CN102127436A - Mixed fluorescent powder and preparation method of white light LED - Google Patents
Mixed fluorescent powder and preparation method of white light LED Download PDFInfo
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- CN102127436A CN102127436A CN201010559742XA CN201010559742A CN102127436A CN 102127436 A CN102127436 A CN 102127436A CN 201010559742X A CN201010559742X A CN 201010559742XA CN 201010559742 A CN201010559742 A CN 201010559742A CN 102127436 A CN102127436 A CN 102127436A
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- white light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention discloses mixed fluorescent powder and a preparation method of white light LED. The mixed fluorescent powder comprises the following components in percentage by weight: 50 to 75 percent of ultraviolet light-excited red fluorescent powder and 25 to 50 percent of ultraviolet light-excited green fluorescent powder. The mixed fluorescent powder provided by the invention can be excited by ultraviolet light or purple light in the spectrum of a blue light LED to emit green light and red light, the emitted green light and red light are mixed with blue light to form white light, and thus, the light utilization rate of the blue light LED is improved; and the color performance of the white light can be controlled in a large range. Meanwhile, the invention also discloses a preparation method of white light LED. In the method, after being prepared, the mixed fluorescent powder is mixed to form fluorescent gel, the fluorescent gel is coated on the blue light LED, and thus, the blue light LED emits white light. The method is simple and convenient.
Description
Technical field
The present invention relates to LED encapsulation technology field, relate in particular to the preparation method of a kind of mixed fluorescent powder and white light LEDs.
Background technology
Photodiode (LED, Light Emitting Diode) is a kind of semi-conductor solid luminescence device, and it utilizes semiconductor PN as luminescent material, can directly electricity be converted to light.After the two ends of semiconductor PN add forward voltage, inject the minority carrier of PN junction and majority carrier and take place compoundly, emit superfluous energy and cause photo emissions, directly send the light that color is red, orange, yellow, green, blue, blue, purple.
Compare with the traditional lighting light source, white light LEDs has lot of advantages, for example: volume is little, less energy consumption, response is fast, the life-span is long, pollution-free etc., thereby make its focus that becomes present research, be widely used in the lighting, and be considered to light source of future generation.
At present, the method for realization white light LEDs mainly contains following several:
(1) adopts red, green, blue three-primary color LED illuminated in combination, i.e. multicore sheet white light LEDs;
(2) adopt blue-light LED chip and yellow fluorescent powder, the gold-tinted dichromatism complementation by blue light and yellow fluorescent powder send obtains white light;
(3) the near ultraviolet excitation three primary colors fluorescent powder that utilizes the ultraviolet LED chip to send obtains white light.
The white light LEDs of above-mentioned first method preparation has that efficient height, colour temperature are controlled, color developing advantage preferably, yet this method needs complicated pilot circuit, cost height, and exists because three primary colours light decay difference causes the colour temperature problem of unstable.
The white light LEDs that above-mentioned back two kinds of methods obtain all needs to use fluorescent material, so be referred to as fluorescent material conversion LED (PC-LED, Phosphor Converted Light Emitting Diode).PC-LED compares with multicore sheet white light LEDs, has outstanding advantage at aspects such as pilot circuit, production cost, heat radiations, thereby occupy dominant position on present LED produce market.In PC-LED, fluorescent material is to make led chip realize the critical material of white-light illuminating.
Yet efficient height, preparation are simple though the white light LEDs of above-mentioned second method preparation has, temperature stability better, color developing advantage preferably, the problem that have still that consistence is poor, colour temperature and angle changes.
Though the white light LEDs of above-mentioned the third method preparation have color developing good, prepare simple advantage, yet also exist led chip efficient low, have UV-light to reveal and the not high problem of fluorescent material temperature stability.And, at present, to use at most, technology is the most sophisticated to be blue-ray LED; And the luminous intensity of ultraviolet leds is extremely low, does not almost have use value.
Thereby, how to improve the light utilization efficiency of blue-light LED chip, improve the color developing of white light LEDs, become the technical problem that present industry is needed solution badly.
Summary of the invention
The object of the present invention is to provide the preparation method of a kind of mixed fluorescent powder and white light LEDs, with the light utilization efficiency of raising led chip, and the color developing of white light LEDs.
