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Ball-shaped red-enhanced phosphor used in white light LED, and preparation method thereof

A phosphor and spherical technology is applied in the field of spherical, reddening phosphors for white light LEDs and their preparation, which can solve the problems of reduced luminous performance and service life, changes in surface properties of phosphors, irregular morphology, etc., and achieves crystallinity. And the effect of good coating performance, good reproducibility and short holding time

Inactive Publication Date: 2011-10-19
CHONGQING UNIV OF ARTS & SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature solid-phase method has a high calcination temperature and a long holding time, resulting in coarse particles and irregular shapes.
The subsequent ball milling dispersion process will change the surface properties of the phosphor, resulting in a reduction in luminous performance and service life

Method used

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  • Ball-shaped red-enhanced phosphor used in white light LED, and preparation method thereof
  • Ball-shaped red-enhanced phosphor used in white light LED, and preparation method thereof
  • Ball-shaped red-enhanced phosphor used in white light LED, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the structure Y 2.65 Gd 0.2 Sr 0.05 Ce 0.1 Al 5 o 12 Weigh Y(NO 3 ) 3 ·6H 2 O(A.R.)2.65mol, Gd(NO 3 ) 3 ·6H 2 O(A.R.)0.2mol, Sr(NO 3 ) 2 0.05mol, Ce(NO 3 ) 3 ·6H 2 O(A.R.)0.1mol, Al(NO 3 ) 3 9H 2 O (A.R.) 5mol, then weigh respectively the surfactant polyethylene glycol-6000 of 0.1wt% of the total mass of the above medicines; 4 HCO 3 (The ratio of the reactant and the ligand is 1: 4) fully mixed, then ball milled, adding lubricant acetone during ball milling, the amount of acetone added is limited to be kept dispersed by the ball milling system until the reactant reacts completely with the ligand; Filtrate, wash, add dilute nitric acid solution, configure precursor suspension, make the solid content reach 3wt%; set spray dryer parameter sample flow rate 1L / h, inlet temperature 220 ℃, air flow rate 30L / min, mix precursor The suspension was spray-dried to obtain the precursor powder; the precursor powder was pre-sintered at 900°C for 2 hour...

Embodiment 2

[0028] According to the structure Y 2.7 La 0.1 Sr 0.1 Ce 0.1 Al 4.95 Cu 0.05 o 12 Weigh Y(NO 3 ) 3 ·6H 2 O(A.R.)2.7mol, La(NO 3 ) 3 ·6H 2 O(A.R.)0.1mol, Sr(NO 3 ) 2 0.1mol, Ce(NO 3 ) 3 ·6H 2 O(A.R.)0.1mol, Al(NO 3 ) 3 9H 2 O(A.R.)4.95mol and CuSO 4 ·5H 2 O 0.05mol, then respectively take by weighing the surfactant polyvinyl alcohol of above drug gross mass 0.2wt%; With the raw material salt that weighs, surfactant and appropriate part (NH 4 ) 2 CO 3 (The ratio of the reactant and the ligand is 1: 3) fully mixed, and then ball milled, adding lubricant ethanol during ball milling, the amount of ethanol added is limited to be kept dispersed by the ball milling system until the reactant reacts completely with the ligand; Filtrate, wash, add dilute hydrochloric acid solution, configure the precursor suspension, so that the solid content reaches 1wt%; set the spray dryer parameter injection flow rate 1.5L / h, inlet temperature 200 ° C, air flow rate 50L / min, th...

Embodiment 3

[0030] According to the structure Y 2.7 SM 0.1 Ba 0.1 Ce 0.1 Al 4.95 Zn 0.05 o 12 Weigh Y(NO 3 ) 3 ·6H 2 O(A.R.)2.7mol, Sm(NO 3 ) 3 ·6H 2 O(A.R.)0.1mol, Ba(NO 3 ) 2 0.1mol, Ce(NO 3 ) 3 ·6H 2 O(A.R.)0.1mol, Al(NO 3 ) 3 9H 2 O(A.R.)4.95mol and ZnSO 4 ·7H 2 O 0.05mol, then respectively take by weighing the surfactant polyvinyl alcohol of above drug total mass 1wt%; Raw material salt, tensio-active agent and appropriate part (NH 4 ) 2 CO 3 (The ratio of the reactant and the ligand is 1: 6) fully mixed, then ball milled, adding lubricant acetone during ball milling, the amount of acetone added is limited to be kept dispersed by the ball milling system until the reactant and the ligand react completely; Filtrate, wash, add dilute hydrochloric acid solution, prepare the precursor suspension, make the solid content reach 1wt%; set the spray dryer parameter sample flow rate 0.8L / h, inlet temperature 200 ℃, air flow rate 60L / min, the precursor The suspension was ...

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PUM

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Abstract

The invention relates to ball-shaped red-enhanced phosphor used in white light LEDs, and a preparation method thereof. The structural formula of the phosphor is: YxREyMzCemAl5-nAnO12, wherein RE is at least one among Tb, Gd, Sm, Yb, La, and Lu; M is at least one among Mg, Ba, Ca, and Sr; A is at least one among Ga, Cu, Zn, Ni, Ge, and Si; 1.8<x<3; 0<=y<=0.8; 0<=z<=0.2; 0<m<=0.2; 2.9<x+y+z+m<3.1; 0<=n<=0.5; and 0<y+z+n<1. The preparation method is that: proper amounts of Y salt, RE salt, M salt, Ce salt, Al salt and A salt are weighed according to the stoichiometric ratio of the elements in the structural formula; the salts are well-mixed with a proper amount of surfactant; a precursor is then prepared with a mechanical solid-phase reaction method or a coprecipitation method; the mixture is processd through vacuum-filtrating and washing; a certain amount of volatile acid is added to the mixture, such that a suspension liquid is prepared; the suspension liquid is then produced into ball-shaped precursor power through spray drying; the ball-shaped precursor power is processed through pre-sintering, and then calcined under a reductive atmosphere, such that target phosphor is obtained. The phosphor provided by the present invention is ball-shaped. Red shifts occur in the emitted wavelength of the phosphor. The phosphor has good color rendering property, and can be effectively excited by blue-light chips.

Description

1. Technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a spherical and reddening fluorescent powder for white LEDs and a preparation method thereof. 2. Background technology [0002] Due to the advantages of small size, low power consumption, long life, safety and environmental protection, and easy development into lightweight products, white light-emitting diodes (LEDs) are expected to become the fourth-generation lighting source beyond incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps. It is used in fields such as lighting, traffic and display backlight, and has a very broad application prospect. Among the various methods to realize white LEDs, the phosphor conversion method is a method that has been applied and has potential, using Ga(In)N-based blue light-emitting diodes and yellow-emitting YAG:Ce 3+ The white light diodes made have been commercialized and successfully appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
CPCY02B20/00
Inventor 韩涛朱达川赵聪马明星曹仕秀涂铭旌张进
Owner CHONGQING UNIV OF ARTS & SCI
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