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Preparation and application of an alkaline earth aluminate blue fluorescent material

A technology of blue fluorescent and fluorescent materials, which is applied in the preparation and application of alkaline earth aluminate blue fluorescent materials, can solve the problems of large environmental damage of chlorine-containing waste gas and difficult control of the preparation process, and achieves chemical stability and luminous heat. Good stability, stable performance and high luminous efficiency

Active Publication Date: 2019-11-05
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to improve the luminous efficiency, chemical stability and luminous stability of fluorescent materials; the preparation process is difficult to control, and the chlorine-containing waste gas produced is relatively harmful to the environment, etc.

Method used

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  • Preparation and application of an alkaline earth aluminate blue fluorescent material
  • Preparation and application of an alkaline earth aluminate blue fluorescent material
  • Preparation and application of an alkaline earth aluminate blue fluorescent material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] According to the chemical formula Ba 7.999 Ce 0.001 Al 2 o 11 The stoichiometric ratio of each element in the formula is weighed separately from barium carbonate BaCO 3 : 6.314 g, aluminum oxide Al 2 o 3 : 0.41 g, cerium oxide CeO 2 : 0.0007 g, placed in an agate mortar and mixed with an appropriate amount of absolute ethanol for half an hour, after mixing evenly, the sample was placed in a muffle furnace for pre-calcination. The pre-calcination conditions are: air atmosphere, calcination temperature 350° C., calcination time 2 hours. Then cool naturally to room temperature, take out the sample, grind the pre-calcined raw material fully again by the same method, mix evenly, calcinate again in air atmosphere, sinter at 650°C for 2 hours, cool to room temperature, and grind and mix again, in In the air atmosphere, sinter at 1350°C for 2 hours, cool to room temperature, take it out and grind it thoroughly to get the sample.

[0043] See attached figure 1 , is the ...

Embodiment 2

[0048] According to the chemical formula Ba 7.995 Ce 0.005 Al 2 o 11 The stoichiometric ratio of each element in the formula is weighed separately from barium carbonate BaCO 3 : 6.31 g, aluminum nitrate nonahydrate Al(NO 3 ) 3 9H 2 O: 3 grams, cerium oxide CeO 2 : 0.0035 g, add appropriate amount of ethanol to the agate mortar, mix and grind evenly, then pre-calcine in the air atmosphere, calcined at 450 ° C for 4 hours and cool in the furnace, take out the sample, and use the same method to fully dry the pre-calcined raw materials again Grinding, calcining again in air atmosphere, sintering at 800°C for 3 hours, cooling to room temperature, taking out the sample. Finally, the sample was thoroughly ground and mixed again, sintered at 1300°C for 4 hours in an air atmosphere, cooled to room temperature, taken out and fully ground to obtain the sample.

[0049] The X-ray powder diffraction pattern, excitation spectrum, fluorescence spectrum, luminescence decay curve, and ...

Embodiment 3

[0051] According to the chemical formula Ba 7.993 Ce 0.007 Al 2 o 11 The stoichiometric ratio of each element in the element, respectively weighed barium nitrate Ba (NO 3 ) 2 : 4.18 g, aluminum oxide Al 2 o 3 : 0.2 g, cerium oxide CeO 2 : 0.0024 g, add an appropriate amount of ethanol to the agate mortar, mix and grind evenly, pre-calcine in the air atmosphere, and calcine at 500 ° C for 4 hours. After cooling naturally, take out the sample and use the same method to fully Grind and mix well, calcinate again in air atmosphere, sinter at 850°C for 5 hours, and take out the sample after cooling. Finally, the sample was ground for the third time, mixed and placed in a muffle furnace, sintered at 1250°C for 6 hours in an air atmosphere, cooled to room temperature, taken out and fully ground to obtain a sample.

[0052] The X-ray powder diffraction pattern, excitation spectrum, fluorescence spectrum, luminescence decay curve, and SEM pattern of the sample prepared by the te...

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Abstract

The invention relates to a preparation method and application of a blue fluorescent material excited and emitted by near ultraviolet light. Its general chemical formula is Ba 8‑x Ce x Al 2 o 11 , where x is Ce 3+ Doping molar ratio, 0.001≤x≤0.4. The present invention can adopt high-temperature solid-phase method or chemical synthesis method, and the phosphor powder prepared can emit blue fluorescence near 450 nanometers under near-ultraviolet light excitation, and can be used as a fluorescent material for lamps or plasma displays to improve its photoelectric conversion efficiency and performance stability.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to the preparation and application of an alkaline earth aluminate blue fluorescent material. Background technique [0002] In recent years, energy shortage and environmental pollution have become two major problems that all human beings must face, and energy conservation and emission reduction have become an important issue currently. On the other hand, with the improvement of living standards, people's demand for artificial light sources is also increasing. The popularization and use of artificial light sources is also a reflection of a country's economy and living standards. According to statistics, in developed countries, lighting electricity consumption accounts for 20% of the total electricity consumption, while in my country it has reached 12% of the total electricity consumption. It can be seen that the use of energy-saving and efficient lighting fixtu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64H01L33/50
CPCC09K11/7721H01L33/502
Inventor 乔学斌禚昌岩
Owner XUZHOU NORMAL UNIVERSITY