For addressing the above problem, the present invention proposes a kind of mixed fluorescent powder, and this mixed fluorescent powder is grouped into by following one-tenth, and the weight ratio of each composition is:
The ultraviolet excitation red light fluorescent powder: 50%～75%, ultraviolet excitation green light fluorescent powder: 25%～50%.
Optionally, described ultraviolet excitation red light fluorescent powder consists of Y
2O
3: Eu
3+, Bi
3+
Optionally, described ultraviolet excitation green light fluorescent powder consists of Ca
8Mg (SiO
4)
4Cl
2: Eu
2+, Mn
2+
Optionally, this mixed fluorescent powder excitation wavelength range is 360nm～470nm.
Simultaneously, for addressing the above problem, the present invention also proposes a kind of preparation method of white light LEDs, and this method comprises the steps:
Ultraviolet excitation red light fluorescent powder, ultraviolet excitation green light fluorescent powder and fluorescent material glue are provided;
The preparation mixed fluorescent powder, wherein said mixed fluorescent powder is grouped into by following one-tenth, and the weight ratio of each composition is: the ultraviolet excitation red light fluorescent powder: 50%～75%, ultraviolet excitation green light fluorescent powder: 25%～50%; Described mixed fluorescent powder and described fluorescent material are modulated with glue, made fluorescent glue;
Described fluorescent glue is applied on the blue-light LED chip.
Optionally, described ultraviolet excitation red light fluorescent powder consists of Y
2O
3: Eu
3+, Bi
3+
Optionally, described ultraviolet excitation green light fluorescent powder consists of Ca
8Mg (SiO
4)
4Cl
2: Eu
2+, Mn
2+
Optionally, this fluorescent material excitation wavelength range is 360nm～470nm.
Optionally, described fluorescent glue is applied on the blue-light LED chip realized by point gum machine.
The present invention makes it compared with prior art owing to adopt above technical scheme, has following advantage and positively effect:
1) mixed fluorescent powder provided by the invention utilizes UV-light or the purple light in the blue-ray LED spectrum, excites it to produce green glow and ruddiness, and green glow that is produced and ruddiness and blue light form white light, thereby has improved the light utilization efficiency of blue-ray LED;
2) the present invention can realize controlling in a big way the color developing of white light by the ultraviolet excitation red light fluorescent powder is rationally mixed with the ultraviolet excitation green light fluorescent powder.
Description of drawings
The preparation method's of the white light LEDs that Fig. 1 provides for the embodiment of the invention flow chart of steps.
Embodiment
Below in conjunction with the drawings and specific embodiments the mixed fluorescent powder of the present invention's proposition and the preparation method of white light LEDs are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only be used for conveniently, the purpose of the aid illustration embodiment of the invention lucidly.
Core concept of the present invention is, a kind of mixed fluorescent powder is provided, and this mixed fluorescent powder is grouped into by following one-tenth, and the weight ratio of each composition is: the ultraviolet excitation red light fluorescent powder: 50%～75%, and ultraviolet excitation green light fluorescent powder: 25%～50%; Mixed fluorescent powder provided by the invention can utilize UV-light or the purple light in the blue-ray LED spectrum, excites it to produce green glow and ruddiness, and green glow that is produced and ruddiness and blue light form white light, thereby has improved the light utilization efficiency of blue-ray LED; And can realize controlling in a big way the color developing of white light; Simultaneously, the present invention also provides a kind of preparation method of white light LEDs, and this method is modulated into fluorescent glue with it after being mixed with mixed fluorescent powder, and is coated on the blue-ray LED, thereby makes blue-ray LED send white light, and this method is simple and convenient.
The mixed fluorescent powder that the embodiment of the invention provides is grouped into by following one-tenth, and the weight ratio of each composition is:
The ultraviolet excitation red light fluorescent powder: 50%～75%, ultraviolet excitation green light fluorescent powder: 25%～50%.
