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Production method for surface-treated phosphor, surface-treated phosphor, wavelength conversion member, and light emitting device

A technology of surface treatment and manufacturing method, which is applied in the field of surface treatment phosphors, can solve problems such as deterioration and luminous efficiency drop, and achieve high long-term reliability and high initial luminous efficiency

Inactive Publication Date: 2017-02-22
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

Deterioration of alkaline earth phosphors due to the formation of hydroxides, leading to a decrease in luminous efficiency

Method used

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  • Production method for surface-treated phosphor, surface-treated phosphor, wavelength conversion member, and light emitting device
  • Production method for surface-treated phosphor, surface-treated phosphor, wavelength conversion member, and light emitting device
  • Production method for surface-treated phosphor, surface-treated phosphor, wavelength conversion member, and light emitting device

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Embodiment Construction

[0015] Before describing the embodiments of the present invention, problems in the method for producing the related surface-treated phosphor will be described.

[0016] When forming the surface treatment layer by the method of Patent Document 1, the alkaline earth silicate phosphor is brought into contact with the surface treatment aqueous solution. Therefore, before the surface treatment layer is formed, the surface of the alkaline earth silicate phosphor reacts with water to form a hydroxide. Therefore, in the surface-treated phosphor obtained by the production method of Patent Document 1, the initial luminous efficiency decreases.

[0017] In addition, in the method of Patent Document 1, even if the surface treatment layer is formed, water derived from the surface treatment aqueous solution remains between the surface of the alkaline earth silicate phosphor and the surface treatment layer. Therefore, the remaining water gradually degrades the surface of the alkaline earth ...

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Abstract

A method for producing a surface-treated phosphor covered with a surface-treatment layer for coating the surface of an alkaline earth silicate phosphor containing an alkaline earth metal silicate. The method for producing a surface-treated phosphor includes a surface treatment for forming a surface-treatment layer on the surface of an alkaline earth silicate phosphor by bringing the alkaline earth silicate phosphor and at least one type of surface-treatment substance selected from the group consisting of sulfates, phosphates, carbonates, borate salts, boric acid, titanates, and fluorides into contact in the presence of at least one type of polyhydric alcohol selected from the group consisting of diols and triols.

Description

technical field [0001] The present invention relates to a method for producing a surface-treated phosphor obtained by coating the surface of an alkaline-earth silicate phosphor with a surface-treated layer, the surface-treated phosphor obtained by the method, and a wavelength conversion member and light-emitting device using the same. Background technique [0002] For example (Sr,Ba,Ca) 2 SO 4 :Eu 2+ Alkaline-earth silicate phosphors are attracting attention as phosphors for white LEDs because they can easily obtain light of various emission wavelengths by adjusting the composition and have high luminous efficiency. [0003] However, the general alkaline earth silicate phosphor has poor moisture resistance. Specifically, in the presence of water or moisture in the air, hydroxides are formed on the surface of the alkaline earth silicate phosphor due to the reaction of the alkaline earth metal and water. The alkaline-earth phosphor is degraded by formation of hydroxide, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/08C09K11/59H01L33/50
CPCH01L33/50H01L2224/48091C09K11/025C09K11/59C09K11/77342H01L2924/00014B01J13/04H01L33/502H01L33/507H01L33/56
Inventor 柴本真治大盐祥三山崎圭一宫崎惠美文菂
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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