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Blue fluorescent powder for near ultraviolet LED and preparation thereof

A blue phosphor, near-ultraviolet technology, applied in chemical instruments and methods, luminescent materials, alkaline earth metal silicates, etc. Small, energy saving, good crystallinity

Inactive Publication Date: 2009-05-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphor powder prepared by spray pyrolysis has the advantages of uniform particle size distribution, high crystallinity, easy operation, and high production efficiency. However, cavities are prone to appear in the prepared phosphor particles, and it is easy to collapse and break after high-temperature roasting, which affects the use effect.

Method used

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  • Blue fluorescent powder for near ultraviolet LED and preparation thereof
  • Blue fluorescent powder for near ultraviolet LED and preparation thereof
  • Blue fluorescent powder for near ultraviolet LED and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the chemical formula (Ca 0.98 Eu 0.02 )MgSi 2 o 6 Weigh Ca(NO 3 ) 2 4H 2 O(A.R.)0.98mol, Mg(NO 3 ) 2 ·6H 2 O(A.R.)1mol, H 2 SiO 3 (A.R.)2mol, Eu 2 o 3 (A.R.) 0.01mol and precipitant NH 4 HCO 3 (A.R.) 4mol; Then take respectively the surfactant polyethylene glycol and the flux H of the total mass of the above medicines of 0.2wt%. 3 BO 3 ; First weigh the Eu 2 o 3 Dissolve with an appropriate amount of nitric acid, add an appropriate amount of deionized water and heat to 25°C; add Ca(NO 3 ) 2 4H 2 O, Mg(NO 3 ) 2 ·6H 2 O, H 2 SiO 3 , polyethylene glycol, stirring simultaneously, and adding the precipitating agent several times, adjusting the pH of the solution to 7 with ammonia water, and continuing to stir for 4 hours; standing, suction filtering, washing, and drying to obtain a fluffy precursor; the precursor After mixing evenly with the weighed flux, place it in a muffle furnace protected by a reducing atmosphere for calcination, th...

Embodiment 2

[0026] According to the chemical formula (Ca 0.96 Eu 0.04 )MgSi 2 o 6 Weigh CaCO 3 (A.R.) 0.96mol, MgCO 3 (A.R.) 1mol, H 2 SiO 3 (A.R.)2mol, Eu 2 o 3 (A.R.) 0.02mol and Precipitant C 2 h 2 o 4 (A.R.) 4mol; Then take respectively the surfactant polyethylene glycol and the fluxing agent NH of 0.4wt% of the total mass of the above medicines 4 HF 2 ; First weigh the Eu 2 o 3 Dissolve with an appropriate amount of nitric acid, add an appropriate amount of deionized water and heat to 45°C; add CaCO to the above solution 3 , MgCO 3 、H 2 SiO 3, polyethylene glycol, stirring simultaneously, and adding precipitating agent several times, adjusting the solution pH=8 with ammonia water, and continuing to stir for 3 hours; standing, suction filtering, washing, and drying to obtain a fluffy precursor; the precursor After mixing evenly with the weighed flux, place it in a muffle furnace protected by a reducing atmosphere for calcination, the calcination temperature is 1050° ...

Embodiment 3

[0028] According to the chemical formula (Ca 0.94 Eu 0.06 )MgSi 2 o 6 Weigh CaCl 2 ·6H 2 O(A.R.)0.94mol, MgCl 2 ·6H 2 O(A.R.)1mol, H 2 SiO 3 (A.R.)2mol, Eu 2 o 3 (A.R.) 0.03mol and precipitant NH 4 HCO 3 (A.R.) 4mol; Take by weighing respectively the surfactant polyethylene glycol and the fluxing agent Li of above drug total mass 0.6wt% 2 CO 3 ; First weigh the Eu 2 o 3 Dissolve with an appropriate amount of hydrochloric acid, add an appropriate amount of deionized water and heat to 65°C; add CaCl to the above solution 2 ·6H 2 O, MgCl 2 ·6H 2 O, H 2 SiO 3 , polyethylene glycol, stirring simultaneously, and adding the precipitating agent in several times, adjusting the solution PH=9 with ammonia water, and continuing to stir for 2 hours; standing, suction filtering, washing, and drying to obtain a fluffy precursor; the precursor After mixing evenly with the weighed flux, place it in a muffle furnace protected by a reducing atmosphere for calcination, the ca...

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Abstract

The invention relates to blue fluorescent powder for a near ultraviolet LED and belongs to technology for preparing rare-earth fluorescent powder; the blue fluorescent powder has a chemical formula of Ca1-xMgSi2O6:xEu<2+>, x is more than 0 and less than 0.2; the technology comprises the following specific steps: according to the stoichiometric ratio of the chemical formula, calcium salt, magnesium salt, silicic acid, europia and proper amount of precipitator, surfactant and fluxing agent are weighed; the europia is dissolved through concentrated acid, is added with proper amount of deionized water, is subjected to water bath treatment, is added with the calcium salt, the magnesium salt and the surfactant, is stirred and is added with the precipitator for several times; the PH value of the solution is regulated to be more than or equal to 7 through ammonia; the solution is continuously stirred for 0.5 to 4 hours, is kept stand or is subjected to centrifugal precipitation, suction filtering, washing and drying to obtain a precursor; and the precursor and the weighed fluxing agent are evenly mixed, are positioned in a muffle furnace with the protection of reducing atmosphere and are calcined to obtain the needed fluorescent powder. The fluorescent powder completes adulteration and once calcination synthesis when the precursor is subjected to thermal decomposition, has good luminous intensity, stability, color rendering and granularity and is applicable to being used as the blue fluorescent powder of LED activated by InGaN tube core of near infrared radiation (350-410nm).

Description

1. Technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a blue fluorescent powder for near-ultraviolet LEDs and a preparation method thereof. 2. Background technology [0002] White LED lighting has the advantages of energy saving, environmental protection, safety, long life, low consumption, low heat, colored light, high brightness, waterproof, shockproof, miniature, easy dimming, concentrated beam, and easy maintenance. And the fourth revolution of human lighting after the high-pressure mercury lamp, known as the 21st century green light source. At present, the InGaN tube core irradiated by near ultraviolet (350-410nm) is widely used to excite trichromatic phosphors to realize white light LED, which can obtain better luminous efficiency and color purity. LED phosphors mostly use silicate as the luminescent material matrix, because the interaction energy between the luminescence center and the...

Claims

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Application Information

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IPC IPC(8): C09K11/79C01B33/24
Inventor 朱达川马明星涂铭旌
Owner SICHUAN UNIV
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