, the efficient of its power conversion is then higher, so the present invention excites blue light fluorescent powder with purple light or ultraviolet source, making blue light fluorescent powder radiate with blue light is the optical spectrum of main crest, use exciting gold-tinted fluorescent powder again, making gold-tinted fluorescent powder radiate with gold-tinted is the optical spectrum of main crest, can obtain best light conversion efficiency.
The disclosed method that produces white light source in the secondary laser mode, its method and principle are as shown in Figure 1, and white-light emitting assembly 10 shown in Figure 2, it is the practical application of this method invention, be can radiate ultraviolet light optical spectrum as shown in Figure 3, or the spectral ultraviolet light of purple light shown in Figure 4 or purple light chip 20 are luminescence component, also be, must select ultraviolet light or purple-light LED (LED) or ultraviolet light or the purple light laser (LD) of wavelength in 360～420nm scope for use is light source, the ultraviolet light or the purple light 25 that utilize ultraviolet light or purple light chip 20 to be radiated, excite a kind of blue-fluorescence powder 40 prescriptions, make blue-fluorescence powder 40 of the present invention radiated as Fig. 5 or shown in Figure 6 be exciting light frequency spectrum of broadband (broadbandspectrum) (first spectrum) of main crest with blue light 45, once excite spectral blue light 45 by this again, excite a kind of yellow fluorescent powder 50 prescriptions, make yellow fluorescent powder 50 of the present invention radiated as shown in Figure 9 be broadband (broadband spectrum) the secondary excitation optical spectrum (second spectrum) of main crest with gold-tinted 55, two kinds of blue-fluorescence powders 40 and yellow fluorescent powder 50 a prescriptions exciting light wave band radiating out (promptly thus, with blue light 45 is main crest) and the secondary excitation optical band is (promptly, with gold-tinted 55 is crest), can produce complementary mixed light effect, so can emit the high-purity white light 60 that is bordering on the full spectrum of RGB triband as shown in figure 10.
This kind produces the method for white light 60 with short wavelength light source, what be that the present invention invents produces the method for white light source in the secondary laser mode, and the white light 60 that generates by this method invention institute mixed light, for the light source near sunlight, in normal lighting, the utmost point meets the demand of human body, therefore, can overcome known techniques and excite red, green, blue three look fluorescent powders, when forming the three-wavelength mixed light, the not good shortcoming of mixed light inequality and brightness take place easily with purple light or ultraviolet source.
Blue-fluorescence powder 40 prescriptions used in the present invention are from Sr
10(PO
4)
6Cl
12: Eu
2+, Ca
10(PO
4)
6Cl
12: Eu
2+, Ba
10(PO
4)
6Cl
12: Eu
2+, Sr
5(PO
4)
3Cl:Eu
2+, and BaMgAl
10O
17: Eu
2+, Mn
2+Colony in select wherein a kind of; Can absorb all or part of purple light or the ultraviolet light 25 that is radiated by ultraviolet light or purple light chip 20.
When the present invention was light source with ultraviolet light chip 20, blue-fluorescence powder 40 of the present invention excited via the ultraviolet light 25 that is radiated, radiated as shown in Figure 5 be exciting light frequency spectrum of broadband of main crest with blue light 45.
When the present invention was light source with purple light chip 20, blue-fluorescence powder 40 of the present invention excited via the purple light 25 that is radiated, radiated as shown in Figure 6 be exciting light frequency spectrum of broadband of main crest with blue light 45.
Yellow fluorescent powder 50 prescriptions used in the present invention are from Y
3Al
5O
12: Ce
3+, Y
3Ga
5O
12: Ce
3+, Gd
3Al
5O
12: Ce
3+, and Gd
3Ga
5O
12: Ce
3+Colony in select wherein a kind of; As shown in Figures 7 and 8, yellow fluorescent powder 50 prescriptions of the present invention, for exciting of purple light or ultraviolet light 25, its laser effect is not good, but, can absorb all or part of blue light 45 of being emitted by blue-fluorescence powder 40.
When the present invention is light source with ultraviolet light chip 20, ultraviolet light 25 excitated blue fluorescent powders 40 radiate blue light 45, and the blue light 45 that is radiated excites yellow fluorescent powder 50 of the present invention again, make its radiate again as shown in Figure 9 be the broadband secondary excitation optical spectrum of main crest with gold-tinted 55.
In view of the above, only need to adjust the composition and the usage ratio of blue-fluorescence powder 40 prescriptions used in the present invention and yellow fluorescent powder 50 prescriptions, just can arrange in pairs or groups the easily purple light or the ultraviolet light chip 20 of different wave length, and reach the purpose that produces white light 60 light sources.
