Silicate green fluorescent powder for white light emitting diode (LED) and preparation method for fluorescent powder

A green phosphor and silicate technology, which is applied in the field of silicate green phosphor for white light LED and its preparation, can solve the problems of the decline of the luminescence performance and the use performance of the phosphor, and achieve shortened chemical reaction time, uniform distribution, and ease of use. effect of operation

Inactive Publication Date: 2012-07-04
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequent pulverization process will cause a significant drop in phosphor luminescence performance and usability

Method used

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  • Silicate green fluorescent powder for white light emitting diode (LED) and preparation method for fluorescent powder
  • Silicate green fluorescent powder for white light emitting diode (LED) and preparation method for fluorescent powder
  • Silicate green fluorescent powder for white light emitting diode (LED) and preparation method for fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the general chemical formula Ca 1.98 MgSi 2 o 7 :0.02Eu 2+ Weigh Ca(NO 3 ) 2 4H 2 O(A.R.)1.98mol, MgCl 2 ·6H 2 O(A.R.)1mol, H 2 SiO 3 (A.R.)2mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.02mol; Take by weighing respectively 0.1wt% surfactant sodium dodecylbenzene sulfonate and flux H of the total mass of the above medicines 3 BO 3 ; The Ca(NO 3 ) 2 4H 2 O(A.R.), MgCl 2 ·6H 2 O(A.R.), H 2 SiO 3 (A.R.), Eu(NO 3 ) 3 ·6H 2 O(A.R.), surfactant and ligand NH 4 HCO 3 (The ratio of reactant and ligand is 1: 3) fully mix, then carry out ball milling, add lubricant acetone during ball milling, the addition amount of acetone is limited to being kept dispersed by ball milling system, till reactant and ligand react completely; Filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining in a reducing atmosphere provided by activated carbon powder combustion, the calcining temperature is 1...

Embodiment 2

[0025] According to the general chemical formula Ca 1.97 MgSi 2 o 7 :0.03Eu 2+ Weigh out CaCl 2 ·6H 2 O(A.R.)1.97mol, Mg(NO 3 ) 2 ·6H 2 O(A.R.)1mol, H 2 SiO 3 (A.R.)2mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.03mol; Take by weighing respectively 0.3wt% surfactant sodium dodecylbenzene sulfonate and flux H of the total mass of the above medicines 3 BO 3 ; CaCl to be weighed 2 ·6H 2 O(A.R.), Mg(NO 3 ) 2 ·6H 2 O(A.R.), H 2 SiO 3 (A.R.), Eu(NO 3 ) 3 ·6H 2 O(A.R.), surfactant and ligand NH 4 HCO 3(The ratio of reactant and ligand is 1: 4) fully mix, then carry out ball milling, add lubricant acetone during ball milling, the addition amount of acetone is limited to be kept dispersed by ball milling system, till reactant and ligand completely react; Filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining in a reducing atmosphere provided by activated carbon powder combustion, the calcining temp...

Embodiment 3

[0027] According to the general chemical formula Ca 1.96 MgSi 2 o 7 :0.04Eu 2+ Weigh Ca(NO 3 ) 2 4H 2 O(A.R.)1.96mol, Mg(NO 3 ) 2 ·6H 2 O(A.R.)1mol, H 2 SiO 3 (A.R.)2mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.04mol; Take by weighing respectively the surfactant sodium dodecylbenzene sulfonate and flux H of 0.5wt% of the total mass of the above medicines 3 BO 3 ; The Ca(NO 3 ) 2 4H 2 O(A.R.), Mg(NO 3 ) 2 ·6H 2 O(A.R.), H 2 SiO 3 (A.R.), Eu(NO 3 ) 3 ·6H 2 O(A.R.), surfactant and ligand NH 3 ·H 2 O (the ratio of the reactant and the ligand is 1:5) is fully mixed, and then ball milled, the lubricant acetone is added during the ball milling, and the amount of acetone added is limited to be kept dispersed by the ball milling system until the reactant and the ligand are completely reacted; Suction filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining in a reducing atmosphere provided by a ni...

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Abstract

The invention relates to a method for synthesizing silicate green fluorescent powder for a white light emitting diode (LED), and belongs to a technology for preparing rare-earth fluorescent powder. The chemical formula of the fluorescent powder is Ca2-xMgSi2O7:xEu<2+>, wherein x is more than 0 and less than 0.1. The method comprises the following steps of: weighing the required alkali earth metal compound, silicic acid, europium nitrate, an appropriate amount of surfactant and a flux in a stoichiometric ratio; fully mixing the alkali earth metal compound, the silicic acid, the europium nitrate, the surfactant and an appropriate amount of ligand, performing ball milling, and adding an appropriate amount of lubricant during ball milling; performing suction filtering, washing, and drying to obtain a precursor; and mixing the precursor and the flux, and calcining in reducing atmosphere to obtain the required fluorescent powder. The fluorescent powder prepared by the method is large in excitation wavelength, high in luminous intensity and crystallinity, narrow in particle size distribution and suitable to be used as the green fluorescent powder for the white LED.

Description

1. Technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a silicate green fluorescent powder for white light LEDs and a preparation method thereof 2. Background technology [0002] White light LED has the advantages of energy saving, environmental protection (no pollution, recyclable), small size (small particles, easy to combine), low calorific value (no heat radiation), low power consumption, long life (more than 10,000 hours), fast response, etc. , widely used in mobile phones, liquid crystal display backlight, indicator light, outdoor lighting, indoor lighting, landscape lighting, billboards, traffic lights, etc., known as the fourth generation of 21st century green lighting source, in the global semiconductor and lighting There has been a wave of white LED upsurge in the field. At present, the white light LED mainly utilizes the emitted light of a light emitting diode (LED) to excite phosphor powder t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
CPCY02B20/181Y02B20/00
Inventor 曹仕秀韩涛赵聪马明星涂铭旌
Owner CHONGQING UNIV OF ARTS & SCI
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