Hydrophobic modified fluorescent powder, and preparation method and application thereof

A hydrophobic modification, phosphor technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of affecting the service life, luminescence attenuation of fluorescent materials, affecting the luminescence of fluorescent materials, etc., to achieve good long-term stability, Good long-term stability and service life, and the effect of improving hydrophobicity

Inactive Publication Date: 2018-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most inorganic films (for example, pyrophosphate, silicate, and aluminate) are hydrophilic materials, and the formation of such inorganic films on the surface of fluorescent materials will make the materials more likely to absorb water molecules, and thus more susceptible to water. The erosion of the fluorescent material attenuates the luminescence of the fluorescent material, thereby affecting its service life
Too thick inorganic layer will affect the intrinsic luminescence of fluorescent materials

Method used

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  • Hydrophobic modified fluorescent powder, and preparation method and application thereof
  • Hydrophobic modified fluorescent powder, and preparation method and application thereof
  • Hydrophobic modified fluorescent powder, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This example provides a hydrophobically modified Ba 2 SiO 4 :Eu 2+ Green fluorescent powder, which is prepared by the following steps:

[0065] Weigh 1g Ba 2 SiO 4 :Eu 2+ For green fluorescent powder, place the fluorescent powder in ammonia solution for 10 minutes, then wash and dry;

[0066] Ba after ammonia treatment 2 SiO 4 :Eu 2+ Green fluorescent powder was added to 25mL of n-heptane to form a mixed solution, and 5mL of methyldichlorosilane and 5ml of dimethyldichlorosilane were added to the above mixed solution, stirred for 30 minutes, and the n-heptane was completely volatilized to obtain a mixture sample;

[0067] Put the mixture sample in a horizontal tube furnace with ammonia gas for 5 minutes, then pyrolyze it at 500°C for 2 hours, then cool it to obtain a mixture of residual liquid polysiloxane, filter the mixture, and dry it. Hydrophobically modified Ba 2 SiO 4 :Eu 2+ Green phosphor.

[0068] Ba before and after the hydrophobic modification of th...

Embodiment 2

[0073] This example provides a hydrophobically modified Ca 2 Si 5 N 8 :Eu 2+ Red fluorescent powder, it is prepared by the following steps:

[0074] Weigh 1g Ca 2 Si 5 N 8 :Eu 2+ For red fluorescent powder, place the fluorescent powder in aqueous oxalic acid solution for 15 minutes, then wash and dry;

[0075] Ca after treatment with oxalic acid aqueous solution 2 Si 5 N 8 :Eu 2+ Add red fluorescent powder to 15mL cyclohexane to form a mixed solution, add 5mL methyldichlorosilane to the above mixed solution, stir for 30 minutes, the cyclohexane is completely volatilized, and a mixture sample is obtained;

[0076] Put the mixture sample in a horizontal tube furnace with ammonia gas for 5 minutes, then pyrolyze it at 500°C for 2 hours, then cool it to obtain a mixture of residual liquid polysiloxane, filter the mixture, and dry it. Hydrophobically modified Ca 2 Si 5 N 8 :Eu 2+ red phosphor.

[0077] The Ca after hydrophobic modification of this embodiment 2 Si ...

Embodiment 3

[0082] This example provides a hydrophobically modified Ba 2 Si 5 N 8 :Eu 2+ Red fluorescent powder, it is prepared by the following steps:

[0083] Weigh 1g Ba 2 Si 5 N 8 :Eu 2+ Red fluorescent powder, placed in ammonia solution for 15 minutes, then washed and dried;

[0084] Ba after ammonia treatment 2 Si 5 N 8 :Eu 2+ Add red fluorescent powder to 25mL benzene to form a mixed solution, add 3mL methyldichlorosilane and 3ml dimethyldichlorosilane to the above mixed solution, stir for 30 minutes, the benzene is completely volatilized, and a mixture sample is obtained;

[0085] Put the mixture sample in a horizontal tube furnace with ammonia gas for 5 minutes, then pyrolyze it at 400°C for 2 hours, then cool it to obtain a mixture of residual liquid polysiloxane, filter the mixture, and dry it. Hydrophobically modified Ba 2 Si 5 N 8 :Eu 2+ red phosphor.

[0086] Ba after hydrophobic modification of the present embodiment 2 Si 5 N 8 :Eu 2+ X-ray diffraction ...

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Abstract

The invention provides a hydrophobic modified fluorescent powder, and a preparation method and application thereof. The preparation method of the hydrophobic modified fluorescent powder includes the following steps of: step 1: placing a fluorescent powder in an acidic solution or an alkaline solution to perform surface treatment, so as to obtain a surface-treated fluorescent powder; step 2: mixingthe surface-treated fluorescent powder with chlorosilane and an organic solvent, and performing stirring until the organic solvent is completely volatilized, so as to obtain a mixture; and step 3: putting the mixture in an ammonia gas for pyrolysis treatment, so as to obtain the hydrophobic modified fluorescent powder. The hydrophobic modified fluorescent powder forms a coating layer with a suitable thickness on the surface of a silicon-based (oxy)nitride compound fluorescent powder, and can improve the stability and hydrophobicity of the silicon-based (oxy)nitride compound fluorescent powderin a high-temperature and high-humidity environment.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a hydrophobically modified fluorescent powder and its preparation method and application. Background technique [0002] LED solid-state lighting has been widely used due to its high luminous efficiency, low energy consumption, long life, and high reliability. Phosphor powder is one of the necessary conditions for solid-state lighting. Generally, blue light chips are down-converted to green, yellow and red bands through phosphor powder. Phosphors used in solid-state lighting must have the advantages of suitable luminous wavelength band, high quantum efficiency, low thermal quenching and high reliability. [0003] However, during the use of phosphor powder, the problem often encountered is the problem of light attenuation caused by high temperature and high humidity, which further affects the service life of phosphor powder. For example, the well-known t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/59C09K11/79C09K11/64H01L33/50E21B47/11
CPCC09K11/025C09K11/0883C09K11/7728C09K11/7734C09K11/7774E21B47/11H01L33/502
Inventor 郑德温卢德唐董大忠徐鑫陈建军咸玉席田伟刘德勋孙自昱张晓伟贾晓天于荣泽杜鑫
Owner PETROCHINA CO LTD
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