Further, described ultraviolet excitation red light fluorescent powder consists of Y
2O
3: Eu
3+, Bi
3+
Further, described ultraviolet excitation green light fluorescent powder consists of Ca
8Mg (SiO
4)
4C1
2: Eu
2+, Mn
2+
Further, this mixed fluorescent powder excitation wavelength range is 360nm～470nm; This is because the light that blue-ray LED sends except blue light, also can exist a spot of purple light and UV-light etc.Wherein, wavelength is a blue light at the light of 450nm～470nm, wavelength is UV-light and purple light at the light of 360nm～450nm, and the embodiment of the invention utilizes UV-light and the purple light excited mixed fluorescent powder in the blue-ray LED spectrum to glow and green glow, simultaneously the blue light synthesize white light that sends with blue-ray LED; Thereby made full use of purple light and UV-light in the blue-ray LED spectrum, realized that the blue-ray LED spectrographic rationally utilizes, and has improved the light utilization efficiency of blue-ray LED; And, can realize controlling in a big way the color developing of white light by the blending ratio of control ultraviolet excitation red light fluorescent powder and ultraviolet excitation green light fluorescent powder.
Please refer to Fig. 1, the preparation method's of the white light LEDs that Fig. 1 provides for the embodiment of the invention flow chart of steps, as shown in Figure 1, the preparation method of the white light LEDs that the embodiment of the invention provides comprises the steps:
S101, provide ultraviolet excitation red light fluorescent powder, ultraviolet excitation green light fluorescent powder and fluorescent material glue; Wherein, described ultraviolet excitation red light fluorescent powder can produce ruddiness under the exciting of UV-light or purple light, the ultraviolet excitation green light fluorescent powder can produce green glow under the exciting of UV-light or purple light, described fluorescent material glue is that a kind of being specifically designed to is bonded to the aliphatic epoxy resin on the led chip and the mixture of organosilicon epoxy resin with fluorescent material;
S102, preparation mixed fluorescent powder, wherein said mixed fluorescent powder is grouped into by following one-tenth, and the weight ratio of each composition is: the ultraviolet excitation red light fluorescent powder: 50%～75%, ultraviolet excitation green light fluorescent powder: 25%～50%;
S103, described mixed fluorescent powder and described fluorescent material are modulated with glue, made fluorescent glue;
S104, described fluorescent glue is applied on the blue-light LED chip.
Further, described ultraviolet excitation red light fluorescent powder consists of Y
2O
3: Eu
3+, Bi
3+
Further, described ultraviolet excitation green light fluorescent powder consists of Ca
8Mg (SiO
4)
4C1
2: Eu
2+, Mn
2+
Further, this fluorescent material excitation wavelength range is 360nm～470nm; This is because the light that blue-ray LED sends except blue light, also can exist a spot of purple light and UV-light etc.Wherein, wavelength is a blue light at the light of 450nm～470nm, wavelength is UV-light and purple light at the light of 360nm～450nm, and the embodiment of the invention utilizes UV-light and the purple light excited mixed fluorescent powder in the blue-ray LED spectrum to glow and green glow, simultaneously the blue light synthesize white light that sends with blue-ray LED; Thereby made full use of purple light and UV-light in the blue-ray LED spectrum, realized that the blue-ray LED spectrographic rationally utilizes, and has improved the light utilization efficiency of blue-ray LED; And, can realize controlling in a big way the color developing of white light by the blending ratio of control ultraviolet excitation red light fluorescent powder and ultraviolet excitation green light fluorescent powder.
Further, described fluorescent glue is applied on the blue-light LED chip realized by point gum machine; Particularly, at first blue-light LED chip is fixed on the support that band buckled, takes fluorescent glue to point gum machine, to carry out a glue then.
In sum, the invention provides a kind of mixed fluorescent powder, this mixed fluorescent powder is grouped into by following one-tenth, and the weight ratio of each composition is: the ultraviolet excitation red light fluorescent powder: 50%～75%, and ultraviolet excitation green light fluorescent powder: 25%～50%; Mixed fluorescent powder provided by the invention can utilize UV-light or the purple light in the blue-ray LED spectrum, excites it to produce green glow and ruddiness, and green glow that is produced and ruddiness and blue light form white light, thereby has improved the light utilization efficiency of blue-ray LED; And can realize controlling in a big way the color developing of white light; Simultaneously, the present invention also provides a kind of preparation method of white light LEDs, and this method is modulated into fluorescent glue with it after being mixed with mixed fluorescent powder, and is coated on the blue-ray LED, thereby makes blue-ray LED send white light, and this method is simple and convenient.
Obviously, those skilled in the art can carry out various changes and modification to invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. a mixed fluorescent powder is characterized in that, be grouped into by following one-tenth, and the weight ratio of each composition is:
The ultraviolet excitation red light fluorescent powder: 50%～75%, ultraviolet excitation green light fluorescent powder: 25%～50%.
