Red bismuth phosphate fluorescent material, preparation method and application thereof

Abstract

The invention relates to a red bismuth phosphate fluorescent material, a preparation method and application thereof. The chemical formula of the red bismuth phosphate fluorescent material is Ca18Li3BixEu1-x(PO4)14. The raw materials include: an Ca-containing oxide or a compound transformable into the oxide serving as the Ca source; an Li-containing oxide or a compound transformable into the oxide serving as the Li source; an Eu-containing oxide, chloride or nitrate serving as the Eu source; a Bi-containing oxide, hydroxide serving as the Bi source; and a P-containing oxide or a compound transformable into an oxide of P serving as the P source. The preparation method includes: mixing the raw materials, firstly performing heating to 800DEG C< conducting heat preservation for 2h, then raising the temperature to 1180DEG C, conducting heat preservation for 8h, then performing tube furnace cooling to room temperature. The red bismuth phosphate fluorescent material provided by the invention has the characteristics of simple preparation method, high thermal stability and chemical stability, the product is easy for mass production, and has great industrial application value.

Description

technical field [0001] The invention relates to a red bismuth phosphate fluorescent material and its preparation method and application, in particular to a red bismuth phosphate fluorescent material used for photoluminescence in semiconductor lighting and its preparation method and application. Background technique [0002] At the end of the 19th century, Edison invented the electric light, which rewrote the history of human lighting for the first time. Although the luminous efficiency of the current incandescent lamp can reach 15-25 lumens / watt, its energy conversion efficiency is only 5%, and the remaining 95% of the energy is in the form of Loss in the form of heat. In the middle of the 20th century, fluorescent lamps, halogen lamps and other lighting equipment came out one after another, increasing the luminous efficiency to 61-100 lumens / watt, but the energy conversion efficiency was still only 25%. As global warming, energy crisis and environmental pollution become mo...

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Problems solved by technology

[0002] At the end of the 19th century, Edison invented the electric light, which rewrote the history of human lighting for the first time. Although the luminous efficiency of the current incandescent lamp can reach 15-25 lumens / watt, its energy conversion efficiency is only 5%, and the remaining 95% of the energy is in the form of heat loss

In the middle of the 20th century, fluorescent lamps, halogen lamps and other lighting equipment came out one after another, increasing the luminous efficiency to 61-100 lumens / watt, but its energy conversion efficiency is still only 25%.

Among them, the red fluorescent material with the best performance is Y 2 o 2 S:Eu 3+ , but they will pollute the environment due to the generation of sulfide by-products in the sulfate preparation process, and at a specific temperature, their chemical stability is poor, which directly affects the light conversion efficiency, Y 2 o 2 S:Eu 3+ The stability performance needs to be further improved

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