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Method for treating surface of phosphor, phosphor, light-emitting device, and illumination device

A technology of surface treatment and phosphor, applied to the surface coating liquid device, after treatment, luminescent material, etc., can solve problems such as degradation, and achieve the effect of improving the reliability of moisture resistance

Inactive Publication Date: 2015-02-11
DENKA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Nitride phosphors containing Sr are easily degraded by oxygen, heat, moisture, etc., and there is a problem of moisture resistance reliability in particular

Method used

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  • Method for treating surface of phosphor, phosphor, light-emitting device, and illumination device
  • Method for treating surface of phosphor, phosphor, light-emitting device, and illumination device

Examples

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Embodiment

[0041] Examples and comparative examples of the present invention are listed below, and the effects of the present invention will be described with reference to Table 1. FIG.

[0042] The phosphors of the surface treatment methods of the phosphors of Examples and Comparative Examples are host crystals with (Sr, Ca)AlSiN 3 Phosphors with substantially the same crystal structure were produced by the following production method, and are Reference Example 1 in Table 1.

[0043] [Manufacturing method of phosphor]

[0044]As for the raw material of the phosphor, 52.2 mass % of α-type silicon nitride powder (SN-E10 grade manufactured by Ube Industries, Ltd.), 45.8 mass % of aluminum nitride powder (E grade manufactured by Tokuyama Corporation), 2.0 Mass % europium oxide (RU grade manufactured by Shin-Etsu Chemical Co., Ltd.). These raw materials were mixed with a ball mill to produce a mixed raw material. For ball mill mixing, a nylon tank and silicon nitride balls were used, and ...

Embodiment 2

[0058] In the surface treatment method of the phosphor in Example 2, except that the temperature of the heat treatment step was set to 300° C., using the same method and conditions as in Example 1, the above-mentioned host crystal had the same (Sr, Ca)AlSiN 3 Phosphors having substantially the same crystal structure as the crystals are surface-treated.

Embodiment 3

[0060] In the method for treating the surface of the phosphor in Example 3, except that the amount of triammonium phosphate trihydrate added to the phosphor was 0.70% by mass (the phosphorus content relative to the phosphor was 0.11% by mass), Using the same method and conditions as in Example 1, the above-mentioned host crystal has the same properties as (Sr, Ca)AlSiN 3 Phosphors having substantially the same crystal structure as the crystals are surface-treated.

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Abstract

Provided are: a method for treating a surface of a phosphor, whereby moisture-proof reliability can be enhanced without adversely affecting optical characteristics in a (Sr, Ca)AlSiN3 nitride phosphor; a phosphor; a light-emitting device; and an illumination device. A dipping step (step 1) for dipping a phosphor in which a host crystal thereof has a crystal structure essentially the same as a (Sr, Ca)AlSiN3 crystal in an aqueous solution including ammonium phosphate, and a heat treatment step (step 2) for maintaining the phosphor that has undergone the dipping step in a temperature environment of 250-550°C for 2-24 hours are performed.

Description

technical field [0001] The invention relates to a method for treating the surface of a phosphor, a phosphor treated by the method, a light-emitting device and a lighting device using the phosphor. In more detail, the present invention relates to a host crystal with (Sr,Ca)AlSiN 3 A surface treatment technique for phosphors with crystals having substantially the same crystal structure. Background technique [0002] Nitride phosphors containing Sr are easily degraded by oxygen, heat, moisture, etc., and there is a problem of humidity resistance reliability in particular. The reason for the deterioration of the moisture resistance reliability of the nitride phosphor containing Sr is that, for example, due to the reaction with moisture in the atmosphere or the process of contacting with water, strontium hydroxide is easily formed on the surface of the phosphor containing Sr. the hydrolyzed layer. [0003] As a method of improving the moisture resistance of the phosphor, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/08C09K11/64H01L33/50
CPCH01L33/502C09K11/64C09K11/643C09K11/025C09K11/77348C09K11/02B05D1/18C30B33/00C30B33/02
Inventor 竹田豪野野垣良三
Owner DENKA CO LTD
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