Method of reducing the degradation of the red phosphor, Y203:EU,

Details Method of reducing the degradation of the red phosphor, Y203:EU, Method of reducing the degradation of the red phosphor, Y203:EU,

1990-12-21

1992-06-30

Lusignan, Michael

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 64, 427215, 313489, B05D 506, B05D 700

Patent

active

051261669

ABSTRACT:
A method has been found which reduces substantially the degradation of the red phosphor, Y.sub.2 O.sub.3 :Eu, in water base fluorescent lamp suspension, thereby prolonging the shelf life of triphosphor suspensions. The method of the invention comprises forming a protective coating around individual particles of europium-doped yttrium oxide phosphor to inhibit degradation of europium-doped yttrium oxide phosphor in a water base phosphor coating suspension, the protective coating comprising an inorganic material and being of sufficient thickness to prevent the europium-doped yttrium oxide phosphor from reacting with the coating suspension. A preferred coating material is gamma-alumina.

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patent: 5049408 (1991-09-01), Klinedinst et al.
Kotrly and Sucho, Handbook of Chemical Equilibria In Analytical Chemistry, Ellis Horwood, 1985.
Butler, Fluoresent Lamp Phosphors, Technology and Theory, Penn State University Press (1980).
C. Pantano, "Oxynitride Thin Films from the Sol-Gel Process," Sol-Gel Technology for Thin Films, Fibers, Preporms, Electronics and Specialty Shapes, edited by Lisa C. Klein, Noyes Publications, 1988.

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