And, by composition and the usage ratio of adjusting blue-fluorescence powder 40 prescriptions and yellow fluorescent powder 50 prescriptions, can adjust luminosities such as the color rendering of white light 60 and colour temperature easily; In addition,, can adjust the colour temperature and the coloured light of white light 60 easily, or white light 60 is adjusted to the light source of other different color light by green fluorescent powder and the red fluorescent powder body that other adding can be excited by ultraviolet light or purple light 25.
The red fluorescent powder body prescription that the present invention is selected is from Y
2O
2S:Eu
2+, Bi
3+, YVO
4: Eu
2+, Bi
3+, SrS:Eu
2+, SrY
2S
4: Eu
2+, CaLaS
4: Ce
3+, CaS:Eu
2+, and SrS:Eu
2+Colony in select wherein a kind of.
And the selected green fluorescent powder of the present invention is from BaMg
2Al
16O
27: Eu
2+, Mn
2+, YBO
3: Ce
3+, Tb
3+, SrAl
2S
4: Eu
2+, BaAl
2S
4: Eu
2+, CaAl
2S
4: Eu
2+, SrGa
2S
4: Eu
2+, BaGa
2S
4: Eu
2+, and CaGa
2S
4: Eu
2+Colony in select wherein a kind of.
Description of drawings
Fig. 1 produces the flow chart of white light for the present invention utilizes the secondary laser mode.
Fig. 2 utilizes the secondary laser mode to produce the structure chart of white light for white-light emitting assembly 10 of the present invention.
Fig. 3 for the present invention with ultraviolet light chip 20 during as light source, the ultraviolet light optical spectrum that it is released.
Fig. 4 for the present invention with purple light chip 20 during as light source, the purple light optical spectrum that it is released.
When Fig. 5 was light source for the present invention with ultraviolet light chip 20, ultraviolet excitation blue-fluorescence powder 40 radiates were exciting light frequency spectrum of broadband of main crest with blue light.
When Fig. 6 was light source for the present invention with purple light chip 20, purple light excited blue-fluorescence powder 40 radiates were exciting light frequency spectrum of broadband of main crest with blue light.
When Fig. 7 is light source for the present invention with ultraviolet light chip 20, the gold-tinted frequency spectrum that the yellow fluorescent powder 50 of ultraviolet excitation is released.
When Fig. 8 is light source for the present invention with purple light chip 20, the gold-tinted optical spectrum that purple light excited yellow fluorescent powder 50 is released.
When Fig. 9 was light source for the present invention with ultraviolet light chip 20, ultraviolet excitation blue-fluorescence powder 40 radiated blue light 45, and this blue light 45 excites yellow fluorescent powder 50 to radiate the secondary excitation optical spectrum of gold-tinted 55 again.
Figure 10 produces the optical spectrum of white light in ultraviolet light secondary laser mode for the present invention.
Figure 11 is second kind of example structure figure of white-light emitting assembly 10 of the present invention.
Figure 12 is the third example structure figure of white-light emitting assembly 10 of the present invention.
Symbol description
10 white-light emitting assemblies, 20 ultraviolet lights or purple light chip
25 ultraviolet lights or purple light 30 resin-encapsulated layers
31 first coating layers, 32 second coating layers
33 the 3rd coating layers, 35 encapsulating materials
40 blue-fluorescence powders, 45 blue lights
50 yellow fluorescent powder 55 gold-tinteds
60 white lights
Embodiment
Please refer to Fig. 2, the present invention produces the method for white light source in the secondary laser mode, can be applied on the white-light emitting assembly 10, and produce highly purified white light source, so, can be applicable to provide purposes such as room lighting, special lighting, LCD backlight, scanner, facsimile machine, mobile phone and military illumination.
White-light emitting assembly 10 of the present invention, but ultraviolet light or purple light chip 20 by emit wavelength 360-420nm purple light or ultraviolet light, and be coated on 30 formation of resin-encapsulated layer on this ultraviolet light or the purple light chip 20, wherein, this resin-encapsulated layer 30 is to mix blue-fluorescence powder 40 and yellow fluorescent powder 50 by encapsulating material 35, perhaps, further be mixed with red fluorescent powder body, green fluorescent powder again, form through hot curing or photo-hardening.
