Red long-afterglow phosphor material and its prepn process

A long afterglow phosphor, red technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of easy decomposition into miscellaneous phases, difficult to maintain the composition and structure of the matrix phase, and achieve uniform particle size distribution and low cost of raw materials. , Preparation technology for fast effect

Inactive Publication Date: 2007-06-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Secondly, for the matrix phase Sr of the red phosphor 3 Al 2 o 6 , unstable at high temperature, easy to decompose into impurity phases, it is not easy to maintain the phase composition and structure of the matrix with traditional electric furnace burning, it needs to be improved by using a new rapid burning method
[0003] Therefore, these red phosphor materials cannot be practically applied yet, so research and development of red long afterglow materials with certain brightness and afterglow time, adjustment of chemical composition, and design of new preparation methods have always been the important contents of people's efforts to develop

Method used

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  • Red long-afterglow phosphor material and its prepn process
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preparation example Construction

[0011] The preparation steps of the red long-lasting phosphor material of the present invention include: preparation of rare earth composite sol, preparation of dry gel particles, and rapid microwave burning. According to the stoichiometric ratio, strontium (Sr), europium (Eu) and dysprosium (Dy) elements in the form of strontium nitrate, europium nitrate and dysprosium nitrate, all of which have a purity of 99.99%, are added to the nano pseudoboehmite sol together ; Add boric acid (H 3 BO 3 ), the amount is 0.1-1% of the total solid content added above. After mechanical stirring or ultrasonic dispersion, the rare earth composite sol is obtained; the composite sol is sprayed and granulated by hot air to obtain dry gel particles; the dry gel particles are burned in a microwave oven filled with a reducing atmosphere to obtain red long-lasting phosphors Material. in:

[0012] Nano pseudo-boehmite is based on the AlOOH phase, the size is 40nm-80nm, and the purity is 95%-97%. T...

example 1

[0017] According to the chemical formula Sr a Al b o 6 :cEu 2+ , dDy 3+ , get b=2, c=0.2, d=0.1, take by weighing the nano pseudo-boehmite (with AlOOH, purity 95%) powder of 100 grams of raw materials, weigh the corresponding Sr(NO 3 ) 2 (purity 99%), Eu(NO 3 ) 3 ·6H 2 O (purity 99.99%) and Dy (NO 3 ) 3 ·6H 2 O (purity 99.99%) and 1 gram of boric acid (H 3 BO 3 , purity 99%), put into the beaker together; Add deionized water according to the mass ratio of pseudo-boehmite: water=3%: 97%, mechanically stir; Be 30% dilute nitric acid solution dropwise with concentration, until pH = 2, continue stirring for 2 hours to obtain a rare earth composite sol. The rare earth composite sol is granulated by hot air spraying, the heating air temperature is 120°C, and the drying air volume is 80m 3 / h, the material flow is 2L / h, to obtain granular xerogel particles; the xerogel particles are packed in a 200ml corundum crucible and placed in a microwave oven, activated carbon par...

example 2

[0019] According to the chemical formula Sr a Al b o 6 :cEu 2+ , dDy 3+ , get b=2, c=0.1, d=0.0.05, take by weighing the nano pseudoboehmite (with AlOOH, purity 95%) powder of 100 grams of raw materials, weigh the corresponding Sr(NO 3 ) 2 (purity 99%), Eu(NO 3 ) 3 ·6H 2 O (purity 99.99%) and Dy (NO 3 ) 3 ·6H 2 O (purity 99.99%) and 0.5 grams of boric acid (H 3 BO 3 , purity 99%), put into a beaker together; Add deionized water according to the mass ratio of pseudo-boehmite: water=5%: 95%, mechanically stir; Be 30% dilute nitric acid solution dropwise with concentration, until pH = 1, continue stirring for 3 hours to obtain a thin composite sol. The rare earth composite sol is granulated by hot air spraying, the heating air temperature is 110°C, and the drying air volume is 100m 3 / h, the material flow is 3L / h, to obtain granular xerogel particles; the xerogel particles are packed in a 200ml corundum crucible and placed in a microwave oven, activated carbon parti...

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Abstract

The present invention relates to one kind of red long afterglow phosphor material and its preparation process. The matrix of the phosphor powder is aluminate in the chemical expression of SraAlbO6:cEu2+, dDy3+, where, a=3-c-d, b is 1.9-2.1, c is 0.1-0.2, and d is 0.05-0.1. It is prepared through a nanometer pseudoboehmite sol-gel and microwave ignition process including hot air spray pelletizing of composite RE sol, ignition of dry gel in reducing atmosphere inside a microwave oven and cooling to room temperature to obtain the red long afterglow phosphor material. The red long afterglow phosphor material has the advantages of pure physical phase, homogeneous granularity distribution, loose powder, low material cost, simple preparation process and easy industrial production.

Description

【Technical field】 [0001] The invention belongs to the field of luminescent materials, in particular to a red long-lasting phosphor material and a preparation method thereof. 【Background technique】 [0002] Red long afterglow materials include rare earth activated alkaline earth metal sulfides, sulfur oxides, strontium aluminum sulfides, alkaline earth titanates and zinc phosphate systems. The brightness and afterglow time of sulfur-containing red long-lasting materials are better, but they are easy to oxidize and hydrolyze, and their applications are limited. Other red long afterglow materials include Pr 3+ Activated titanate and Mn 2+ Activated zinc phosphate, but the luminous brightness and afterglow time have not yet met the practical requirements. Recently, the trivalent ion Eu 3+ or Eu 3+ , Dy 3+ Coactivated Sr 3 Al 2 o 6 The peak emission wavelength of the fluorescent powder is red at 620nm, but the excitation wavelength is around 255nm, the active ion is triv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 王达健张红梅
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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