PHOSPOR AND FLUORESCENT LAMP MADE BY USING THE SAME

Title:

PHOSPOR AND FLUORESCENT LAMP MADE BY USING THE SAME

Document Type and Number:

WIPO Patent Application WO/1994/019422

Kind Code:

A1

Abstract:

A red-emitting phosphor prepared by mixing 1 mole of a europium-activated rare earth oxide phosphor represented by general formula (L1-xEux)2O3 (wherein L represents at least one rare earth element and 0.01 X 0.20) with 10-6-10-3 mole of each of phosphorus and at least one alkaline earth metal selected from among megnesium, calcium, strontium and barium. The phosphor has a high initial emission luminance (efficiency) and is reduced in the efficiency drop when the light is on. The fluorescent lamp of the invention is made by coating the inner wall surface of a glass tube with a phosphor layer containing the above phosphor at least as a red-emitting component and is capable of controlling changes in emission efficiency and chromaticity with time.

Inventors:

SUGIMOTO YUJI (JP)
SHIMIZU YOUHEI (JP)

Application Number:

PCT/JP1994/000305

Publication Date:

September 01, 1994

Filing Date:

February 25, 1994

Export Citation:

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Assignee:

TOSHIBA KK (JP)
SUGIMOTO YUJI (JP)
SHIMIZU YOUHEI (JP)

International Classes:

C09K11/77; C09K11/78; H01J61/44; (IPC1-7): C09K11/78

Foreign References:

JPS63128094A	1988-05-31
JPS58127777A	1983-07-29
JPS5699276A	1981-08-10

Other References: