A kind of preparation method of high-efficiency spherical-like green phosphor for white LED

A technology of green fluorescent powder and spherical type, which is applied in the field of preparation of fluorescent materials for white light LEDs, can solve the problems of uneven distribution of green fluorescent powder particles and low luminous efficiency for white light LEDs, and achieve improved luminous quantum efficiency and crystallization High degree, the effect of reducing the existence of impurity phases

Active Publication Date: 2016-09-14
BEIJING ZHONGCUN YUJI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a preparation method of green phosphor powder for white light LED, to solve the problems of uneven particle distribution and low luminous efficiency of green phosphor powder for white light LED prepared by the existing method

Method used

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  • A kind of preparation method of high-efficiency spherical-like green phosphor for white LED
  • A kind of preparation method of high-efficiency spherical-like green phosphor for white LED
  • A kind of preparation method of high-efficiency spherical-like green phosphor for white LED

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Experimental program
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Embodiment 1

[0039] Weigh 119.38g Lu 2 o 3 , 50.98g Al 2 o 3 , 1.72g CeO 2 Add 1.72g of polyethylene oxide into 1L of deionized water, then put it into a ball mill tank, grind at 60rpm for 2h, and spray dry the obtained powder slurry. The outlet temperature of the spray dryer is 85°C. One-time sintering, the sintering atmosphere is air atmosphere, the sintering temperature is 1100°C, and the sintering time is 2h. The obtained powder is passed through a 100-mesh nylon sieve, and then mixed with 15.49g SrF 2 and 0.86g H 3 BO 3 , use a V-type mixer to mix for 3 hours, and then sinter in a reducing atmosphere. The sintering temperature is 1550 ° C, the sintering time is 2 hours, and the sintering atmosphere is H 2 :N 2 =3:2 (volume ratio), the sintered powder undergoes a post-processing process to form a product. The resulting product looks like figure 2 shown.

Embodiment 2

[0041] According to the process conditions described in Table 1, implement according to the method of Example 1, all examples can realize the object of the invention of the present invention.

[0042] Table 1

[0043]

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Abstract

The invention discloses a preparation method of high-efficiency spherical green fluorescent powder for white light LEDs (light-emitting diodes). The preparation method comprises the following steps: (1) preparing raw materials according to the stoichiometric proportion, weighing an adhesive which accounts for 0.5-5 wt% of the raw materials, and carrying out wet mixing on the raw materials in deionized water by using a ball mill to obtain a uniform powder slurry, and carrying out spray granulation on the powder slurry to obtain a highly dispersed spherical powder precursor; (2) carrying out first sintering on the powder precursor in an oxidizing atmosphere to form first sintering powder; and (3) mixing the first sintering powder with a fluxing agent, and carrying out second sintering in a reducing atmosphere to obtain the green fluorescent powder for white light LEDs. The green fluorescent powder for LEDs has the advantages of high crystallization degree, higher quantum efficiency and higher granule uniformity due to the spherical granular shale of the powder.

Description

technical field [0001] The invention belongs to the field of luminescent materials related to solid lighting, and relates to a preparation method of fluorescent materials for white light LEDs. Background technique [0002] White light LEDs will surely enter the general lighting market with the improvement of efficiency and the reduction of cost. If you want to achieve a color temperature of 3000K and display index Ra greater than 80, the packaging of white light LEDs must use green phosphors and red phosphors to blend the spectrum. The light component will account for more than 60%, so the efficiency of the green phosphor will seriously affect the overall efficiency of the white LED. [0003] At present, LED green phosphors are mainly silicate system and aluminate system. Due to the existence of hydrolysis process, the silicate system will cause serious light decay and color coordinate drift. Therefore, aluminate will be the mainstream system of LED green phosphors. . [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
CPCY02B20/00
Inventor 杨志平赵金鑫
Owner BEIJING ZHONGCUN YUJI TECH
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