And this blue-fluorescence powder 40 is from Sr
10(PO
4)
6Cl
12: Eu
2+, Ca
10(PO
4)
6Cl
12: Eu
2+, Ba
10(PO
4)
6Cl
12: Eu
2+, Sr
5(PO
4)
3Cl:Eu
2+, and BaMgAl
10O
17: Eu
2+, Mn
2+Colony in select wherein a kind of; This yellow fluorescent powder 50 is from Y
3Al
5O
12: Ce
3+, Y
3Ga
5O
12: Ce
3+, Gd
3Al
5O
12: Ce
3+, and Gd
3Ga
5O
12: Ce
3+Colony in select wherein a kind of; This green fluorescent powder is from BaMg
2Al
16O
27: Eu
2+, Mn
2+, YBO
3: Ce
3+, Tb
3+, SrAl
2S
4: Eu
2+, BaAl
2S
4: Eu
2+, CaAl
2S
4: Eu
2+, SrGa
2S
4: Eu
2+, BaGa
2S
4: Eu
2+, and CaGa
2S
4: Eu
2+Colony in select wherein a kind of; And this red fluorescent powder body is from Y
2O
2S:Eu
2+, Bi
3+, YVO
4: Eu
2+, Bi
3+, SrS:Eu
2+, SrY
2S
4: Eu
2+, CaLaS
4: Ce
3+, CaS:Eu
2+, and SrS:Eu
2+Colony in select wherein a kind of.
When encapsulating material 35, blue-fluorescence powder 40, yellow fluorescent powder 50, red fluorescent powder body, the formed prescription total weight of green fluorescent powder of white-light emitting assembly 10 is A, and the weight of encapsulating material 35 is the weight of E, blue-fluorescence powder 40 is that the weight of B, yellow fluorescent powder 50 is that the weight of Y, red fluorescent powder body is that the weight of R, green fluorescent powder is G, then the weight relationships between each composition satisfies E 〉=50%A; B+Y+R+G≤50%A; 5%A≤B≤40%A; 5%A≤Y≤40%A; 0.001%A≤R≤20%A; 0.0001%A≤G≤20%A.
Please refer to Figure 11, second kind of white-light emitting assembly 10 specific embodiment of the present invention, also blue-fluorescence powder 40 can be mixed with encapsulating material 35, coat earlier on ultraviolet light or the purple light chip 20, form first coating layer 31, after treating these first coating layer, 31 hot curings or photo-hardening, yellow fluorescent powder 50, blue-fluorescence powder 40, red fluorescent powder body, green fluorescent powder are mixed with encapsulating material 35, coat again on first coating layer 31, forming second coating layer 32, and carry out hot curing or photo-hardening.Perhaps, please refer to Figure 12, on second coating layer 32, be coated with the 3rd coating layer 33 that one deck is made of encapsulating material 35 again, and carry out hot curing or photo-hardening, and constitute the third white-light emitting assembly 10 specific embodiments of the present invention again.This kind coating method, can improve the transformation efficiency of 40 pairs of ultraviolet lights of blue-fluorescence powder or purple light, a small amount of unconverted ultraviolet light or purple light, can be again absorb or transform by the yellow fluorescent powder 50 of second coating layer 32, so can obtain preferable light conversion efficiency, ultraviolet light fully is converted to the efficient height of visible light.
Wherein, second kind and first coating layer 31 of the third white-light emitting assembly 10 and the composition of second coating layer 32, satisfy following weight relationships:
First coating layer 31: is A by encapsulating material 35 with blue-fluorescence powder 40 formed prescription total weights, and the weight of encapsulating material 35 be the weight of E, blue-fluorescence powder 40 is B, then E 〉=50%A; 5%A≤B≤50%A;
Second coating layer 32: by encapsulating material 35, yellow fluorescent powder 50, red fluorescent powder body and the formed prescription total weight of green fluorescent powder is X, encapsulating material and the weight of encapsulating material 35 are that the weight of E, yellow fluorescent powder 50 is that the weight of Y, red fluorescent powder body is that the weight of R, green fluorescent powder is G, then E 〉=50%X; Y+R+G≤50%X; 5%X≤Y≤50%X; 0.001%X≤R≤20%X; 0.0001%X≤G≤20%X.
Claims (10)
1, a kind of method that produces white light source in the secondary laser mode, the luminescence component that its utilization can be emitted purple light or ultraviolet light is light source, the emit wavelength scope is purple light or the ultraviolet light of 360-420nm, excite first kind of blue-fluorescence powder earlier, send the spectrum of once giving out light, utilize this spectrum of once giving out light, excite second kind of yellow fluorescent powder again, send the secondary spectrum of giving out light, once give out light spectrum and secondary of order given out light behind the spectrum mixed light, and formation white-light emitting source.
