PROCESS FOR PRODUCTION OF Eu-ACTIVATED ALKALINE EARTH METAL SILICATE PHOSPHOR

Title:

PROCESS FOR PRODUCTION OF Eu-ACTIVATED ALKALINE EARTH METAL SILICATE PHOSPHOR

Document Type and Number:

WIPO Patent Application WO/2011/148910

Kind Code:

A1

Abstract:

Provided is a process for the production of an Eu-activated alkaline earth metal silicate phosphor wherein the ratio of the total number of constituent metal atoms (Sr, Ba, Eu, Si) to the number of constituent Si atoms is 4 : 1 or 3 : 1. According to the process, a precursor having a uniform chemical composition can be synthesized at a lower temperature than that of a conventional process, and a single-phase Eu-activated alkaline earth metal silicate phosphor that has a uniform chemical composition and exhibits high luminance can be efficiently produced at a low cost by heat-treating the precursor. A process for the production of an Eu-activated alkaline earth metal silicate phosphor, characterized by including a step (1) of preparing aqueous solutions that contain the constituent metal components, namely, strontium, barium, europium, and silicon respectively, mixing the aqueous solutions together, and keeping the resulting mixture at a solution temperature of 30 to 100°C to form a transparent gel wherein all the metal components are dispersed uniformly and completely.

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Inventors:

KAKIHANA Masato (C/O TOHOKU UNIVERSITY, 2-1-1 Katahira Aoba-ku, Sendai-sh, Miyagi 77, 〒9808577, JP)
垣花　眞人 (〒77 宮城県仙台市青葉区片平二丁目１番１号国立大学法人東北大学内 Miyagi, 〒9808577, JP)
TAKATSUKA Yuji (Sumitomo Metal Mining Co. Ltd., 18-5, Nakakokubun 3-chome, Ichikawa-sh, Chiba 88, 〒2728588, JP)

Application Number:

JP2011/061789

Publication Date:

December 01, 2011

Filing Date:

May 23, 2011

Export Citation:

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Assignee:

SUMITOMO METAL MINING CO.,LTD. (11-3, Shimbashi 5-chome Minato-k, Tokyo 16, 〒1058716, JP)
住友金属鉱山株式会社 (〒16 東京都港区新橋５丁目１１番３号 Tokyo, 〒1058716, JP)
TOHOKU UNIVERSITY (2-1-1 Katahira, Aoba-ku Sendai-sh, Miyagi 77, 〒9808577, JP)
国立大学法人東北大学 (〒77 宮城県仙台市青葉区片平二丁目１番１号 Miyagi, 〒9808577, JP)
KAKIHANA Masato (C/O TOHOKU UNIVERSITY, 2-1-1 Katahira Aoba-ku, Sendai-sh, Miyagi 77, 〒9808577, JP)

International Classes:

C09K11/08; C09K11/59

Attorney, Agent or Firm:

OSHIDA Yoshitaka (Ginza bldg, 3-12 Ginza 3-chome, Chuo-k, Tokyo 61, 〒1040061, JP)

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