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Red fluorescent powder for light-emitting diodes and preparation method thereof

A technology of red phosphor powder and light emitting diode, applied in the field of LED light source, can solve the problems of unsuitable general lighting field, high color temperature, elegant color coordinates, etc., and achieve the effects of improving lighting and display quality, improving color rendering, and reducing cost

Inactive Publication Date: 2012-03-28
上海穗杉实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method of realizing white light LEDs is that because yttrium aluminum garnet can only emit yellow light and lacks red components, the resulting white light has low color rendering, high color temperature, and poor light quality, which is not suitable for general use. lighting field
At the same time, the wavelength of the yttrium aluminum garnet phosphor has a small change, and the color is not rich, which cannot meet many other LED lighting applications.
At present, the red powder used in white LEDs is a rare earth-activated sulfide, such as SrS:Eu. However, this type of compound is extremely unstable, easy to decompose, and has a short life
Causes color coordinates to flutter and LED chips to fail due to S corrosion

Method used

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  • Red fluorescent powder for light-emitting diodes and preparation method thereof
  • Red fluorescent powder for light-emitting diodes and preparation method thereof
  • Red fluorescent powder for light-emitting diodes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] To prepare a red phosphor for LED: weigh 0.323 mol of Ca 3 N 2 , 0.02 mole of EuN, 0.83 mole of Si 3 N 4 , 0.01 mole of NH 4 F. Mix well. The reaction was performed for 10 hours at 1600 degrees Celsius at 20 atmospheres in nitrogen. Cool to room temperature, crush, grind, go through a 200 mesh screen, wash, and dry at 120 degrees Celsius for 10 hours. The red phosphor for this kind of light-emitting diode is obtained, and its emission spectrum is as follows figure 1 Shown.

Embodiment 2

[0015] Prepare a red phosphor for LED: weigh 0.323 mole of Sr 3 N 2 , 0.02 mole of EuN, 0.83 mole of Si 3 N 4 , 0.01 mole of NH 4 F. Mix well. The reaction was carried out for 10 hours at 1350 degrees Celsius at 20 atmospheres in nitrogen. Cool to room temperature, crush, grind, go through a 200 mesh screen, wash, and dry at 120 degrees Celsius for 10 hours. The red phosphor for this kind of light-emitting diode is obtained, and its emission spectrum is as follows figure 1 Shown.

Embodiment 3

[0017] To prepare a red phosphor for LED: weigh 0.2 mole of Ca 3 N 2 , 0.13 mole of Sr 3 N 2 , 0.02 mole of EuN, 0.83 mole of Si 3 N 4 , 0.01 mole of NH 4 Cl. Mix well. The reaction was carried out for 8 hours at 1700°C under 10 atmospheres in nitrogen. Cool to room temperature, crush, grind, go through a 200 mesh screen, wash, and dry at 120 degrees Celsius for 10 hours. The red phosphor for this kind of light-emitting diode is obtained, and its emission spectrum is similar figure 1 Shown.

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Abstract

The invention belongs to the technical field of LED (light-emitting diode) light sources, and particularly relates to a red fluorescent powder for light-emitting diodes and a preparation method thereof. The chemical formula of the red fluorescent powder is (Al-xEux)2B5C8, wherein A is alkaline earth, B is one or more of boron, Si, Al, Ga, In, Ta and Ge elements, C is N and O elements, and x is greater than or equal to 0.0001 and smaller than or equal to 1. The preparation of the red fluorescent powder adopts a high-temperature, high-pressure solid-phase synthesis method, the nitride of each element in the structure or other materials capable of producing the nitrides are chosen as original reactants, boric acid, alkaline earth halide or ammonium salt is used as cosolvent, the original reactants and the cosolvent are burnt under the temperature of 1350 DEG C to 2000 DEG C and the atmospheric pressure of 0 to 200 in the reducing atmosphere or nitrogen for 2 to 10 hours, and after cooling and crushing, the fluorescent powder which is 4 to 20 microns is obtained. The fluorescent powder is chemically stable, moreover, the emission peak can be shifted within a range between 600 nanometers and 690 nanometers, and the red fluorescent powder is stimulated by blue and ultraviolet LEDs. The fluorescent powder is applied on LED chips, color temperature, color coordinates, brightness and other optical parameters are regulated, and thereby various backlight devices can be produced.

Description

technical field [0001] The invention belongs to the technical field of LED light sources, and in particular relates to a fluorescent powder emitting red light and a preparation method thereof. Background technique [0002] LED lighting is considered to be a new generation of lighting sources in the 21st century. It is a semiconductor device that converts electrical energy into light energy. It has the advantages of high light efficiency, energy saving, long life, low starting voltage, shock resistance, environmental protection, etc. It has been highly valued by various countries and has gradually entered the practical stage. At present, white light LED lighting is mainly achieved by adding phosphors to LEDs, and the technology is relatively mature. A typical approach is to use a blue LED and YAG phosphor Y which can be excited by the blue light of the LED and emit yellow light. 3 al 5 o 12 :Ce combined. This method has high efficiency and good chemical stability, and i...

Claims

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Application Information

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IPC IPC(8): C09K11/79H01L33/50
CPCY02B20/181Y02B20/00
Inventor 曾菲贾吉来赵宏炜丁艳宾张敏周庆庆祖利娟
Owner 上海穗杉实业股份有限公司
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