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Nitride fluorescent powder and preparation method thereof

A nitride phosphor, nitrogen technology, applied in the field of phosphors, can solve problems such as the inability to fully meet the needs of the application, and achieve the effects of improving luminous performance, simple process control, and easy operation

Active Publication Date: 2013-02-13
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application of high color rendering, not only the color rendering index has certain requirements, but also the light effect must reach a certain level, but at present, whether it is M 2 Si 5 N 8 :Eu 2+ (M=Ca, Sr, Ba) or CaAlSiN 3 :Eu 2+ , the light effect can not fully meet the needs of the application

Method used

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  • Nitride fluorescent powder and preparation method thereof
  • Nitride fluorescent powder and preparation method thereof
  • Nitride fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh Ca 3 N 2 1.056g, Sr 3 N 2 8.732g, Si 3 N 4 5.001g, P 2 o 5 0.4g, AlN 4.614g, Eu 2 o 3 0.198g, the above raw materials are packed in the mixing tank in the glove box protected by argon, then mixed on the mixer for 3 hours, after mixing evenly, put into the molybdenum crucible, then move it into the tube furnace rapidly, then Under the protection of pure nitrogen atmosphere, the temperature is gradually raised to 1700°C, and the temperature is kept for 15 hours to prepare Ca 0.19 Sr 0.8 AlSi 0.95 P 0.05 N 2.926 : 0.01Eu nitride phosphor. Its excitation spectrum is shown in figure 1 , the emission spectrum see figure 2 , XRD pattern see image 3 , and its luminous intensity is shown in Table 1, which is higher than Comparative Examples 1 and 2.

Embodiment 2

[0030] Weigh Ca 3 N 2 1.016g, Sr 3 N 2 8.759g, Si 3 N 4 5.016g, P 2 o 5 0.401g, AlN 4.165g, BN 0.28g, Eu 2 o 3 0.199g, Gd 2 o 3 0.164g, the above raw materials are packed in the mixing tank in the glove box protected by argon, then mixed on the mixer for 3 hours, after mixing evenly, put into the molybdenum crucible, then move it into the tube furnace rapidly, then Under the protection of pure nitrogen, the temperature is gradually raised to 1700 ° C, and the temperature is kept for 15 hours to prepare Ca 0.182 Sr 0.8 Al 0.9 B 0.1 Si 0.95 P 0.05 N 2.922 : 0.01Eu, 0.008Gd nitride phosphor. The emission main peak and luminous intensity are shown in Table 1, and the luminous intensity is higher than that of Comparative Examples 1 and 2.

Embodiment 3

[0032] Weigh Ca 3 N 2 0.993g, Sr 3 N 2 8.662g, Si 3 N 4 4.96g, P 2 o 5 0.396g, AlN 4.576g, Eu 2 o 3 0.196g, Tm 2 o 3 0.215g, the above raw materials are packed in the mixing tank in the glove box protected by argon, then mixed on the mixer for 3 hours, after mixing evenly, put into the molybdenum crucible, then move it into the tube furnace rapidly, then Under the protection of pure nitrogen, the temperature is gradually raised to 1700 ° C, and the temperature is kept for 15 hours to prepare Ca 0.18 Sr 0.8 AlSi 0.95 P 0.05 N 2.92 : 0.01Eu, 0.01Tm nitride phosphor. The emission main peak and luminous intensity are shown in Table 1, and the luminous intensity is higher than that of Comparative Examples 1 and 2.

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Abstract

The invention relates to nitride fluorescent powder. The nitride fluorescent powder has a chemical structural formula of Ca1-r-tSrtASi1-aPaNb: rR, wherein in the chemical structural formula, a is greater than 0 and less than or equal to 0.1; b is greater than or equal to 2.5 and less than or equal to 3.5; r is greater than or equal to 0.001 and less than or equal to 0.1; t is greater than or equal to 0.6 and less than or equal to 0.9; A represents at least one of B, Al and Ga; R represents at least one of Ce, Eu, Gd, Ho, Er, Tm, Yb and Lu; and Eu is necessary. The invention also relates to a preparation method of the nitride fluorescent powder. The preparation method utilizes Sr to replace Ca so that a crystalline field environment is changed; a main emission peak of the nitride fluorescent powder can be adjusted; and fluorescent powder luminescent intensity is greatly improved. The preparation method adopts P so that fluorescent powder luminescent intensity is improved.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a nitride fluorescent powder which can be effectively excited by ultraviolet light, purple light or blue light and a preparation method thereof. Background technique [0002] At present, the main way to realize white LED is to coat yellow YAG phosphor on the LED chip, but this method has disadvantages such as high coloring temperature and low color rendering index. Since the emission intensity of the red light region of the YAG phosphor itself is very weak, it cannot solve the existing problems at present, and the addition of red phosphor can realize white light with low color temperature and high CRI. [0003] Currently widely used red phosphors are mainly sulfide or oxide systems, which cannot meet the needs of white LED technology development due to defects such as poor chemical stability, low luminous efficiency, and narrow excitation range. In this context, nitride system phosphors a...

Claims

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Application Information

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IPC IPC(8): C09K11/71
Inventor 何锦华滕晓明梁超符义兵
Owner JIANGSU BREE OPTRONICS CO LTD
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