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A kind of nitrogen oxide fluorescent material with yellow-orange light type wollastonite structure and preparation method thereof

A fluorescent material, wollastonite technology, applied in the fluorescent field, achieves excellent high temperature resistance, simple preparation method, and easy operation

Inactive Publication Date: 2018-07-06
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the general view is that Eu 2+ and La 3+ There is a charge mismatch, Eu 2+ Unable to exist stably in La–Si–O–N compounds

Method used

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  • A kind of nitrogen oxide fluorescent material with yellow-orange light type wollastonite structure and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Analytical pure La 2 o 3 、Si 3 N 4 、Eu 2 o 3 As a raw material, according to La 0.94 SiO 2 N:0.06Eu 2+ The molar ratio of each element in the formula, accurate ingredients, put it in an agate mortar and grind for about 30 minutes, so that the raw materials are fully mixed and even. Transfer the mixed raw materials to an alumina crucible, nest a small corundum crucible in a large crucible with carbon powder, cover it and place it in an atmosphere furnace, and use a volume ratio of 10%:90% H 2 and N 2 The mixed gas is the reaction gas, keep the air pressure stable within the range of 0.1-2MPa, sinter at 1450°C for 12 hours, take it out after natural cooling, and grind again for about 15 minutes to obtain a single phase La 0.94 SiO 2 N:0.06Eu 2+ Phosphor.

Embodiment 2

[0022] Analytical pure La 2 o 3 、Si 3 N 4 、Eu 2 o 3 As a raw material, according to La 0.94 SiO 2 N:0.06Eu 2+ The molar ratio of each element in the formula, accurate ingredients, put it in an agate mortar and grind for about 30 minutes, so that the raw materials are fully mixed and even. Transfer the mixed raw materials to an alumina crucible, nest a small corundum crucible in a large crucible with carbon powder, cover it and place it in an atmosphere furnace, and use a volume ratio of 10%:90% H 2 and N 2 The mixed gas is the reaction gas, keep the air pressure stable in the range of 0.1-2MPa, sinter at 1500°C for 6 hours, take it out after natural cooling, and grind again for about 15 minutes to obtain a single-phase La 0.94 SiO 2 N:0.06Eu 2+ Phosphor.

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Abstract

The invention relates to a nitrogen oxide fluorescent material adopting a yellow-orange light type wollastonite structure and a preparation method of nitrogen oxide fluorescent material, and belongs to the technical field of fluorescence. The chemical composition formula of the fluorescent material is La(1-x)SiO2N:xEu<2+>, wherein x is the mole percentage of rare earth ions Eu<2+> doped in a substrate material La(1-x)SiO2N. Oxide or corresponding nitride in the structural formula is selected as a raw material, a carbothermal reduction nitridation method is adopted, reducing atmosphere in the reaction is maintained through coke and the like, and H2 and N2 mixed gas is used as reaction gas to be in high temperature reaction so as to obtain the fluorescent material. The fluorescent material has excellent luminous performance, has both the thermal performance and high temperature resistant performance, is environment-friendly, can be matched with near ultraviolet light emitting diodes, and is applied to the field of the white light LEDs. Besides, fluorescent powder prepared by the method is high in purity, easy to operate and free of environment pollution, and has a wide application prospect.

Description

technical field [0001] The invention relates to a nitrogen oxide fluorescent material with a yellow-orange light type wollastonite structure and a preparation method thereof, belonging to the field of fluorescent technology. Background technique [0002] Since 1996, white light-emitting diodes (LEDs) were successfully obtained by packaging blue-light Ga(In)N chips with YAG yellow-light phosphors, and the development of white-light LEDs has attracted great attention from many researchers. In recent years, white light LEDs have developed rapidly in research and industrial applications due to their high brightness, small size, fast response, energy saving, environmental protection, safety, and long service life. Therefore, it is considered to be the fourth generation of lighting sources after incandescent lamps, fluorescent lamps and high-intensity discharge lamps. [0003] Single-chip phosphor converted w-LED (pc-LED) is a method that has been applied and has potential to rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
CPCY02B20/00
Inventor 陈健刘艳改房明浩黄朝晖
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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