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Preparation method of red fluorescent powder

A red phosphor and phosphor technology, applied in the field of fluorescent materials, can solve the problems of poor particle dispersibility, difficult control of shape and size, etc., and achieve the effects of dense particles, easy control of shape and size, and reliable implementation.

Pending Publication Date: 2021-03-16
徐州安达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to provide a method for preparing red phosphorous nitrogen oxides for white light LEDs by a method of molten salt high-temperature roasting and nitriding, so as to solve the problem of poor particle dispersion and poor morphology in the prior art. And the size is difficult to control, at the same time, the method has simple process, controllable cost, flexible scale, and is suitable for industrial production

Method used

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  • Preparation method of red fluorescent powder
  • Preparation method of red fluorescent powder
  • Preparation method of red fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to chemical formula (Sr 0.9 Ca 0.06 Nb 0.04 ) Si 2 Al 3 N 5 o 3 The stoichiometric ratio weighs analytically pure Al 2 o 3 , Si 3 N 4 , SrO, CaO and Nb 2 o 3 , Grind and mix the above principles and press it into a green body, and pre-fire it at 800°C for 3 hours in an air atmosphere. The calcined product is ground and crushed, and 10% of BaF is added 2 As a molten salt medium, it is calcined for the second time under nitrogen atmosphere, the nitrogen pressure is 0.6Mpa, the calcining temperature is 1700°C, and the time is 6 hours. The calcined product was washed three times with 10% hydrochloric acid and deionized water, and dried to obtain the product.

[0020] from figure 1 with figure 2 Look, the final product particles are independently dispersed, with high density, no impurities, and high purity.

Embodiment 2

[0022] According to chemical formula (Sr 0.95 Ce 0.05 )Si1Al 4 N 4 o 5 The stoichiometric ratio weighs analytically pure Al 2 o 3 , Si 3 N 4 , SrCO 3 and CeO 2 Grind and mix the above principles to form an embryo body, and pre-fire at 900°C for 4 hours in an air atmosphere. The calcined product is ground and broken, and 5% BaF is added 2 As a molten salt medium, it is calcined for the second time under nitrogen atmosphere, the nitrogen pressure is 0.8Mpa, the calcining temperature is 1800°C, and the time is 4 hours. The calcined product was washed three times with 10% hydrochloric acid and deionized water, and dried to obtain the product. In Example 2, a pure substance was also obtained without impurity elements. The obtained emission spectra were compared with (Sr 0.95 Ce 0.05 )Si1Al 4 N 4 o 5 unanimous.

Embodiment 3

[0024] According to the chemical formula SrSi1Al 4 N 2 o 6 The stoichiometric ratio weighs analytically pure Al 2 o 3 , Si 3 N 4 , SrCO 3 , Grind and mix the above principles and press it into a green body, and pre-fire it at 900°C for 3 hours in an air atmosphere. The calcined product is ground and broken, and 8% BaF is added 2 As a molten salt medium, it is calcined for the second time under nitrogen atmosphere, the nitrogen pressure is 0.5Mpa, the calcining temperature is 1900°C, and the time is 8 hours. The calcined product was washed three times with 10% hydrochloric acid and deionized water, and dried to obtain the product.

[0025] In Example 3, a pure substance was also obtained without impurity elements, and the particles were independently dispersed with high density.

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Abstract

The invention discloses a preparation method of red fluorescent powder and belongs to the technical field of fluorescent materials. The preparation method comprises the following steps: pressing ground and uniformly mixed raw materials, and then carrying out calcination pretreatment in an air atmosphere; grinding and crushing the calcined product, adding molten salt, and carrying out secondary high-temperature nitridation treatment in a nitrogen atmosphere; and washing the obtained product with diluted hydrochloric acid and deionized water respectively, and conducting drying to obtain the nitrogen oxide fluorescent powder. The operations of mixing, grinding and the like can be performed in air, and the process is simple. The scheme is reliable to implement and low in cost, meanwhile, the problem of sintering agglomeration of particles in the high-temperature calcining process is solved, the particle dispersity is good, and the morphology and the size are uniform step by step.

Description

technical field [0001] The invention belongs to the technical field of fluorescent materials, and in particular relates to a preparation method of red fluorescent powder. Background technique [0002] White light-emitting diodes (LEDs) have the advantages of small size, low calorific value, low power consumption, long life and environmental protection. They are considered to be a new generation of lighting sources to replace incandescent lamps and fluorescent lamps. Research. Most of the white LED lamps currently on the market use blue light chips to excite yellow phosphors to obtain white light. Due to the lack of red light emission in the commonly used yellow phosphors, the resulting white light is colder, with a higher color temperature and a lower color rendering index. In order to solve this problem, in recent years, people have begun to try to mix red phosphor powder into yellow phosphor powder. This method can effectively make up for the lack of red light components,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67C09K11/80C09K11/64H01L33/50
CPCC09K11/676C09K11/7721C09K11/646C09K11/0883H01L33/502H01L2933/0041
Inventor 胡鹏陈章平
Owner 徐州安达科技有限公司
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