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

A technology of red fluorescent and fluorescent powder, which is applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps. It can solve the problems of insufficient stability and easy decomposition, and achieve the effect of easy operation, simple steps and conditions

Active Publication Date: 2010-06-30
昆山艺全夜光材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Previously, red phosphors were generally made by adding rare earth activators to sulfides, such as Y 2 o 2 S:Eu, CaS:Eu, etc., the biggest defect of this type of phosphor is that it is not stable enough, and it is easy to decompose under the conditions of heating or ultraviolet irradiation

Method used

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

Examples

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Effect test

example 1

[0025] Accurately weigh raw material Sr 3 N 2 36.26g, Si 3 N 4 46.75g, Li 3 N 0.12g, YF 3 1.46g, Eu 2 o 3 1.06g, pre-mix the above raw materials, then add YF 3 1.46g is used as a flux, put into a ball milling tank for ball milling and mixing, the ball milling time is 2-5h, the ball milling tank is sealed, and filled with nitrogen as a protective gas. After completion, put the uniformly mixed materials into an alumina crucible and put them in a tubular resistance furnace for calcination, keep warm at 1580°C for 4 hours, the heating rate is about 5°C / min, and naturally cool to room temperature after the heat preservation, the whole calcination process is complete Access to NH 3 gas as a protective and nitriding gas. After cooling, take out the bulk powder, mechanically crush it, and then ball mill until the average particle size reaches 6.0±0.5um, and pass through 0.1mol / L HNO 3 Pickling, soaking in 80□C hot water to remove impurities, and then centrifugal drying ...

example 2

[0027] Accurately weigh raw material Sr 3 N 2 35.87g, Si 3 N 4 46.75g, Li 3 N 0.12g, YF 3 1.46g, Eu2 o 3 1.76g, pre-mix the above raw materials, then add YF 3 1.46g is used as a flux, put into a ball milling tank for ball milling and mixing, the ball milling time is 2-5h, the ball milling tank is sealed, and filled with nitrogen as a protective gas. After completion, put the uniformly mixed materials into an alumina crucible and put them in a tubular resistance furnace for calcination, keep warm at 1580°C for 4 hours, the heating rate is about 5°C / min, and naturally cool to room temperature after the heat preservation, the whole calcination process is complete Access to NH 3 gas as a protective and nitriding gas. After cooling, take out the bulk powder, mechanically crush it, and then ball mill until the average particle size reaches 6.0±0.5um, and pass through 0.1mol / L HNO 3 Pickling, soaking in 80□ hot water to remove impurities, and then centrifugal drying to ...

example 3

[0029] Accurately weigh raw material Sr 3 N 2 36.26g, Si 3 N 4 45.82g, AlN 0.82g, Li 3 N 0.12g, YF 3 1.46g, Eu 2 o 3 1.06g, pre-mix the above raw materials, then add YF 3 1.46g is used as a flux, put into a ball milling tank for ball milling and mixing, the ball milling time is 2-5h, the ball milling tank is sealed, and filled with nitrogen as a protective gas. After completion, put the uniformly mixed materials into an alumina crucible and put them in a tubular resistance furnace for calcination, keep warm at 1580°C for 4 hours, the heating rate is about 5°C / min, and naturally cool to room temperature after the heat preservation, the whole calcination process is complete Access to NH 3 gas as a protective and nitriding gas. After cooling, take out the bulk powder, mechanically crush it, and then ball mill until the average particle size reaches 6.0±0.5um, and pass through 0.1mol / L HNO 3 Pickling, soaking in 80□C hot water to remove impurities, and then centrifu...

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Abstract

The invention relates to a red fluorescent powder used by a white light LED and a preparation method thereof. The chemical composition formula of the fluorescent powder is A2-x-2mYmLimSi5-nAlnN8-pFp: XEu, wherein A is one or more of Ca, Ma, Sr and Ba; x is more than or equal to 0.01 but less than or equal to 0.1; m is more than or equal to 0.001 but less than or equal to 1; and p is more than or equal to 0 but less than or equal to n / 2+3m. When metals are used as the raw materials, the nitrogen treatment is required. The preparation method thereof comprises the steps of: accurately weighting various nitride raw materials according to the chemometry, adding a given mass of fluxing agent, ball-milling the mixture for 2 hours, combining at high temperature by using a tubular resistor furnace, burning for 2 to 5 hours at 500 to 1650 DEG C, taking out after naturally cooling to lower than 100 DEG C, and then processing by using a grinding screen so as to acquire the finished product of the fluorescent powder. In the whole process, the ammonia is blown into and is used as the protecting, reducing and nitriding gas. The fluorescent powder can be efficiently aroused by the blue light and can emit the red light which has a peak value close to 620 nm.

Description

technical field [0001] The invention relates to a red fluorescent powder for white light LED and a preparation method thereof. The fluorescent powder can be effectively excited by blue light to emit red light with a peak at around 620nm, and can be used in conjunction with green fluorescent powder to produce white LEDs with low color temperature and high color rendering index based on blue light chips. 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. Compared with traditional lighting sources, LED chips emit light based on the recombination of carriers in semiconductors, and the spectrum is almost entirely concentrated in a specific visible light frequency, and various colors of light can be obtained directly without adding filters, which greatly improves the utilization rate of electric energy. LED has m...

Claims

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Application Information

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IPC IPC(8): C09K11/79C09K11/80H01L33/00
CPCY02B20/181Y02B20/00
Inventor 李瑞段超李智强宁丽芹赵红娜
Owner 昆山艺全夜光材料科技有限公司
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