Method for directly chemically synthesizing rare-earth vanadium-doped yttrium phosphate nanocrystalline material

A nanocrystalline material and rare earth doping technology, applied in chemical instruments and methods, nanotechnology, luminescent materials, etc., can solve the problems of easy agglomeration of rare earth doped vanadium yttrium phosphate nanocrystals, high energy consumption, environmental pollution, and uneven particle size and other issues to achieve unique competitive advantages, low cost, and low energy consumption

Inactive Publication Date: 2010-05-26
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing rare earth-doped vanadium phosphate nanocrystal materials by direct chemical synthesis, which solves the problem that the rare earth-doped vanadium phosphate nanocrystals prepared by the existing preparation method are easy to agglomerate, have uneven particle size, The shape is not easy to control, and there are problems of high energy consumption and environmental pollution

Method used

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  • Method for directly chemically synthesizing rare-earth vanadium-doped yttrium phosphate nanocrystalline material
  • Method for directly chemically synthesizing rare-earth vanadium-doped yttrium phosphate nanocrystalline material
  • Method for directly chemically synthesizing rare-earth vanadium-doped yttrium phosphate nanocrystalline material

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Embodiment 1

[0042] 0.091mol yttrium nitrate is dissolved in 1000ml dehydrated alcohol and is placed in the reflux vessel; 0.009mol europium oxide (Eu 2 o 3 ) was dissolved in 3g concentrated nitric acid (63wt%) to obtain an aqueous solution of europium nitrate, then diluted with 200ml of deionized water to obtain a transparent solution, and moved into the above-mentioned reflux container to obtain a mixed solution A; 0.05mol ammonium metavanadate, 0.05mol hydrogen phosphate Dissolve diammonium and 0.10mol-0.20mol ammonia water into 300ml deionized water to obtain a mixed solution B; dissolve 0.05mol caustic soda into 100ml absolute ethanol to obtain a solution C; put the mixed solution A in the above-mentioned reflux container at a constant temperature around 76°C Reflux, add solution C dropwise, and adjust the pH value of mixed solution A to 5-7; then, start to drop mixed solution B evenly into mixed solution A, and add solution C appropriately during the period to control the pH value b...

Embodiment 2

[0044] Dissolve 0.08mol yttrium chloride and 0.02mol europium nitrate in a mixed solvent of 150ml ethanol and 1000ml deionized water to obtain a solution, and move it into a reflux container to obtain a mixed solution A; 0.05mol ammonium metavanadate, 0.05mol hydrogen phosphate Dissolve diammonium and 0.10mol-0.20mol ammonia water into 500ml deionized water to obtain mixed solution B; dissolve 0.05mol caustic soda into 100ml absolute ethanol to obtain solution C; put the mixed solution A in the above-mentioned reflux container at a constant temperature around 76°C Reflux, add solution C dropwise, and adjust the pH value of mixed solution A to 5-7; then, begin to drop mixed solution B evenly into mixed solution A, during which solution C is added dropwise to control the pH value between 5-7. After the dropwise addition is completed, continue the constant temperature reaction for 4h-6h to fully crystallize the nanocrystals; then alternately wash with ethanol, methanol, and deioni...

Embodiment 3

[0046] Dissolve 0.085mol of yttrium nitrate and 0.015mol of terbium chloride in 1000ml of absolute ethanol and place in a reflux container, then dilute with 1000ml of deionized water to obtain mixed solution A; mix 0.05mol of ammonium metavanadate, 0.05mol of sodium phosphate and 0.10mol of - Dissolve 0.20mol of ammonia water into 1000ml of deionized water to obtain mixed solution B; dissolve 0.025mol of caustic soda into 100ml of absolute ethanol to obtain solution C; reflux the above-mentioned mixed solution A in the reflux container near a constant temperature of 76°C, and add the solution dropwise C. Adjust the pH value of the mixed solution A to 5-7; then, start to evenly drop the mixed solution B into the mixed solution A, during which the solution C is properly added to control the pH value between 5-7. After the dropwise addition is completed, continue the constant temperature reaction for 4h-6h to fully crystallize the nanocrystals; then alternately wash with ethanol, ...

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Abstract

The invention discloses a method for directly chemically synthesizing a rare-earth vanadium-doped yttrium phosphate nanocrystalline material, which comprises the following steps: dissolving rare-earth inorganic salts and yttric inorganic salts in an alcohol-deionized water solution to obtain a mixed solution A; dissolving vanadates, phosphates, ammonia water or caustic soda in an alcohol-deionized water solution to obtain a mixed solution B; dissolving caustic soda in alcohol or dissolving ammonia water in deionized water to obtain a solution C; and dropwise adding the mixed solution B and the solution C into the mixed solution A, regulating the pH value of the solution in a return passage at 5-7 all the time, keeping the temperature for 2-6 hours to obtain a precipitate, washing, separating, precipitating, drying and grinding to obtain the rare-earth vanadium-doped yttrium phosphate nanocrystalline material. The method of the invention can directly synthesize the rare-earth vanadium-doped yttrium phosphate nanocrystalline material approximately at room temperature without high-heat treatment; the invention can control the appearance of the nanocrystalline conveniently and stably; and the invention has the advantages of low cost, low energy consumption and no pollution, belongs to green chemical synthesis technique and has favorable application advantages and competitive advantages.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing nanocrystalline materials, in particular to a method for directly chemically synthesizing rare earth-doped vanadium yttrium phosphate nanocrystalline materials. Background technique [0002] Color plasma flat panel display (PDP) is one of the most competitive high-tech in flat panel display in the 21st century. The principle of PDP color generation is to use vacuum ultraviolet light to excite phosphor powder to produce three primary colors. Therefore, the performance of phosphor powder directly determines the display performance of PDP. At present, the commercial red phosphor still uses the traditional Y 2 o 3 , (Y, Gd)BO 3 Luminescent materials for lamps are insufficient in many aspects such as luminous efficiency, thermal stability, and color purity. It is urgent to find new luminescent materials to meet the performance requirements of color...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00C09K11/83
Inventor 赵鹏范菲张卫华赵彦珍李倩左庆辉
Owner XIAN UNIV OF TECH
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