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Fluophosphate-based light-emitting material and preparation method thereof

A technology of luminescent materials and fluorophosphates, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as insufficient luminous efficiency

Inactive Publication Date: 2011-09-28
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If someone adopts Y 2 o 3 :Eu 3+ Alternative to (Y,Gd)BO 3 :Eu 3+ , Y 2 o 3 :Eu 3+ The main emission peak is located at 611nm (corresponding to Eu 3+ of 5 D. 0 → 7 f 2 transition), the color purity is better, but its luminous efficiency is insufficient (Y, Gd)BO 3 :Eu 3+ 60% of

Method used

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  • Fluophosphate-based light-emitting material and preparation method thereof
  • Fluophosphate-based light-emitting material and preparation method thereof
  • Fluophosphate-based light-emitting material and preparation method thereof

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preparation example Construction

[0053] see Figure 14 , illustrating the flow of the preparation method of the fluorophosphate-based luminescent material according to the embodiment of the present invention, the preparation method includes the following steps:

[0054] S01: Select the raw material, that is, according to the chemical formula M y Re 1-x ln x PO 4 f y The molar ratio of the corresponding elements in the selected alkali metal ion source compound, the source compound of the phosphate ion, the source compound of the rare earth ion, the source compound of the Ln ion and the source compound of the fluoride ion, the source compound of the phosphate ion is molar Specific excess 5%-30%, M is an alkali metal element, Re is a rare earth element, Ln is Dy or Eu, x=0.005-0.5, y=1 or 2;

[0055] S02: mixing each source compound;

[0056] S03: pre-sintering the mixture, and then cooling;

[0057] S04: taking out the pre-sintered product, grinding it, and then calcining the ground product to obtain the...

Embodiment 1

[0064] Weigh (NH 4 ) 2 HPO 4 0.7263 g, Na 2 CO 3 0.5299 grams, Gd 2 o 3 0.9017g, Dy 2 o 3 0.0047 g, NH 4 F 0.5185 (excess 40%, mole fraction, the same below) After the raw materials are ground and mixed thoroughly, they are first sintered in an air atmosphere at 300°C for 3 hours, taken out and ground evenly, then calcined in an air atmosphere at 800°C for 8 hours, and cooled naturally to At room temperature, take it out and grind it finely to get Na 2 Gd 0.995 Dy 0.005 PO 4 f 2 white phosphor. Of which (NH 4 ) 2 HPO 4 Relative to this chemical formula, the molar ratio is excessive by 10%, that is, according to the chemical formula, the molar ratio of Na and P is 2: 1, and the molar ratio of Na and P in the raw materials provided in this embodiment is 2: 1.1, NH 4 F is 40% in excess relative to the molar ratio in the chemical formula, and the calculation method is the same as above, and the excess calculation method of each raw material in the following exa...

Embodiment 2

[0066] Weigh (NH 4 ) 2 HPO 4 0.7263 g, Na 2 CO 3 0.4240 g, K 2 CO 3 0.1382 grams, Gd 2 o 3 0.8881g, Dy 2 o 3 0.0187 g, NH 4 F 0.5185 grams of raw materials are ground and mixed thoroughly, then sintered in an air atmosphere at 300°C for 3 hours, taken out and ground evenly, then calcined in an air atmosphere at 650°C for 6 hours, cooled naturally to room temperature, taken out and ground to obtain Na 1.6 K 0.4 Gd 0.98 Dy 0.02 PO 4 f 2 white phosphor.

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Abstract

The invention provides a fluophosphate-based light-emitting material and a preparation method thereof. The light-emitting material has a chemical formula of MyRe1-xLnxPO4Fy, wherein M is an alkali metal element, Re is a rare earth element, Ln is Dy or u, x is 0.05-0.5 and y is 1 or 2. The preparation method comprises the following steps of: selecting source compounds of corresponding ions according to the mol ratios of corresponding elements in the formula and allowing the source compounds in phosphate radical ions to be exceeded by 5-30 percent according to the mol ratio; mixing the source compounds; carrying out pre-sintering treatment on the mixture and cooling; and taking out a sintered substance, grinding and calcining to obtain the light-emitting material. In the light-emitting material, the fluophosphate matrix is utilized to strongly absorb a vacuum ultraviolet waveband so as to increase the light-emitting efficiency; meanwhile, the fluophosphate matrix has stable physicochemical characteristics. The material has the advantages of low preparation temperature, energy saving, cost reduction and broad production and application prospects.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a fluorophosphate-based luminescent material and a preparation method thereof. Background technique [0002] With the deterioration of the living environment of human beings, protecting the environment has become the consensus of all mankind. Among the currently mainly used lighting sources, low-pressure mercury vapor discharge is mostly used as the excitation light source. However, mercury has the following disadvantages: mercury vapor is poisonous, which affects human health after inhalation, and even threatens human life. At the same time, the pollution of mercury to soil is irreversible. Therefore, in consideration of environmental protection and application fields, it is necessary to develop a better excitation light source. [0003] Therefore, the development of mercury-free fluorescent lamps is one of the key directions for future research. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
Inventor 周明杰刘军梁小芳廖秋荣田梓峰
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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