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Method for improving luminous intensity and thermal stability of nitride red fluorescent powder

A technology of red fluorescent powder and luminous intensity, which is applied in chemical instruments and methods, luminescent materials, energy-saving lighting, etc.

Active Publication Date: 2021-04-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is to provide a method that can greatly increase the luminous intensity while improving the thermal stability of the phosphor in view of the limitations and singleness of the current method for improving the luminous intensity and thermal stability of the phosphor

Method used

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  • Method for improving luminous intensity and thermal stability of nitride red fluorescent powder
  • Method for improving luminous intensity and thermal stability of nitride red fluorescent powder
  • Method for improving luminous intensity and thermal stability of nitride red fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Use Ca 3 N 2 , Si 3 N 4 , AlN, EuN as raw material powder. According to Ca 0.99 AlSiN 3 : 0.01Eu 2+ The ratio of each component of the chemical formula is to weigh the raw material, Ca 3 N 2 : 1.631 g, Si 3 N 4 : 1.247 grams, AlN: 1.366 grams, EuN: 0.055 grams. Then, put the raw materials into an agate mortar and grind them manually for more than 15 minutes to get a uniformly mixed powder, then put the powder in a graphite mold, and directly apply the top and bottom of the graphite mold under the vacuum condition of the cavity air pressure Increase the current to make the graphite mold rise from room temperature to 600°C in 3 minutes, then raise the temperature to 1400°C at a heating rate of 180°C / min, keep it warm for 5 minutes, and cool it to room temperature naturally. The obtained product is Ca without boron doping. 0.99 AlSiN 3 : 0.01Eu 2+ Phosphor.

Embodiment 2

[0038] Use Ca 3 N 2 , Si 3 N 4 , AlN, EuN, h-BN as raw material powders. According to Ca 0.99 al 1-x B x SiN 3 :0.01Eu 2+ , x = 0.025 The proportion of each component of the chemical formula weighs the raw material, Ca 3 N 2 : 1.631 g, Si 3 N 4 : 1.247 grams, AlN: 1.332 grams, EuN: 0.055 grams, BN: 0.0207 grams. Then, put the raw materials into an agate mortar and grind them manually for more than 15 minutes to obtain a uniformly mixed powder, then put the powder in a graphite mold, and directly apply the top and bottom of the graphite mold under the vacuum condition of the cavity pressure Increase the current to raise the temperature of the graphite mold from room temperature to 600°C in 3 minutes, then raise the temperature to 1410°C at a rate of 200°C / min, keep it warm for 4 minutes, and cool it down to room temperature naturally. The obtained product is boron-doped Ca 0.99 al 0.975 B 0.025 SiN 3 :0.01Eu 2+ Phosphor.

Embodiment 3

[0040] Use Ca 3 N 2 , Si 3 N 4 , AlN, EuN, h-BN as raw material powders. According to Ca 0.99 al 1-x B x SiN 3 :0.01Eu 2+ , x = 0.05 The proportion of each component of the chemical formula weighs the raw material, Ca 3 N 2 : 1.631 g, Si 3 N 4 : 1.247 grams, AlN: 1.298 grams, EuN: 0.055 grams, BN: 0.0413 grams. Then, put the raw materials into an agate mortar and grind them manually for more than 15 minutes to obtain a uniformly mixed powder, then put the powder in a graphite mold, and directly apply the top and bottom of the graphite mold under the vacuum condition of the cavity pressure Increase the current to raise the graphite mold temperature from room temperature to 600°C in 3 minutes, then raise the temperature to 1430°C at a heating rate of 200°C / min, keep it warm for 3 minutes, and cool it down to room temperature naturally. The obtained product is boron-doped Ca 0.99 al 0.95 B 0.05 SiN 3 :0.01Eu 2+ Phosphor.

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Abstract

The invention relates to a method for improving the luminous intensity and thermal stability of nitride red fluorescent powder, in particular to a method for improving luminous intensity and thermal stability of nitride red fluorescent powder CaAlSiN3: Eu < 2 + > by using hexagonal boron nitride (hBN) as a boron source dopant. The method comprises: on the basis of taking EuN, Ca3N2, AlN and Si3N4 as raw material powder, adding a certain proportion of h-BN ultrafine powder into a glove box, weighing, grinding, charging into a graphite mold and the like, putting the graphite mold filled with the mixed raw material powder into a plasma field sintering assisting device, sintering at 1400-1450 DEG C under the condition that the cavity pressure is less than 50Pa, controlling the reaction heating rate to be 180-200 DEG C / min and the heat preservation time to be 3-5 minutes, and after sintering, taking out a block and grinding the block to obtain the Ca0.99 (Al1-xBx) SiN3: 0.01 Eu < 2 + > boron-doped nitride red fluorescent powder with high luminous intensity and high thermal stability. The preparation method is simple in process and high in repeatability, the luminous intensity of the prepared product is improved by 30%-40% compared with that of boron-free powder, and the thermal stability is obviously improved.

Description

technical field [0001] The invention relates to the field of nitride phosphor powder, in particular to a method of improving CaAlSiN by boron doping 3 :Eu 2+ A method for luminous intensity and thermal stability, which uses hexagonal boron nitride (h-BN) as a boron source dopant to improve the nitride red phosphor CaAlSiN 3 : Eu 2+ luminous intensity and thermal stability. [0002] technical background [0003] Compared with traditional incandescent lamps, phosphor-converted white light-emitting diodes (pc-WLEDs) have unique and excellent properties such as energy saving, environmental protection, small size and long life, and are expected to become an indispensable solid-state light source for the next-generation lighting and display industries. The brightness, color rendering index and stability of white LEDs can generally depend largely on the quality of phosphors. At present, the most mature white light technology is the blue LED chip developed by Japanese companies c...

Claims

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Application Information

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IPC IPC(8): C09K11/80H01L33/50
CPCY02B20/00
Inventor 沈强鲁翔宇袁海龙黄志锋陈斐李美娟张联盟
Owner WUHAN UNIV OF TECH
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