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Green-emitting rare earth phosphate phosphor precursor, green-emitting phosphor and preparation method

A green phosphor and rare earth phosphate technology, applied in the field of green phosphor and its preparation, rare earth phosphate green phosphor precursor and its preparation, can solve the problem of small particle size of phosphor, and achieve high luminous efficiency and particle size The effect of narrow distribution and moderate particle size

Inactive Publication Date: 2010-07-07
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the (La, Ce, Tb)PO prepared by this method 4 The particle size of the phosphor is too small, only 0.05-1um

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Press Zn 0.3 Al 0.1 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 1.3 The stoichiometric ratio was weighed La 2 o 3 (4N), CeO 2 (4N), Tb 4 o 7 (4N), ZnO(AR), AlCl 3 (AR), (NH 4 ) 2 HPO 4 (AR), above-mentioned rare earth raw material is dissolved with nitric acid to obtain the rare earth nitrate mixed solution that the total concentration of rare earth is 0.05mol / L; And with nitric acid, ZnO is dissolved and obtained concentration is the Zn(NO 3 ) 2 solution; the AlCl 3 Dissolved in water to make a solution of 0.075mol / L, then (NH 4 ) 2 HPO 4 Dissolved in water to prepare a solution with a concentration of 1mol / L NH 4 Dissolve F in water to make a 0.3mol / L solution, ammonia water to make a 3mol / L solution, and phosphoric acid to make a 0.05mol / L solution.

[0039] Add the mixed solutions of lanthanum cerium terbium nitrate solution, diammonium hydrogen phosphate and ammonia water respectively into the container containing phosphoric acid aqueous solution, and mainta...

Embodiment 2

[0041] Press La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 0.9 f 0.3 The stoichiometric ratio measures LaCl separately 3 , CeCl 3 , TbCl 3 , weighed (NH 4 ) 2 HPO 4 (AR), NH 4 F(AR), the above-mentioned rare earth raw material is diluted with water to obtain the rare earth mixed solution that the total concentration of rare earth is 2mol / L; (NH 4 ) 2 HPO 4 Dissolved in water to prepare a solution NH with a concentration of 0.5mol / L 4 F is dissolved in water to prepare a 0.3mol / L solution, ammonia water is prepared to be 3mol / L, and hydrochloric acid is prepared to be 0.5mol / L.

[0042] Add the mixed solution of lanthanum cerium terbium chloride solution, diammonium hydrogen phosphate and ammonia water into the container containing aqueous hydrochloric acid solution, and maintain the reaction temperature at 80°C. PO 4 3- / RE 3+ The molar ratio is 2.0, and the pH of the solution is controlled to be 1.0. After the feeding is completed, ammonium fluoride is added to make the mo...

Embodiment 3

[0044] Press Al 0.1 La 0.55 Ce 0.3 Tb 0.15 (PO 4 ) 0.9 f 0.6 The stoichiometric ratio measures La respectively 2 (SO 4 ) 3 、Ce 2 (SO 4 ) 3 , Tb 2 (SO 4 ) 3 , weigh Na 2 HPO 4 (AR), NH 4 F(AR), dilute the above rare earth raw materials with water to obtain a rare earth mixed solution with a total rare earth concentration of 1mol / L; sodium hydroxide is prepared into a 3mol / L solution, and phosphoric acid is prepared into a 2mol / L solution.

[0045] The mixed solutions of lanthanum cerium terbium sulfate solution, disodium hydrogen phosphate and sodium hydroxide were respectively added to the container containing phosphoric acid aqueous solution, and the reaction temperature was maintained at 30°C. PO 4 3- / RE 3+ The molar ratio is 1.2, and the pH of the solution is controlled to be 3. After the feeding is completed, ammonium fluoride and aluminum nitrate solids are added to make the molar ratio of ammonium fluoride, aluminum nitrate and rare earth to 0.4, and...

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PUM

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Abstract

The invention relates to a green-emitting rare earth phosphate phosphor precursor, green-emitting phosphor and a preparation method, wherein, the precursor comprises at least one element of Zn, Al, Li, Na, K, F elements. The chemical expression is as follows: MaLnxCeyTb1-x-y (PO4) nFb. The green-emitting rare earth phosphate phosphor precursor is prepared by a liquid phase precipitation method. The molecular formula of the green-emitting phosphor prepared by the precursor is MaLnxCeyTb1-x-y (PO4) nFb. The prepared green-emitting rare earth phosphate phosphor with regular appearance, moderate granularity is suitable for preparation of the green-emitting rare earth phosphate phosphor, has simple preparation method, and is easy to realize industrialization; the surface of the obtained green-emitting phosphor particles is smooth, the surface or the performance of the green-emitting phosphor body is greatly reduced, the reunion between the particles is decreased, and the inoxidability is increased. The size of the powder grainsize is moderate, the distribution of the granularity is narrow, and therefore, high luminous efficiency and good thermal stability are provided.

Description

technical field [0001] The invention relates to a rare earth phosphate green phosphor precursor, green phosphor and a preparation method thereof, in particular to a rare earth phosphate green phosphor containing at least one of Zn, Al, Li, Na, K and F elements A powder precursor and a preparation method thereof, and a green fluorescent powder prepared from the precursor and a preparation method thereof. Background technique [0002] Rare earth luminescent materials can be divided into red, green, and blue phosphors according to their luminescent colors, which are the raw materials for the three primary colors of phosphors. Among the three primary color phosphors, the green powder contributes the most to the luminous flux, and the main function of the red powder and the blue powder is to adjust the green light to white light. Rare earth phosphate ((La, Ce, Tb)PO 4 ) is a kind of green fluorescent powder in the commercial three-color fluorescent powder, which emits green flu...

Claims

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Application Information

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IPC IPC(8): C01B25/26C01B25/455C09K11/86
Inventor 张顺利黄小卫龙志奇韩业斌侯永可胡晓珊胡运生王良士赵娜
Owner GRIREM ADVANCED MATERIALS CO LTD
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