LUMINESCENT DEVICE - MATSUSHITA ELECTRIC IND CO LTD

Title:

LUMINESCENT DEVICE

Document Type and Number:

WIPO Patent Application WO/2006/109694

Kind Code:

A1

Abstract:

This invention provides a luminescent device comprising a blue fluorescent substance-containing fluorescent substance layer. The fluorescent substance layer comprises, as a blue fluorescent substance, an aluminate fluorescent substance comprising Ba, Sr, Eu, Mg, Al and O as constituent elements at an atomic ratio of Ba : Sr : Eu : Mg : Al : O = p : q : r : 1 : w : 17, wherein 0.70 ≤ p ≤ 0.95, 0 ≤ q ≤ 0.15, 0.05 ≤ r ≤ 0.20, p + q + r ≥ 1, and 9.8 ≤ w ≤ 10.5. When the aluminate fluorescent substance is subjected to X-ray crystal structure analysis on the assumption that the aluminate fluorescent substance belongs to a space group P6₃/mmc, the aluminate fluorescent substance has a linear bond function s of not more than 1 as calculated by s = -11622 + 2043.07L_a + 199.24L₁ - 116.91L₂ wherein L_a represents a lattice constant, Å; L₁ represents atomic distance between Al(2) and O(5), Å; and L₂ represents atomic distance between Al(1) and O(4), Å.

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Inventors:

SAKAI MASAHIRO
SHIRAISHI SEIGO
ZUKAWA TAKEHIRO
OKUYAMA KOJIRO
HIBINO JUNICHI
SUGIMOTO KAZUHIKO

Application Number:

PCT/JP2006/307373

Publication Date:

October 19, 2006

Filing Date:

April 06, 2006

Export Citation:

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Assignee:

MATSUSHITA ELECTRIC IND CO LTD (JP)
SAKAI MASAHIRO
SHIRAISHI SEIGO
ZUKAWA TAKEHIRO
OKUYAMA KOJIRO
HIBINO JUNICHI
SUGIMOTO KAZUHIKO

International Classes:

C09K11/64; H01J11/12; H01J11/42; H01J61/44

Foreign References:

JP2003336061A	2003-11-28
JP2002180043A	2002-06-26
JP2005336449A	2005-12-08

Attorney, Agent or Firm:

Kamada, Koichi (TOMOE MARION BLDG. 4-3-1, Nishitenma, Kita-k, Osaka-shi Osaka 47, JP)

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