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Method for preparing nitrogen oxide phosphor powder

A technology of nitrogen oxides and phosphors, which is applied in the field of phosphor powder preparation, can solve the problems of increasing the difficulty of preparation, and achieve the effects of increasing the difficulty of preparation, good uniformity, and good product appearance

Inactive Publication Date: 2013-06-19
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, regarding the preparation of multi-system nitrogen oxide phosphors by this method (please refer to the Chinese patent application with application number 200910056464.3), the nitriding atmosphere used is mainly a mixture of ammonia gas and hydrocarbon gas, which increases the difficulty of preparation

Method used

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  • Method for preparing nitrogen oxide phosphor powder
  • Method for preparing nitrogen oxide phosphor powder
  • Method for preparing nitrogen oxide phosphor powder

Examples

Experimental program
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Embodiment 1

[0028] In the present embodiment, the nitrogen oxide fluorescent powder to be prepared is (Y 5.9 Ce 0.1 ) Si 3 o 9 N 4 , where the metal components are Y and Ce, and the nitride is Si 3 N 4 . According to (Y 5.9 Ce 0.1 ) Si 3 o 9 N 4 Weigh the nitrate Y of Y (NO 3 ) 3 ·6H 2 O(AR) 22.5976 g, Ce nitrate Ce(NO 3 ) 3 ·6H 2 O (99.99%) 0.4342 g and nitride Si 3 N 4 (AR) 1.4028 g, dissolved in distilled water, mixed thoroughly to make 100ml milky white suspension A; add 5ml polyethylene glycol to suspension A, stir well to obtain suspension B; add ammonia water dropwise to adjust suspension B Keep the pH at 6. The suspension B was ultrasonically oscillated for 30 minutes to obtain a uniform and stable suspension C; the suspension C was placed in a muffle furnace and heat-treated at 500°C for 2 hours to obtain the precursor powder D ; Precursor powder D is packed in a graphite crucible, and is calcined in a reducing atmosphere at a temperature of 1300°C for 7 hours, ...

Embodiment 2

[0030] In the present embodiment, the nitrogen oxide fluorescent powder to be prepared is (Y 5.5 Ce 0.5 ) Si 3 o 9 N 4 , where the metal components are Y and Ce, and the nitride is Si 3 N 4 , according to (Y 5.5 Ce 0.5 ) Si 3 o 9 N 4 Weigh the hydrochloride YCl of Y 3 ·6H 2 O(AR) 25.0272 g, the hydrochloride CeCl of Ce 3 ·6H 2 O (99.99%) 2.6590 g and nitride Si 3 N 4 (AR) 2.1042 g, dissolved in distilled water, mixed thoroughly to make 100ml milky white suspension A; add 5ml polyethylene glycol to suspension A, stir well to obtain suspension B, then add ammonia water dropwise to adjust the suspension B, and maintain the pH of suspension B at 6. The suspension B was ultrasonically oscillated for 30 minutes to obtain a uniform and stable suspension C; the suspension C was placed in a muffle furnace and heat-treated at 500°C for 2.5 hours to obtain the precursor powder D ; Precursor powder D is packed in a graphite crucible, and calcined in a reducing atmosphere ...

Embodiment 3

[0032] In this embodiment, the nitrogen oxide phosphor to be prepared is (Sr 0.9 Yb 0.1 )SiAl 2 N 2 o 3 , where the metal components are Sr, Al and Yb, and the nitride is Si 3 N 4 and AlN, according to (Sr 0.9 Yb 0.1 )SiAl 2 N 2 o 3 Weigh the Sr nitrate Sr(NO 3 ) 2 (AR) 5.7140 grams, Al nitrate Al (NO 3 ) 3 ·6H 2 O(AR) 15.0056 g, the nitrate of Yb Yb(NO 3 ) 3 ·5H 2 O (99.99%) 1.3474 g, nitride Si 3 N 4 (AR) 1.4028 g, nitride AlN (AR) 0.8198 g, dissolved in distilled water, mixed thoroughly to make 100 ml milky white suspension A; add 8 ml polyethylene glycol to suspension A, stir well, to obtain suspension B , drop ammonia water, adjust the pH value of the solution, and keep the pH value of Suspension B at 6. The suspension B was ultrasonically oscillated for 30 minutes to obtain a uniform and stable suspension C; the suspension C was placed in a muffle furnace and heat-treated at 500°C for 3 hours to obtain the precursor powder D ; Precursor powder D is p...

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Abstract

The invention discloses a method for preparing nitrogen oxide phosphor powder. Salt and nitride of a metal component in the nitrogen oxide phosphor powder to be prepared are taken as raw materials, and the method comprises the following steps of: weighing the raw materials according to the stoichiometric proportion of the phosphor powder to be prepared, and dissolving the raw materials in water to prepare first suspension; adding a dispersant polyethylene glycol into the first suspension, fully dispersing the dispersant to prepare second suspension, and controlling the volume ratio of the dispersant to the first suspension to be 5-8:100; dropping ammonia water into the second suspension to make the pH value of the second suspension be 5-6; ultrasonically oscillating the second suspension in ultrasonic waves to prepare uniform and stable third suspension; putting the third suspension into a heating furnace, and performing thermal treatment at the temperature of between 500 and 600 DEG C for 2 to 3 hours to prepare precursor powder; and putting the precursor powder into a crucible, and calcining in the reducing atmosphere at the temperature of between 1,300 and 1,400 DEG C for 4.5 to 7 hours to prepare the required phosphor powder.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, and is mainly used for display devices such as cathode ray tubes (CRTs), field emission displays (FEDs), plasma displays (PDPs), electroluminescence (ELs), fluorescent display tubes, fluorescent lamps, and semiconductor lighting. In lighting devices such as violet light to blue light, it particularly relates to a method for preparing fluorescent powders that emit visible light or white light. Background technique [0002] White LED is a solid-state semiconductor device that converts electrical energy into white light, also known as semiconductor lighting. It has many advantages such as high efficiency, small size, long life, safety, low voltage, energy saving, and environmental protection. , Fluorescent lamps, and high-pressure gas discharge lamps are the fourth generation of lighting sources, which will be the mainstream products in the future lighting market. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79C09K11/80
Inventor 邓德刚王倩徐时清赵士龙黄立辉王焕平李晨霞
Owner CHINA JILIANG UNIV
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