Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1996-09-27
1999-03-09
Bonner, Melissa
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
313483, C09K 1164, C09K 1177, C09K 1155
Patent
active
058795863
ABSTRACT:
An alkaline earth metal compound containing no fluorine atoms in its molecules, a rare earth compound containing no fluorine atoms in its molecules, and an aluminum compound containing no fluorine atoms in its molecules are fired in a high-temperature reducing atmosphere ranging from 1600.degree. to 2000.degree. C., so that an aluminate phosphor, the particle diameter and shape thereof are controlled, is provided. A mixture of 22 wt % of barium carbonate, 11 wt % of basic magnesium carbonate, 65 wt % of spherical alpha-alumina of 10 .mu.m diameter and 2 wt % of europium oxide is fired in a mixed gas atmosphere consisting of gaseous hydrogen of 5 volume % and gaseous nitrogen. The temperature is raised at 400.degree. C./hr, and lowered at 400.degree. C./hr after firing for two hours at 1700.degree. C. As a result, a spherical aluminate phosphor of 10 .mu.m diameter, which is expressed by formula (Ba.sub.0.9,Euo.sub.0.1)MgAl.sub.10 O.sub.17 is obtained.
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Horii Shigeru
Kitamura Koji
Matsuoka Tomizo
Nishiura Takeshi
Oshio Shozo
Bonner Melissa
Matsushita Electric - Industrial Co., Ltd.
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