Nitride coated particle and composition of matter comprised of s

Details Nitride coated particle and composition of matter comprised of s Nitride coated particle and composition of matter comprised of s

1998-10-20

2000-05-16

Patel, Vip

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313502, H01J 162

Patent

active

060641509

ABSTRACT:
A phosphor particle having thereon a conformal coating of aluminum nitride. By conformal coating is meant a coating that follows the surface contours of the individual particles. The method of making such phosphors comprises the steps of introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a nitride coating precursor into the reaction vessel; introducing a coreactant into the reaction vessel; and maintaining the inert gas flow, coreactant flow and precursor supply for a time sufficient to coat the phosphor particles. The nitride coated phosphor particles produced by this method have excellent efficacy ratings and strong luminance values in lamps after 100 hours use in high humidity (i.e.,>95%).

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Study on Surface Treatment of fluorescent powders Takashi Hirate: Reports of Faculty of Eng.; pp. 39-43 (1990).
Chemical Vapor Deposition of AW thin films; Gordon, et al. J. Mater. Res., vol. 7, No. 7, Jul. 1992, pp. 1679-1684.
Atmospheric pressure chemical vapor dep, of AIN thin . . . films Gordon, et al., J. Mater. Res., vol. 6, No. 1, Jan 1991 pp. 5-7.

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