Cerium, gadolinium activated yttrium aluminium garnet fluorescent powder and preparation method

Abstract

The invention relates to a cerium, gadolinium activated yttrium aluminium garnet fluorescent powder and preparation method, wherein the fluorescent powder is prepared from yttrium oxide, aluminium oxide, cerium oxide, gadolinium oxide, boric acid, barium fluoride, carbon powder, anhydrous alcohol as raw material, cerium oxide, gadolinium oxide and water as activating agent, boric acid and barium fluoride as fluxing agent, anhydrous alcohol as ball grinding medium, carbon powder as reducing agent through raw material mixing, grinding, ball grinding, calcining in high temperature pipe heater, cooling down, grinding, sieving, detecting, packaging and storing.

Description

technical field [0001] The invention relates to a yttrium aluminum garnet fluorescent powder activated by cerium and gadolinium and a preparation method thereof, and belongs to the technical field of preparation methods of rare earth aluminate fluorescent materials. Background technique [0002] Yttrium aluminum garnet (abbreviated as YAG) is a rare earth aluminate garnet synthesized by the reaction of yttrium oxide and alumina. It belongs to the cubic crystal system and is a crystal with high hardness and high melting point. It has good mechanical strength , chemical stability, and thermal conductivity, it is a single crystal material with excellent performance. Due to the radius of the trivalent rare earth ion and Y 3+ radius of ( r Y 3 + = 0.096 nm ) Similar, easy to incorporate and replace Y 3+ Ions can obtain differe...

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Problems solved by technology

[0006] For example: the high-temperature solid-state reaction method is a traditional synthesis method, the process flow is simple, no complicated equipment is required, and it is beneficial to industrial production, but the synthesis temperature is high, above 1500°C, the reaction time is long, above 10 hours, and the production equipment is easy. Damaged, coarse phosphor particles, easy to agglomerate, many impurity phases, difficult to obtain single-phase cubic garnet structure

[0007] For example, the sol-gel method generally uses organometallic alkoxides as raw materials, and through steps such as hydrolysis, polycondensation, drying, and sintering, particles with smaller particle sizes can be obtained without grinding, but the process is long and the water is wrapped in the colloid. Not easy to lose, metal alkoxide as raw material, high cost, toxic, polluting, harmful to human body, affecting the luminous brightness of luminescent powder

[0008] For example: precipitation method is divided into uniform precipitation method and co-precipitation method. Uniform precipitation method is to slowly generate precipitation when metal salt solution and precipitant solution are mixed. Co-precipitation method is used to synthesize two or more metal elements The precipitation method solves the shortcomings of the sol-gel method, and the raw materials used are all inorganic, low cost, easy to dry, and no carbon pollution, but there are differences in the concentration and precipitation speed of precipitation between components , the uniformity of the microscopic composition cannot be achieved, and the synthesis products are seriously agglomerated, and the luminous efficiency is low

[0009] For example: Combustion method is an exothermic reaction between organic fuel and metal salt solution. The reaction system can be heated up to 1600°C to generate a large amount of gas. The reaction is rapid. The whole reaction process only takes tens of seconds. The product particle size is small and the particle size distribution is small. Uniform, but it is easy to introduce carbon elements in the combustion process, which reduces the purity of the product

[0010] For example: Microwave irradiation method is a newly emerging method, using microwave irradiation to force hydrolysis or microwave irradiation precursor pyrolysis, various single or composite oxide ultrafine powders can be produced, so that the system can be used in many Uniform heating in a short period of time, washing, drying, and calcination at 900 ° C to obtain a single yttrium aluminum garnet, but most of the raw materials are oxides that rarely absorb microwaves, and certain measures must be taken to effectively use the microwave method to synthesize The method is difficult and is still in the period of exploration and research

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