Yellow fluorescent powder used by white light LED and preparation method thereof

A technology of phosphor powder and production method, which is applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps, etc., to achieve the effects of simple steps and conditions, solving safety problems, and reducing requirements for high-temperature equipment

Active Publication Date: 2010-06-30
XIANGLING LED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional method, this method can effectively reduce the firing temperature by 50-100°C, does not need to use hydrogen to provide a reducing atmosphere, solves the safety problem of production, reduces the requirements for equipment, and can effectively improve the luminosity of phosphor powder. Luminescence intensity

Method used

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  • Yellow fluorescent powder used by white light LED and preparation method thereof
  • Yellow fluorescent powder used by white light LED and preparation method thereof
  • Yellow fluorescent powder used by white light LED and preparation method thereof

Examples

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Effect test

example 1

[0025] The composition of the phosphor is Y 2.94 Al 5 (O, F) 12 : 0.06Ce, the production method is as follows: Accurately weigh raw material Y 2 o 3 66.39g, Al 2 o 3 50.98g, CeO 2 2.01g, BaF 2 3.51g, the above raw materials are pre-mixed, then put into a 500ml ball mill jar and milled for 3 hours, the material is taken out and divided into 2 parts, and put into 2 alumina crucibles respectively, one crucible is not covered (sample number Y1 -1), the other crucible is covered (sample number Y1-2), and then put into an atmosphere box furnace for calcination at the same time, and kept at 1500°C for 4h, with a heating rate of about 10°C / min, and naturally cooled to At room temperature, NH is fed throughout the entire calcination process 3 Decomposition gas (75%H 2 +25%N 2 ). After cooling, the bulk powder is taken out, mechanically crushed, ball milled until the average particle size reaches 8.0±0.5um, soaked in hot water at 80°C to remove impurities, then passed thro...

example 2

[0027] The composition of the phosphor is Y 2.94 Al 5 (O, F) 12 : 0.06Ce, the production method is as follows: Accurately weigh raw material Y 2 o 3 66.39g, Al2 o 3 50.98g, CeF 3 2.37g, BaF 2 3.51g, pre-mix the above raw materials, and then put them into a 500ml ball mill jar for ball milling for 3 hours, put the evenly mixed materials into an alumina crucible, cover the crucible without sealing it with ceramic glaze, and put it into an atmosphere box furnace Medium calcination, heat preservation at 1500°C for 4 hours, the heating rate is about 10°C / min, naturally cool to room temperature after the heat preservation is completed, and NH is introduced throughout the calcination process 3 Decomposition gas (75%H 2 +25%N 2 ). After cooling, the bulk powder is taken out, mechanically crushed, ball milled until the average particle size reaches 8.0±0.5um, soaked in hot water at 80°C to remove impurities, then passed through a 400-mesh wet sieve, centrifuged and dried to...

example 3

[0029] The composition of the phosphor is Y 2.94 Al 5 (O, F) 12 : 0.06Ce, the production method is as follows: Accurately weigh raw material Y 2 o 3 66.39g, Al 2 o 3 50.98g, CeF 3 2.37g, BaF 2 3.51g, pre-mix the above raw materials, and then put them into a 500ml ball mill jar for ball milling for 3 hours, put the evenly mixed materials into an alumina crucible, cover the crucible, fill the groove on the edge of the crucible with ceramic glaze, and then Put it in a vacuum drying oven for vacuum-filling nitrogen treatment. After the treatment, put it in an atmosphere box furnace for calcination, keep it at 1500°C for 4 hours, and the heating rate is about 10°C / min. After the heat preservation is completed, cool it naturally to room temperature. High-purity N is introduced throughout the calcination process 2 (purity>99.99%). After cooling, the bulk powder is taken out, mechanically crushed, ball milled until the average particle size reaches 8.0±0.5um, soaked in hot...

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Abstract

The invention relates to a fluorescent powder used for a white light LED and a preparation method thereof. The chemical formula of the fluorescent powder is (A3-x) (Al5-2mBmCm) FnO12-n: xCe, wherein A is one or more of Y, Gd, La and Tb; B is one or more of Ti, Zr and V; C is one or two of Mn, Zn, Mg and Li; x is more than or equal to 0.03 and less than or equal to 0.1; m is more than or equal to 0.01 and less than or equal to 2; and n is more than or equal to 0 and less than or equal to 3x. The preparation method comprises the steps of coating a layer of high-temperature ceramic glaze material at the joint between a crucible cover and a crucible by using a high-temperature solid phase method and a self-pressurization sealing burning technique, putting the crucible into an atmosphere box type furnace to burn for 2 to 5 hours at 1450 to 1550 DEG C in the nitrogen atmosphere, smashing and screening after cooling so as to acquire the finished product of the fluorescent powder. The fluorescent powder of the invention has high radiance. The method of the invention can efficiently lower the burning temperature of the fluorescent powder and increase the relative brightness.

Description

technical field [0001] The invention relates to a fluorescent powder for white light LED and a preparation method thereof. The phosphor can be effectively excited by blue light, and can be combined with blue light chips to produce white light LEDs Background technique [0002] In recent years, with the global rise of the semiconductor lighting business of light-emitting diodes (LEDs), white LEDs have attracted great attention as a new generation of light sources. LED has many advantages: energy saving (20% of incandescent lamp with the same luminous brightness, 50% of fluorescent lamp), environmental protection (shock resistance, impact resistance, not easy to break, waste can be recycled), small size, all solid state, low calorific value (no heat radiation, Low power consumption), low voltage and low current start-up life (more than 1000 hours), fast response (can be operated at high frequency), and planar packaging can be easily developed into thin, light and compact prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86H01L33/00
CPCY02B20/181Y02B20/00
Inventor 李瑞段超李智强宁丽芹赵红娜
Owner XIANGLING LED
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