Long afterglow phosphor and a process for the preparing thereof

Details Long afterglow phosphor and a process for the preparing thereof Long afterglow phosphor and a process for the preparing thereof

1996-08-29

1999-03-23

Bonner, Melissa

Compositions

Inorganic luminescent compositions

Tungsten containing

C09K 1164

Patent

active

058854835

ABSTRACT:
The invention relates to a long afterglow phosphor and a process for preparing the phosphor, characterized in that the phosphor comprises the O.sub.3.sup..alpha. .div.(1-a)Al.sub.2 O.sub.3.sup..gamma. !.multidot.B.sub.2 O.sub.3 : R, where, M represents and alkaline earth metal, R represents a rare earth element, 0.5<a.ltoreq.0.99, 0.001.ltoreq.x.ltoreq.0.35, and 1.ltoreq.n.ltoreq.8, and a part of M may be replaced with at least one alkaline earth metal selected from Mg, Ca and Ba. R may also use other rare earth elements in addition to Eu as additional activators. The process for preparing the long afterglow phosphor of the present invention comprises several steps, wherein the sintering temperature needs to be 800.degree.-1200.degree. C.

REFERENCES:
patent: 3294699 (1966-12-01), Lange
patent: 4840747 (1989-06-01), Fan et al.
patent: 5376303 (1994-12-01), Royce et al.

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