Blue fluorescent powder and preparation method thereof

A blue phosphor and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low color rendering index of phosphor encapsulation, unfavorable industrial production, poor moisture and heat resistance, etc., so as to improve the luminous performance, Avoid heavy workload and improve uniformity

Pending Publication Date: 2021-04-30
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a blue fluorescent powder and its preparation method to solve the problems of low color rendering index, low color purity, poor luminous intensity, and poor resistance to heat and humidity in existing fluorescent powder packaging. The production process solves the problems in the current production process that are not conducive to industrial production, such as complex processes and high requirements for equipment

Method used

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  • Blue fluorescent powder and preparation method thereof
  • Blue fluorescent powder and preparation method thereof
  • Blue fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the chemical formula is Ba 0.99 Eu 0.01 Al 0.01 Si 2 o 2 N 2.01 The molar ratio of each element in the glove box was weighed Ba 3 N 2 (purity greater than 99.5%) 57.14g, SiO 2 (purity greater than 99.5%) 23.64g, Si 3 N 4 (purity greater than 99.5%) 18.40g, EuN (purity greater than 99.5%) 0.65g, AlN 0.16g and NH 4 Cl (purity greater than 99.5%) 1 g. Weigh 0.5g NaCl as a flux, put it into a ball mill jar, add alcohol, mix in a ball mill for 120 minutes, then pass the mixed raw materials through a 300-mesh nylon sieve through an ultrasonic vibrator, and pass the sieved raw materials through a spray granulator to produce 8μm balls, then put the raw material granulation balls into the molybdenum crucible, and quickly advance them into the atmosphere-protected rotary kiln with a heat preservation zone of 1300°C, where the protective atmosphere is H 2 content is 80% H 2 -N 2 Mixed gas, keep warm for 150 minutes, then quickly push out the furnace body,...

Embodiment 2-9

[0040] According to the synthetic chemical formula is Ba 0.99 Eu 0.01 Al 0.01 Si 2 o 2 N 2.01 , change the parameters in the preparation process (see Table 1 for details), and other operations are carried out according to the method of Example 1, and the obtained phosphor is characterized, and the results are shown in Table 1.

[0041] Table 1:

[0042]

[0043] It can be seen from Table 1 that after adopting the ultrasonic sieving and spray granulation process, the particle distribution of the product is obviously more concentrated, the brightness is higher, and the luminescence is more uniform. With the increase of the holding time, the product brightness first increases and then As the temperature in the high temperature zone increases, the brightness of the product also increases first and then decreases. The size of the spherical particles of the raw material granulation also affects the size of the product particles.

Embodiment 10

[0045] According to the chemical formula is Ba 0.98 Eu 0.02 Al 0.01 Si 2 o 2 N 2.01 The molar ratio of each element in the glove box was weighed Ba 3 N 2 Mass 56.65g, SiO 2 Mass 23.68g, Si 3 N 4 Mass 18.43g, AlN mass 0.41g, EuN mass 1.3g. Weigh MgCl 2 As a flux, the mass accounts for 2% of the total mass of raw materials, put into a ball mill tank and add alcohol, mix in a ball mill for 180 minutes, then pass the mixed raw materials through a 300-mesh nylon sieve through an ultrasonic vibrator, and pass the sieved raw materials through The spray granulation machine makes 10μm balls, and then puts the raw material granulation balls into the molybdenum crucible, and quickly pushes them into the atmosphere-protected rotary kiln with a heat preservation zone of 1450°C, where the protective atmosphere is H 2 content is 80% H 2 -N 2 Mixed gas, keep warm for 150 minutes, then quickly push out the furnace body, take out the material in the molybdenum crucible and simply p...

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Abstract

The invention relates to blue fluorescent powder and a preparation method thereof, wherein the chemical general formula of the fluorescent powder is A1-xEuxBySi2O2N2+y, A is any one or two of Sr, Ca and Ba, B is any one or two of Al, Ga, In, Y and La, x is greater than or equal to 0.01 and less than 0.1, and y is greater than 0 and less than 0.1. The invention further discloses a preparation method of the fluorescent powder. According to the invention, a small amount of Al, Ga, In, Y and La elements are added into BaSi2O2N2 structure fluorescent powder, so that the wavelength of the fluorescent powder can be adjusted, the stability of a crystal structure and the nucleation consistency are improved, the brightness of the fluorescent powder is improved, and the damp-heat resistance of the fluorescent powder is improved; and according to the preparation method, a specific raw material treatment process and a sintering mode are applied, so that the uniformity and controllability of product particles are improved, meanwhile, the requirements on using equipment are reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder preparation, in particular to a blue fluorescent powder and a preparation method thereof. Background technique [0002] As the fourth-generation lighting source after tungsten lamps, fluorescent lamps and energy-saving lamps, LED not only has high luminous efficiency, long life, and low energy consumption, but also has many advantages such as safety, multi-color, low driving voltage, and anti-vibration. At present, the more mature technology is to use the combination of InGaN blue chip and YAG:Ce yellow phosphor to form white LED. However, in actual use, YAG:Ce yellow phosphor has shortcomings such as low color rendering index and insufficient red light components in the spectrum due to its own nature, which makes it difficult to achieve a white LED device with a higher color rendering index, and it is also difficult Achieve warm white light. With people's continuous demands on light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7734
Inventor 杨志平刘学千李璇璇赵金鑫王大伟蒋丽涛尤泳
Owner HEBEI LIFU CHEM TECH
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