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Method for directly preparing large-particle LuAG fluorescent powder from LuAG fine powder

A large particle, phosphor technology, applied in chemical instruments and methods, luminescent materials, recycling technology, etc., can solve the problems of uneven sedimentation, poor particle size distribution of phosphor powder, uneven light color, etc., and achieve high product quality. , the particle size is controllable, and the effect of improving the recovery rate

Active Publication Date: 2020-06-05
英特美光电(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after size mixing, the particle size distribution of the phosphor powder is poor, and in the actual packaging process, unevenness of settlement occurs, resulting in unevenness of light color

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 This example provides a method for directly preparing large particle LuAG phosphors with LuAG fine powder, including the following steps:

[0025] (1) LuAG raw material (68.289g lutetium oxide Lu 2 o 3 , 0.396g cerium oxide CeO 2 , 29.354g alumina Al 2 o 3 , 1.961 barium fluoride BaF 2 ) mixed evenly, x=0.02, at this time n(Lu 2 o 3 :CeO 2 :Al 2 o 3 :BaF 2 )=1.49:0.02:2.5:0.1, under the mixed gas of hydrogen and nitrogen with a volume ratio of 3:1, sintered at 1350°C for 3 hours, then cooled and taken out, then crushed once, rolled once, and sieved (sieve 100 mesh), the powder under the sieve is the intermediate;

[0026] (2) The mass ratio of LuAG fine powder to the intermediate is 50:100, and 50g of LuAG fine powder (fine powder produced during the preparation of conventional large-grained LuAG phosphor, with an average particle size of 3-13 μm) is added to the intermediate , mixed in a conical mixing barrel for 1 hour until uniform, placed in a ...

Embodiment 2

[0027] Embodiment 2 This embodiment provides a method for directly preparing large particle LuAG phosphors with LuAG fine powder, which is basically consistent with that in Example 1, except that x=0.08, n(Lu 2 o 3 :CeO 2 :Al 2 o 3 :BaF 2 )=1.46:0.08:2.5:0.1, LuAG raw material (including 66.914g lutetium oxide Lu 2 o 3 , 1.584g cerium oxide CeO 2 , 29.354g alumina Al 2 o 3 , 1.961 barium fluoride BaF 2 ), the obtained large particle LuAG phosphor, D 50 =19.4 μm, PSD=0.55, the yield of the product is 80.2%.

Embodiment 3

[0028] Embodiment 3 This embodiment provides a method for directly preparing large particle LuAG phosphors with LuAG fine powder, which is basically the same as that in Example 1, except that x=0.15, n(Lu 2 o 3 :CeO 2 :Al 2 o 3 :BaF 2 )=1.425:0.15:2.5:0.1, LuAG raw material (including 63.419g lutetium oxide Lu 2 o 3 , 2.887g cerium oxide CeO 2 , 29.354g alumina Al 2 o 3 , 1.961 barium fluoride BaF 2 ), the obtained large particle LuAG phosphor, D 50 =21.3 μm, PSD=0.9, the yield of the product is 79.8%.

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Abstract

The invention relates to a method for directly preparing large-particle LuAG fluorescent powder from LuAG fine powder. The method comprises the following steps: (1) uniformly mixing LuAG raw materials, sintering at a high temperature in a reducing atmosphere, cooling, taking out, crushing, rolling, and sieving to obtain sieved powder, namely an intermediate; and (2) adding LuAG fine powder into the intermediate, uniformly mixing according to a feeding mass ratio of LuAG fine powder to the intermediate of (5-100): 100, sintering at a high temperature, cooling, taking out, rolling, and sieving to obtain sieved powder, namely the large-particle LuAG fluorescent powder. The LuAG fine powder can be directly recycled, dissolution and recycling are not needed, the recycling cost is reduced, and pollution to the environment is reduced. Compared with conventionally produced large-particle LuAG fluorescent powder, the prepared large-particle LuAG fluorescent powder has the advantages that the particle size is uniform and controllable, and the luminous intensity is not lower than that of the conventionally produced large-particle LuAG fluorescent powder. The method is simple in process, highin product quality and suitable for industrial production. The recovery rate of LuAG fine powder is improved, and the large-particle LuAG fluorescent powder can be widely applied to manufacturing of luminescent materials.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a method for directly preparing large particle LuAG fluorescent powder by using LuAG fine powder. Background technique [0002] At present, with the increasing demand for large particle phosphors, the specification for LuAG in the market is D 50 =13~24 microns, PSD=(D 90 -D 10 ) / D 50 <0.9; but in the process of large-scale production of phosphors, products with suitable specifications cannot be obtained. In the process of post-processing and cleaning, it is necessary to undergo rinsing and classification, that is, to classify LuAG with small particle size (LuAG fine powder, particle size D 50 = 3-13 microns), so as to obtain LuAG phosphors that meet customer specifications. Especially for LuAG (Lu 3 al 5 o 12 : Ce 3+ ), the cost of raw materials is very high (the price of lutetium oxide is high), in order to reduce costs, the recycling of LuA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/01C09K11/80
CPCC09K11/7774C09K11/01Y02W30/50
Inventor 刘军周卫新贾占坤顾竟涛
Owner 英特美光电(苏州)有限公司
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