2. mixed fluorescent powder as claimed in claim 1 is characterized in that, described ultraviolet excitation red light fluorescent powder consist of Y
2O
3: Eu
3+, Bi
3+
3. mixed fluorescent powder as claimed in claim 1 is characterized in that, described ultraviolet excitation green light fluorescent powder consist of Ca
8Mg (SiO
4)
4Cl
2: Eu
2+, Mn
2+
4. as each described mixed fluorescent powder of claim 1 to 3, it is characterized in that this mixed fluorescent powder excitation wavelength range is 360nm～470nm.
5. the preparation method of a white light LEDs is characterized in that, comprises the steps:
Ultraviolet excitation red light fluorescent powder, ultraviolet excitation green light fluorescent powder and fluorescent material glue are provided;
The preparation mixed fluorescent powder, wherein said mixed fluorescent powder is grouped into by following one-tenth, and the weight ratio of each composition is: the ultraviolet excitation red light fluorescent powder: 50%～75%, ultraviolet excitation green light fluorescent powder: 25%～50%;
Described mixed fluorescent powder and described fluorescent material are modulated with glue, made fluorescent glue;
Described fluorescent glue is applied on the blue-ray LED chip.
6. the preparation method of white light LEDs as claimed in claim 5 is characterized in that, described ultraviolet excitation red light fluorescent powder consist of Y
2O
3: Eu
3+, Bi
3+
7. the preparation method of white light LEDs as claimed in claim 5 is characterized in that, described ultraviolet excitation green light fluorescent powder consist of Ca
8Mg (SiO
4)
4Cl
2: Eu
2+, Mn
2+
8. as the preparation method of each described white light LEDs of claim 5 to 7, it is characterized in that this fluorescent material excitation wavelength range is 360nm～470nm.
9. the preparation method of white light LEDs as claimed in claim 5 is characterized in that, described fluorescent glue is applied on the blue-light LED chip realized by point gum machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010559742XA CN102127436A (en) | 2010-11-24 | 2010-11-24 | Mixed fluorescent powder and preparation method of white light LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010559742XA CN102127436A (en) | 2010-11-24 | 2010-11-24 | Mixed fluorescent powder and preparation method of white light LED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102127436A true CN102127436A (en) | 2011-07-20 |
Family
ID=44265714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010559742XA Pending CN102127436A (en) | 2010-11-24 | 2010-11-24 | Mixed fluorescent powder and preparation method of white light LED |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172921A (en) * | 2012-09-11 | 2013-06-26 | 佛山安亿纳米材料有限公司 | Bifunctional light conversion thin film and preparation method thereof |
| CN110970541A (en) * | 2018-09-29 | 2020-04-07 | 有研稀土新材料股份有限公司 | Semiconductor light source and optical device prepared by same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1289456A (en) * | 1998-11-30 | 2001-03-28 | 通用电气公司 | Light emitting device with phosphor composition |
| CN1464568A (en) * | 2002-06-13 | 2003-12-31 | 光宝科技股份有限公司 | A making process for white light light-emitting diode |
| CN101806430A (en) * | 2009-02-17 | 2010-08-18 | 福建省苍乐电子企业有限公司 | High-color rendering white-light LED |
-
2010
- 2010-11-24 CN CN201010559742XA patent/CN102127436A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1289456A (en) * | 1998-11-30 | 2001-03-28 | 通用电气公司 | Light emitting device with phosphor composition |
| CN1464568A (en) * | 2002-06-13 | 2003-12-31 | 光宝科技股份有限公司 | A making process for white light light-emitting diode |
| CN101806430A (en) * | 2009-02-17 | 2010-08-18 | 福建省苍乐电子企业有限公司 | High-color rendering white-light LED |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172921A (en) * | 2012-09-11 | 2013-06-26 | 佛山安亿纳米材料有限公司 | Bifunctional light conversion thin film and preparation method thereof |
| CN110970541A (en) * | 2018-09-29 | 2020-04-07 | 有研稀土新材料股份有限公司 | Semiconductor light source and optical device prepared by same |
| CN110970541B (en) * | 2018-09-29 | 2023-04-21 | 有研稀土新材料股份有限公司 | Semiconductor light source and optical device prepared by same |
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| PB01 | Publication | ||
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Application publication date: 20110720 |