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LED nitride fluorescent powder and preparation method thereof

A nitride phosphor and chemical structural formula technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of complex process, high cost, and harshness, and achieve the effect of low color temperature, low cost, and easy operation

Active Publication Date: 2010-08-18
JIANGSU BREE OPTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the preparation method of nitride phosphors in China has relatively strict requirements on equipment. The pressure required for the preparation method reported in the literature is between 50-200 MPa, which not only puts forward high requirements for the synthesis equipment, but also has a high cost. High, complex process and other issues

Method used

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  • LED nitride fluorescent powder and preparation method thereof
  • LED nitride fluorescent powder and preparation method thereof
  • LED nitride fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh Ca 3 N 2 6.771g, Si 3 N 4 6.407g, AlN5.617g, Eu 2 o 3 1.206g, mix the above raw materials in a glove box, put them into a molybdenum crucible, then quickly move them into a tube furnace, then gradually heat up to 1500°C under the protection of a nitrogen-hydrogen mixed atmosphere, and keep warm for 5-7 hours , after cooling down, grind and sieve, then raise the temperature to 1750°C under the protection of a nitrogen-hydrogen mixed atmosphere, keep warm for 8-10h, after grinding and sieving, wash with 10% nitric acid, and finally wash with deionized water, Drying can produce Ca 0.95 AlSiN 3 : 0.05Eu nitride phosphor. Its excitation spectrum see figure 1 , the monitoring wavelength is 660nm, from figure 1 It can be seen from the above that the excitation peak of the excitation spectrum is relatively broad, and the excitation effects in the violet, ultraviolet and blue light ranges are very good. Its emission spectrum see figure 2 , the excitation wavele...

Embodiment 2

[0038] Weigh Ca 3 N 2 6.602g, Si 3 N 4 6.247g, AlN5.477g, Eu 2 o 3 1.175g, Dy 2 o 3 0.498g, mix the above raw materials well in a glove box, put them into a molybdenum crucible, then quickly move them into a tube furnace, then gradually raise the temperature to 1500°C under the protection of a nitrogen-hydrogen mixed atmosphere, and keep it warm for 5-7 hours , after cooling down, grind and sieve, then raise the temperature to 1750°C under the protection of nitrogen-hydrogen mixed atmosphere, keep warm for 8-10h, after grinding and sieving, wash with 5% hydrochloric acid, and finally wash with deionized water, Drying can produce Ca 0.93 AlSiN 3 : 0.05Eu, 0.02Dy nitride phosphor. The emission main peak and luminous intensity are shown in Table 1, both of which are higher than those of Comparative Example 1.

Embodiment 3

[0040] Weigh Ca 3 N 2 6.445,Si 3 N 4 6.099g, AlN5.079g, GaN0.546g, Eu 2 o 3 1.148g, Sm 2 o 3 0.682g, the above raw materials are fully mixed in a glove box, put into a molybdenum crucible, and then quickly moved into a tube furnace, and then gradually heated up to 1500°C under the protection of high-purity nitrogen, and kept for 5-7 hours. After cooling down, grind and sieve, then raise the temperature to 1750°C under the protection of high-purity nitrogen, keep warm for 8-10h, after grinding and sieving, wash with 8% phosphoric acid, and finally wash with deionized water and dry , to produce Ca 0.92 al 0.95 Ga 0.05 SiN 3 : 0.05Eu, 0.03Sm nitride phosphor. The emission main peak and luminous intensity are shown in Table 1, both of which are higher than those of Comparative Example 1.

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Abstract

The invention discloses LED nitride fluorescent powder and a preparation method thereof. The chemical structural formula of the LED nitride fluorescent powder is LaXbZcNd: rR, wherein L is at least one of Ca, Sr and Ba; X is at least one of B, Al, Ga, In and Tl, wherein Al is necessary; Z is at least one of C, Si and Ge, wherein Si is necessary; R is at least one of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, wherein Eu is necessary; and (a + r): b: c: d is equal to 1: 1: 1: 3. The preparation method is as follows: weighing raw materials according to the composition of the chemical formula of the fluorescent powder and the stoichiometric ratio, adding an activator, uniformly mixing in a glove box, sealing, then adopting the normal-pressure high-temperature solid-state method for carrying out multiple roasting under the protection atmosphere, and carrying out post-treatment for obtaining the LED nitride fluorescent powder. The luminescent material is characterized by good chemical stability, high luminescence efficiency and the like, and the manufacturing method is simple, pollution-free and low in cost.

Description

technical field [0001] The invention relates to an LED nitride phosphor that can be effectively excited by ultraviolet, violet or blue light and a preparation method thereof. Background technique [0002] In recent years, with the gradual improvement of light-emitting diode (LED) luminous efficiency and the gradual decline of cost, semiconductor lighting has gradually become the development trend of modern lighting. Light source, known as "21st century green light source". [0003] In order to realize the entry of semiconductor lighting into the field of general lighting, efficient white LEDs must be obtained. At present, there are many ways to realize white light LED, the most important one is to coat yellow phosphor (YAG) on the LED chip to realize white light emission. However, this method has the disadvantages of high coloring temperature and low color rendering index, and cannot meet the requirements of semiconductor lighting. At present, the domestic research on YAG...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/64H01L33/50
Inventor 何锦华藤晓明梁超
Owner JIANGSU BREE OPTRONICS CO LTD
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