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White radiation fluorescent powder for LED excitated with ultraviolet and near ultraviolet and preparation method thereof

A near-ultraviolet and phosphor technology, which is applied in luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, can solve the problems of harsh preparation conditions, easy deliquescence, and sulfur pollution, and achieves a simple and feasible manufacturing method and stable performance. , easy to operate effect

Inactive Publication Date: 2008-09-24
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfide phosphors have poor chemical and thermal stability, are prone to deliquescence, and generate sulfur pollution, which limits their application.
In 2005, N.Hirosaki et al. reported β-SiAlON:Eu2+ green phosphor [Appl.Phys.Lett.86 (2005), 211905], which has good chemical and thermal Stability, can be effectively excited by ultraviolet or blue light, but its preparation conditions are harsh, usually synthesized under high temperature and high pressure conditions, or synthesized with metals and metal nitrides that are not easy to store in air, making it difficult to prepare

Method used

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  • White radiation fluorescent powder for LED excitated with ultraviolet and near ultraviolet and preparation method thereof
  • White radiation fluorescent powder for LED excitated with ultraviolet and near ultraviolet and preparation method thereof
  • White radiation fluorescent powder for LED excitated with ultraviolet and near ultraviolet and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] Weigh SrCO 3 0.9228 g, Al 2 o 3 0.3252 g, SrCl 2 ·6H 2 O 0.8502 g, Eu 2 o 3 0.0225 grams, fully ground and mixed, put into an alumina crucible, cover a layer of carbon powder in the raw material, cover the crucible lid, put it into a high-temperature furnace, bake at 1250 ° C for 2 hours, and take it out when cooled to 1000 ° C. After removing carbon, after grinding and dispersing, a phosphor powder for white light LED excited by ultraviolet and near ultraviolet is obtained, and its composition is Sr 2.96 Al 2 o 5 Cl 2 :Eu 0.04 .

Embodiment 2

[0022] Weigh SrCO 3 0.9153 g, Al 2 o 3 0.3259 g, SrCl 2 ·6H 2 O 0.8521 g, Eu 2 o 3 0.0225 g, CaO 0.0036 g, fully ground and mixed, put into an alumina crucible, cover a layer of carbon powder in the raw material, cover the crucible lid, put it in a high-temperature furnace, roast at 1250 ° C for 2 hours, and cool to 1000 Take it out at ℃, remove the carbon, grind and disperse, and obtain a phosphor powder for white light LED excited by ultraviolet and near ultraviolet, which consists of (Sr 2.94 Ca 0.02 )Al 2 o 5 Cl 2 :Eu 0.04 .

Embodiment 3

[0024] Weigh SrCO 3 0.9116 g, Al 2 o 3 0.3245 g, SrCl 2 ·6H 2 O 0.8486 g, Eu 2 o 3 0.0225 g, BaCO 3 0.0126 grams, fully ground and mixed, put into an alumina crucible, cover a layer of carbon powder in the raw material, cover the crucible lid, put it into a high-temperature furnace, bake at 1250 ° C for 2 hours, and take it out when cooled to 1000 ° C. Remove carbon, after grinding and dispersing, obtain a kind of fluorescent powder for white light LED excited by ultraviolet and near ultraviolet, its composition is (Sr 2.94 Ba 0.02 )Al 2 o 5 Cl 2 :Eu 0.04 .

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Abstract

The invention relates to ultraviolet and near ultraviolet excited phosphor powder used for white light LEDs and a method for preparing the phosphor powder. The formula of the phosphor powder is A3D2O5X2:Mx. In the formula, A is one or more than one of Mg, Ca, Sr and Ba; D is one or more than one of B, Al and Ga; X is one or two of Cl and F; M is one or two of Eu and Ce; x is more than or equal to 0.001 and less than or equal to 0.10. Hydrates, oxides or corresponding salts of the structural formula are used as raw materials and are calcinated for two to five hours at 1100 to 1300 DEG C in reducing atmosphere, and are cooled, thus preparing the ultraviolet and near ultraviolet excited phosphor powder used for white light LEDs. The phosphor powder is excited within the range from 200nm to 450nm; the emission wavelength ranges from 400nm to 700nm; the phosphor powder emits blue light, green light or white light, and can be used in ultraviolet and near ultraviolet excited white light LED devices.

Description

technical field [0001] The invention relates to a fluorescent powder for white light LED excited by ultraviolet and near ultraviolet and a preparation method thereof. Background technique [0002] White LEDs are small in size, energy-saving, long in life, and non-polluting, and have broad application value and prospects. At present, white light LEDs have been applied in many fields such as LCD backlights, indicator lights, and general lighting, and have a tendency to replace various bulbs and fluorescent lamps currently used. This new type of green light source will definitely become a new generation of lighting system, which has extensive and far-reaching significance for energy saving, environmental protection, and improving people's quality of life. [0003] White light LEDs can be obtained by combining blue LEDs with yellow phosphors. At present, white light is mainly obtained by combining YAG:Ce fluorescent materials with blue LEDs through the principle of complementar...

Claims

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Application Information

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IPC IPC(8): C09K11/86H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 尤洪鹏宋艳华刘松洪广言
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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