Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1997-01-03
1997-12-09
Bonner, Melissa
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
25230165, 2523014R, 2523014S, 2523016F, 2523014P, 2523014H, C09K 1100
Patent
active
056956851
ABSTRACT:
A surface modified phosphor powder exhibiting increased lumen maintenance. At the outer surface of each phosphor particle, the cations of the phosphor material have been replaced by other cations, e.g., a metal or metalloid cation such as aluminum, barium, calcium, lanthanum, magnesium, strontium, yttrium, zinc, titanium, tantalum, boron, or silicon. The phosphor powder is chemically modified by forming a suspension of phosphor particles in a liquid medium including the metal or metalloid ions in solution. The phosphor suspension is stirred for a time sufficient to permit an ion exchange reaction in which the metal or metalloid ions are substituted for cations of the phosphor to form a layer of the desired metal or metalloid compound at the phosphor outer surface.
REFERENCES:
patent: 4265950 (1981-05-01), Graff
patent: 4710674 (1987-12-01), Sigai
patent: 5196229 (1993-03-01), Chau
patent: 5433888 (1995-07-01), Okada et al.
patent: 5624603 (1997-04-01), Leblans et al.
Bonner Melissa
Clark Robert F.
Osram Sylvania Inc.
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