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Secondarily-excited type silicon-aluminate long-afterglow fluorescent powder and preparation method thereof

A type of aluminosilicate, secondary excitation technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of poor chemical stability, short afterglow time, low luminous brightness, etc., and achieve low cost, easy operation, high brightness high effect

Active Publication Date: 2015-04-08
重庆地恩科技开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfur-containing red long-lasting materials have better afterglow and brightness, but their chemical stability is poor, and their applications are limited
Alkaline earth titanate system red long afterglow luminescent material with low luminous brightness and short afterglow time
The cost of red long afterglow materials in phosphate system is low, but most of the preparation needs reducing atmosphere protection, and the process is complicated

Method used

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  • Secondarily-excited type silicon-aluminate long-afterglow fluorescent powder and preparation method thereof
  • Secondarily-excited type silicon-aluminate long-afterglow fluorescent powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] According to the structural formula Sr 3.94 Al 1.994 SiO 9 :0.06Eu 2+ ,0.006Dy 3+ Weigh out SrCO 3 (A.R.)3.94mol, Al 2 o 3 (A.R.)0.997mol, SiO 2 (A.R.) 1mol, Eu 2 o 3 (A.R.)0.03mol and Dy 2 o 3 (A.R.) 0.003mol, then weigh the flux H of 5wt% of the total mass of the above drugs 3 BO 3 Mix the above weighed raw materials evenly, and then calcinate under the reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature is 1400°C, and the calcining time is 8h, to obtain the target product.

Embodiment 2

[0020] According to the structural formula Sr 2.94 CaAl 1.994 SiO 9 :0.06Eu 2+ ,0.006Nb 3+ Weigh out SrCO 3 (A.R.) 2.94mol, CaCO 3 1mol, Al 2 o 3 (A.R.)0.997mol, SiO 2 (A.R.) 1mol, Eu 2 o 3 (A.R.) 0.03mol and Nb 2 o 3 (A.R.) 0.003mol, and then respectively weigh the flux BaF of the total mass of the above drugs 3wt% 2 ; Mix the above-mentioned raw materials weighed uniformly, then in H 2 -N 2 (Volume ratio 5:95) calcined under reducing atmosphere, the calcined temperature is 1420°C, and the calcined time is 8h to obtain the target product.

Embodiment 3

[0022] According to the structural formula Sr 2.94 CaAl 1.994 SiO 9 :0.06Eu 2+ ,0.005Dy 3+ Weigh out SrCO 3 (A.R.) 2.94mol, CaCO 3 1mol, Al2 o 3 (A.R.)0.997mol, SiO 2 (A.R.) 1mol, Eu 2 o 3 (A.R.)0.03mol and Dy 2 o 3 (A.R.) 0.003mol, and then weigh the flux CaF of 0.5wt% of the total mass of the above drugs 2 ; Mix the above-mentioned raw materials weighed uniformly, then in H 2 -N 2 (Volume ratio 10:90) calcined under reducing atmosphere, the calcined temperature is 1420°C, and the calcined time is 8h to obtain the target product.

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Abstract

The invention relates to secondarily-excited type silicon-aluminate long-afterglow fluorescent powder and a preparation method thereof, which belongs to the technical field of luminescent materials. The composition of the fluorescent powder is Sr3+x-aM1-xAl2x-b-cSiO5+4x: aEu<2+>, bDy<3+>, cRE<3+> (M=Ca, Sr, Ba, Zn; RE=Nb, Sm, Tm, Er, Ce, Pr and the like, 0(x(5; 0(a(0.8; 0(b(0.5; 0(c(0.5). The designing idea of the fluorescent powder is that two luminescent centers, i. e. the Eu<2+> and the RE<3+>, exist, the emission spectrum of Eu<2+> is superposed with the excitation spectrum of the RE<3+>, and energy transfer exists between the Eu<2+> and the RE<3+>; the Eu<2+> is excited to emit light by external incident light, and the RE<3+> is then excited to emit the light by the emitted light of the Eu<2+> to form secondarily-excited type emitted light; the color of the emitted light is determined by the concentration ratio of the Eu<2+> to the RE<3+>; and the afterglow time of progressively-excited type fluorescent powder is determined by the proportion of the Eu<2+> and the Dy<3+>. The related preparation method comprises the following steps of: weighing all kinds of oxide raw materials according to the measuring ratio of all elements, adding a fluxing agent, placing and calcining under a reducing atmosphere after uniformly mixing through ball milling, and crushing and sieving a product to obtain the required fluorescent powder. The secondarily-excited type fluorescent powder can emit green, red and even white fluorescent light, and the afterglow time can reach 8-12 hours.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a secondary excitation type long afterglow luminescent material, and also relates to a preparation method of the luminescent material. Background technique [0002] Long afterglow luminescent material, commonly known as luminous material, is a kind of photoluminescent material. Under the irradiation of sunlight, fluorescent lamp, incandescent lamp, etc., it can absorb the energy in the light, store the absorbed energy in the material, and then emit light The stored energy is slowly released in the form of Long afterglow luminescent materials have been widely used in emergency indication equipment, low-light lighting, arts and crafts, information storage and high-energy ray detection and other fields. At present, blue-green and yellow-green long-lasting materials are mainly aluminates and silicates doped with rare earth elements. These two types of materials are bette...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
Inventor 彭玲玲曹仕秀韩涛程小耀杨小琴魏宁
Owner 重庆地恩科技开发有限责任公司
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