Silicate green emitting phosphor powder for near ultraviolet excited light emitting diode (LED)

A green phosphor and silicate technology, applied in the field of silicate green phosphors for LEDs, can solve the problems of narrow particle size distribution of phosphors, unfavorable environmental protection, low synthesis temperature, etc., and achieve good luminous characteristics and stability , high production efficiency, good crystallinity

Inactive Publication Date: 2012-10-03
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combustion method patents such as CN101280189A and CN1730606A prepare phosphors with narrow particle size distribution, low synthesis temperature, energy saving and time saving, but low purity and poor luminescent performance. A large amount of gas is released during the preparation process, which is not conducive to environmental protection.

Method used

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  • Silicate green emitting phosphor powder for near ultraviolet excited light emitting diode (LED)
  • Silicate green emitting phosphor powder for near ultraviolet excited light emitting diode (LED)
  • Silicate green emitting phosphor powder for near ultraviolet excited light emitting diode (LED)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the general chemical formula Ba 0.98 SiO 3 :0.02Eu 2+ Weigh Ba(NO 3 ) 2 (A.R.) 0.98mol, H 2 SiO 3 (A.R.) 1mol and Eu(NO 3 ) 3 ·6H 2 O(A.R.) 0.02mol; then weigh the surfactant sodium dodecylbenzenesulfonate and the flux H respectively 0.1wt% of the total mass of the above medicines 3 BO 3 ; Ba(NO 3 ) 2 (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 reactants and ligands is 1:3) Mix thoroughly, then perform ball milling, add lubricant acetone during ball milling, and the amount of acetone added is limited to being dispersed by the ball milling system until the reactants and ligands are completely reacted; Filter, wash, and dry to obtain the precursor powder; after mixing the precursor powder and the flux evenly, calcining in a reducing atmosphere provided by the burning of activated carbon powder, the calcining temperature is 1000 ° C, and the calcining time is 2 hours, that is, the target...

Embodiment 2

[0025] According to the general chemical formula Ba 0.97 SiO 3 :0.03Eu 2+ Weigh Ba(NO 3 ) 2 (A.R.) 0.97mol, H 2 SiO 3 (A.R.) 1mol and Eu(NO 3 ) 3 ·6H 2 O(A.R.) 0.03mol; and then weigh 0.3wt% of the surfactant sodium dodecylbenzenesulfonate and flux H, respectively, based on the total mass of the above medicines 3 BO 3 ; Ba(NO 3 ) 2 (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 reactants and ligands is 1:4) Mix thoroughly, then perform ball milling, add lubricant acetone during ball milling, and the amount of acetone added is limited to being dispersed by the ball milling system until the reactants and ligands are completely reacted; Filtration, washing and drying to obtain the precursor powder; after mixing the precursor powder and the flux evenly, calcining in a reducing atmosphere provided by the burning of activated carbon powder, the calcination temperature is 1100 ° C, and the calcination time is 2 ho...

Embodiment 3

[0027] According to the general chemical formula Ba 0.96 SiO 3 :0.04Eu 2+ Weigh Ba(NO 3 ) 2 (A.R.) 0.96mol, H 2 SiO 3 (A.R.) 1mol and Eu(NO 3 ) 3 ·6H 2 O(A.R.) 0.04mol; then weigh 0.5wt% of the surfactant sodium dodecylbenzenesulfonate and flux H, respectively, based on the total mass of the above medicines 3 BO 3 ; Ba(NO 3 ) 2 (A.R.), H 2 SiO 3 (A.R.), Eu(NO 3 ) 3 ·6H2 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. The amount of acetone added is limited to the dispersion of 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 nitrogen / hydrogen mixed gas, the calcining temperature is 1300°C, and the calcining time is 3 hou...

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Abstract

The invention relates to a synthesis method of silicate green emitting phosphor powder for a near ultraviolet excited light emitting diode (LED), which belongs to the preparation technology of rear earth phosphor powder. The chemical formula of the silicate is Ba1-xSiO3:xEu<2+>, wherein x is more than 0 and less than 0.1. The synthesis method of the silicate green emitting phosphor powder comprises following steps of measuring barium salt, silicic acid, europium nitrate and surface active agent and cosolvent with defined amount as required according to the chemical formula; adequately mixing the barium salt, the silicic acid, the europium nitrate, the surface active agent and ligand with defined amount, and then ball-milling, and adding a lubricant with defined amount in the ball milling process; filtering, washing and drying to obtain the precursor; and mixing the precursor with the cosolvent to be calcined under a reduction atmosphere to obtain the needed phosphor powder. The phosphor powder prepared by the method has the characteristics of wide laser excitation wavelength, high light emitting intensity, good crystallization and narrow distribution of granularity and is suitable for being used as the green emitting phosphor powder for the near ultraviolet excited white LED.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, in particular to a near-ultraviolet excited silicate green phosphor for LEDs. Background technique [0002] As a new type of solid light source, white LED lighting is known as the fourth-generation green lighting source. With significant advantages such as long life, energy saving, environmental protection, small size and fast response, it has huge application prospects in the field of lighting and display, and has set off a wave of white LEDs in the global semiconductor and lighting fields. [0003] In recent years, people generally use near-ultraviolet-ultraviolet (350-410nm) emitting InGaN chips to excite three-color phosphors to realize white LEDs, or add green and red phosphors to blue LED chips to achieve high color rendering, Low color temperature white LEDs. LED phosphors mostly use silicate as the luminescent material matrix. On the one hand, due to the rich source of sil...

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 曹仕秀彭玲玲韩涛程小耀杨小琴魏宁
Owner CHONGQING UNIV OF ARTS & SCI
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