Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1992-07-13
1995-05-23
Nakarani, D. S.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
2523016R, 2523014S, 4272481, 4272553, 428404, 428690, 428917, B32B 516
Patent
active
054180627
ABSTRACT:
Encapsulated electroluminescent phosphor particles and method for making same. The phosphor particles are encapsulated in a very thin oxide layer to protect them from aging due to moisture intrusion. The particles are encapsulated via a vapor phase hydrolysis reaction of oxide precursor materials at a temperature of between about 25.degree. C. and about 170.degree. C., preferably between about 100.degree. C. and about 150.degree. C. The resultant encapsulated particles exhibit a surprising combination of high initial luminescent brightness and high resistance to humidity-accelerated brightness decay.
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Griswold Gary L.
Kirn Walter N.
Le H. T.
Minnesota Mining and Manufacturing Company
Nakarani D. S.
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