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Preparation method of single-substrate fluorescent powder for white-light LEDs (light-emitting diodes)

A phosphor powder and a single technology, applied in the field of preparation of single matrix phosphor powder for white light LED, can solve the problem of difficulty in realizing white light emission, and achieve the effect of high crystal phase purity and uniform particle size

Inactive Publication Date: 2013-04-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most common of these is a single-matrix white light phosphor co-doped with two ions, such as Eu 2+ -Mn 2+ 、Ce 3+ -Mn 2+ etc., it is difficult to achieve white light emission with a single excited ion

Method used

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  • Preparation method of single-substrate fluorescent powder for white-light LEDs (light-emitting diodes)
  • Preparation method of single-substrate fluorescent powder for white-light LEDs (light-emitting diodes)
  • Preparation method of single-substrate fluorescent powder for white-light LEDs (light-emitting diodes)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An alkaline earth chlorosilicate-based white phosphor for white light LED, its chemical composition formula is Ca 2 SiO 3 Cl 2 :xTb 3+ , Where the value of x is 0.001.

[0026] 1) According to the stoichiometric ratio, calculate and synthesize 0.02mol Ca 2 SiO 3 Cl 2 :xTb 3+ The quality of the medicine needed: weigh 0.02mol anhydrous CaCl 2 , 0.02mol Ca(NO 3 ) 2 ·4H 2 O and Tb are weighed according to the molar amount of Tb as 0.00002mol 4 O 7 , Respectively measure 5ml absolute ethanol and 4.48ml ethyl silicate (TEOS). Tb 4 O 7 Dissolve in an appropriate amount of concentrated nitric acid solution with a weight concentration of 50 to 58%, and heat to 75°C until Tb 4 O 7 The powder is completely dissolved, the amount of nitric acid can dissolve Tb 4 O 7 Powder is suitable, then first use dilute NH with a concentration of 0.1mol / L 3 ·H 2 O adjust the pH value of the solution to pH=4, until white insoluble matter is about to appear, and finally add distilled water to 2~4ml to ...

Embodiment 2

[0030] An alkaline earth chlorosilicate-based white phosphor for white light LED, its chemical composition formula is Ca 2 SiO 3 Cl 2 :xTb 3+ , Where the value of x is 0.002.

[0031] 1) According to the stoichiometric ratio, calculate and synthesize 0.02mol Ca 2 SiO 3 Cl 2 :xTb 3+ The quality of the medicine needed: weigh 0.02mol anhydrous CaCl 2 , 0.02mol Ca(NO 3 ) 2 ·4H 2 O and Tb are weighed according to the molar amount of Tb as 0.00004mol 4 O 7 Measure 6ml absolute ethanol and 4.48ml ethyl silicate (TEOS) respectively. Tb 4 O 7 Dissolve in an appropriate amount of concentrated nitric acid solution with a weight concentration of 50 to 58%, and heat to 85°C until Tb 4 O 7 The powder is completely dissolved, the amount of nitric acid can dissolve Tb 4 O 7 Powder is suitable, and then first use dilute NH with a concentration of 0.1mol / L 3 ·H 2 O adjust the pH value of the solution to pH=5, until white insoluble matter is about to appear, and finally add distilled water to 2~4ml t...

Embodiment 3

[0035] An alkaline earth chlorosilicate-based white phosphor for white light LED, its chemical composition formula is Ca 2 SiO 3 Cl 2 :xTb 3+ , Where the value of x is 0.003.

[0036] 1) According to the stoichiometric ratio, calculate and synthesize 0.02mol Ca 2 SiO 3 Cl 2 :xTb 3+ The quality of the medicine needed: weigh 0.02mol anhydrous CaCl 2 , 0.02mol Ca(NO 3 ) 2 ·4H 2 O and Tb are weighed according to the molar amount of Tb as 0.00006mol 4 O 7 Measure 6ml absolute ethanol and 4.48ml ethyl silicate (TEOS) respectively. Tb 4 O 7 Dissolve in an appropriate amount of concentrated nitric acid solution with a weight concentration of 50~58%, and heat to 90℃ until Tb 4 O 7 The powder is completely dissolved, the amount of nitric acid can dissolve Tb 4 O 7 Powder is suitable, then first use dilute NH with a concentration of 0.1mol / L 3 ·H 2 O adjust the pH value of the solution to pH=5, until white insoluble matter is about to appear, and finally add distilled water to 2~4ml to form s...

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Abstract

The invention provides a preparation method of single-substrate fluorescent powder for white-light LEDs (light-emitting diodes), which comprises the following steps: after completely dissolving Tb4O7 in a concentrated nitric acid solution, regulating the pH value to 4-7 with ammonia water, sequentially adding anhydrous CaCl2, Ca(NO3)2.4H2O and anhydrous ethanol, uniformly stirring, adding a slow release agent citric acid solution, continuously stirring until the slow release agent is uniformly dispersed in the solution, adding ethyl silicate, and stirring to form a uniform and transparent solution; and regulating the pH value of the uniform and transparent solution to 6-8 with ammonia water to form a gel, drying the gel, grinding to form powder, putting the dry gel powder in a resistance furnace, and sintering in a weak reducing atmosphere. The preparation method provided by the invention implements activation of the Ca2SiO3Cl2 substrate to emit white light by using the single Tb<3+>.

Description

Technical field [0001] The invention relates to a preparation method of a single matrix fluorescent powder for white light LEDs, in particular to a preparation method of a single matrix fluorescent powder for white light LEDs. Background technique [0002] White light LED has attracted wide attention since its appearance. The lighting as a light source has the characteristics of environmental protection, energy saving, high efficiency, long life, easy maintenance, etc. It is known as surpassing incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps (High intensity dis-charge, HID's fourth-generation lighting source is the first choice of today's society in pursuit of a low-carbon economy. [0003] The realization of white light LED is mainly to use a combination of LED chip and phosphor powder, through which the short-wavelength light emitted by the chip is partially or completely converted into visible light, and finally compounded into white light. The blue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/61H01L33/50
CPCY02B20/181Y02B20/00
Inventor 宁青菊郭芳芳乔畅君李向龙史永胜于成龙
Owner SHAANXI UNIV OF SCI & TECH
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