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Rare earth luminescent material preparation method containing crystal defect repair technology and product thereof

A technology of rare earth luminescence and crystal defects, applied in the field of powder metallurgy, to improve the internal quantum efficiency and thermal stability of luminescence, avoid the decline of luminescence performance, and ensure the thermal stability of luminescence

Active Publication Date: 2015-08-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to improve the existing garnet-structured Ce 3+ Activation of rare earth aluminate fluorescent materials RE 3 (Al,Ga) 5 o 12 : Insufficiency of Ce (RE=Y, Gd, Lu, Tb, Sc) synthesis, the present invention provides a preparation method of rare earth luminescent material containing crystal defect repair process and its products

Method used

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  • Rare earth luminescent material preparation method containing crystal defect repair technology and product thereof
  • Rare earth luminescent material preparation method containing crystal defect repair technology and product thereof
  • Rare earth luminescent material preparation method containing crystal defect repair technology and product thereof

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Embodiment 1

[0074] Step 1: After uniformly mixing the flux, the fluorescent material base material used for primary sintering, and the activator containing cerium (Ce), in 10% H 2 and 90%N 2 Calcined at 1500°C for 8 hours under reducing atmosphere. After being released from the furnace, the product is crushed, ball milled, washed with water, filtered and dried to obtain clinker.

[0075] The fluorescent material base material used for primary sintering is Y 2 o 3 and Al 2 o 3 powder mixture. Y in this example 2 o 3 、Al 2 o 3 and CeO 2 The molar ratio of 2.94:3:0.06, the chemical formula of the obtained clinker is Y 2.94 Ce 0.06 Al 5 o 12 . Described flux is boric acid (H 3 BO 3 ) and barium fluoride (BaF 2 ) mixed powder, wherein, respectively weigh H 3 BO 3 and BaF 2 .

[0076] Step 2: adding raw meal to the clinker obtained in step 1, and uniformly mixing by dry method to obtain clinker mixed with raw meal. In this embodiment, the raw material is the phosphor-base...

Embodiment 2

[0083] Step 1: After uniformly mixing the flux, the fluorescent material base material used for primary sintering, and the activator containing cerium (Ce), in 25% H 2 and 75%N 2 After calcining at 1500° C. for 8 hours under reducing atmosphere, clinker was obtained. The fluorescent material base material used for primary sintering is Y 2 o 3 and Al 2 o 3 powder mixture. Y in this example 2 o 3 、Al 2 o 3 and CeO 2 The molar ratio of 2.94:3:0.06, the chemical formula of the obtained clinker is Y 2.94 Ce 0.06 Al 5 o 12 . That is, RE is Y in this embodiment 3+ . Described flux is boric acid (H 3 BO 3 ) and barium fluoride (BaF 2 ) of mixed powder, H 3 BO 3 and BaF 2 All are weighed according to 2% of the mass of the fluorescent material base material used for primary sintering.

[0084] Step 2: Add raw meal to the clinker obtained in step 1 to obtain clinker mixed with raw meal.

[0085] In this embodiment, the raw material is a fluorescent matrix material...

Embodiment 3

[0090] Step 1: After uniformly mixing the flux, the fluorescent material base material used for primary sintering, and the activator containing cerium (Ce), in 25% H 2 and 75%N 2 Calcined at 1500°C for 8 hours under reducing atmosphere. After being released from the furnace, the product is crushed, ball milled, washed with water, filtered and dried to obtain clinker. The fluorescent material base material used for primary sintering is Y 2 o 3 and Al 2 o 3 powder mixture. Y in this example 2 o 3 、Al 2 o 3 and CeO 2 The molar ratio is 2.94:3:0.06. Described flux is boric acid (H 3 BO 3 ) and barium fluoride (BaF 2 ) mixed powder, wherein, respectively weigh H 3 BO 3 and BaF 2 .

[0091] Step 2: adding raw meal to the clinker obtained in step 1, and uniformly mixing by dry method to obtain clinker mixed with raw meal. In this embodiment, the raw material is Y 2 o 3 , Tb 4 o 7 and Al 2 o 3 A mixture whose composition satisfies the chemical formula (Y 1-x ...

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Abstract

The invention provides a rare earth luminescent material preparation method containing crystal defect repair technology and a product thereof to overcome disadvantages in synthesis of garnet activated rare earth aluminate fluorescent materials in the prior art. The preparation method comprises the following four steps: preparation of clinker; preparation of clinker blended with a raw material; preparation of a fluorescent powder material having undergone secondary annealing; and preparation of the finished fluorescent material. The finished fluorescent material prepared by using the method has external quantum efficiency of 0.706 to 0.745 and internal quantum efficiency of 0.953 to 0.992 in a temperature range of room temperature to 150 DEG C. The invention has the following beneficial technical effects: the raw material is used to replace an activator during secondary reduction; and in virtue of cooperative action of surface modification and secondary reduction thermodynamics, crystal defects are eliminated, and internal quantum efficiency and photo-thermal stability of the Ce<3+> activated garnet structure rare earth aluminate luminescent material are improved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to the preparation technology of rare earth aluminate with garnet structure, in particular to the preparation method of rare earth luminescent material with crystal defect repairing process and its product. Background technique [0002] Ce 3+ Activated garnet-structured rare earth aluminate fluorescent materials, including Y 3 Al 5 o 12 (YAG), Tb 3 Al 5 o 12 、Gd 3 Al 5 o 12 、Sc 3 Al 5 o 12 and Lu 3 Al 5 o 12 (collectively: RE 3 Al 5 o 12 : Ce), which has very important applications in real life. The earliest use of garnet dates back to the Stone Age, as a gemstone and abrasive due to its hardness and brilliant color. YAG synthetic single crystal is an important simulant of artificial gemstones. In 1964, Bell Labs Geusic used YAG as a solid-state laser substrate, such as YAG: Nd and YAG: Er, which have been widely used in medical surgery, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 陈雷刘法湧陈秀玲赵二龙张昭蒋阳
Owner HEFEI UNIV OF TECH
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