2, as claimed in claim 1ly produce the method for white light source in the secondary laser mode, wherein, the luminescence component as light source uses is purple light or ultraviolet light-emitting diodes.
3, as claimed in claim 1ly produce the method for white light source in the secondary laser mode, wherein, the luminescence component as light source uses is purple light or ultraviolet light laser.
4, as claimed in claim 1ly produce the method for white light source, utilize the ratio of adjusting blue-fluorescence powder and yellow fluorescent powder, can adjust the colour temperature and the color rendering of white light source in the secondary laser mode.
5, as claimed in claim 1ly produce the method for white light source, utilize to add red fluorescent powder body and green fluorescent powder, can be adjusted to the light source of different colour systems in the secondary laser mode.
6, a kind of white-light emitting assembly, produce white light source in the secondary laser mode, but constituted by the chip of emit wavelength 360-420nm purple light or ultraviolet light and the resin-encapsulated layer that is coated on this chip, wherein, this resin-encapsulated layer is made of encapsulating material mixing blue-fluorescence powder and yellow fluorescent powder, and this blue-fluorescence powder is from Sr
10(PO
4)
6Cl
12: Eu
2+, Ca
10(PO
4)
6Cl
12: Eu
2+, Ba
10(PO
4)
6Cl
12: Eu
2+, Sr
5(PO
4)
3Cl:Eu
2+, and BaMgAl
10O
17: Eu
2+, Mn
2+Colony in select wherein a kind of and should yellow fluorescent powder be from Y
3Al
5O
12: Ge
3+, Y
3Ga
5O
12: Ce
3+, Gd
3Al
5O
12: Ce
3+, and Gd
3Ga
5O
12: Ce
3+Colony in select wherein a kind of.
7, white-light emitting assembly as claimed in claim 6 wherein, further be mixed with the green fluorescent powder in this resin-encapsulated layer, and this green fluorescent powder is from BaMg
2Al
16O
27: Eu
2+, Mn
2+, YBO
3: Ce
3+, Tb
3+, SrAl
2S
4: Eu
2+, BaAl
2S
4: Eu
2+, CaAl
2S
4: Eu
2+, SrGa
2S
4: Eu
2+, BaGa
2S
4: Eu
2+, and CaGa
2S
4: Eu
2+Colony in select wherein a kind of.
8, as claim 6 or 7 described white-light emitting assemblies, wherein, further be mixed with the red fluorescent powder body in this resin-encapsulated layer, and this red fluorescent powder body is from Y
2O
2S:Eu
2+, Bi
3+, YVO
4: Eu
2+, Bi
3+, SrS:Eu
2+, SrY
2S
4: Eu
2+, CaLaS
4: Ce
3+, CaS:Eu
2+, and SrS:Eu
2+Colony in select wherein a kind of.
9, white-light emitting assembly as claimed in claim 8, wherein, the total weight of this resin-encapsulated layer is A, and the weight of encapsulating material is the weight of E, blue-fluorescence powder is that the weight of B, yellow fluorescent powder is that the weight of Y, red fluorescent powder body is that the weight of R, green fluorescent powder is G, make the weight relationships between each composition, meet the following conditions
E≥50％A；
B+Y+R+G≤50％A；
5％A≤B≤40％A；
5％A≤Y≤40％A；
0.001%A≤R≤20%A; And
0.0001％A≤G≤20％A。
10, white-light emitting assembly as claimed in claim 8, wherein, this resin-encapsulated layer is two layer laminate structures, first coating layer is the coating layer that is made of encapsulating material mixing blue-fluorescence powder, be coated on this chip, second coating layer is to mix the coating layer that yellow fluorescent powder, blue-fluorescence powder, red fluorescent powder body and green fluorescent powder are constituted by encapsulating material, is coated on first coating layer; Wherein, the total weight of first coating layer is A, and the weight of affiliated encapsulating material is the weight B of E and blue-fluorescence powder, and weight relationships between the two satisfies the condition of E 〉=50%A and 5%A≤B≤50%A; And, the total weight of second coating layer is X, and the weight of affiliated encapsulating material is the weight of E, blue-fluorescence powder is that the weight of B, yellow fluorescent powder is that the weight of Y, red fluorescent powder body is that the weight of R, green fluorescent powder is G, make the weight relationships between each composition, meet the following conditions
E≥50％X；
B+Y+R+G≤50％X；
0％X≤B≤5％X；
5％X≤Y≤50％X；
0.001%X≤R≤20%X; And
0.0001％X≤G≤20％X。
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|---|---|---|---|
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2003
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