Osram Sylvania Inc.

Tracy V Silloway

Paul W Salvi

Chung-Nin Chau

Chung Nin Chau

Karen Lee

John S Tulk

Steven C Fowler

A method for providing an adherent, continuous, conformal, non-particulate coating of a compound of a metal or metalloid on the surface of individual phosphor particles. The method involves wetting each of the individual particles with a polymer solution including a polymer in a solvent base, the polymer being capable of chelating ions of the metal or metalloid. The particles then are dried to produce a continuous coating of the polymer on each of the individual particles. The polymer-coated phosphor particles are suspended in a solution containing ions of the metal or metalloid and having a pH of at least 9 to produce chelation of the metal or metalloid ions by the polymer coating, to produce the adherent, continuous, conformal, non-particulate, metal- or metalloid-compound coating on the particle surfaces. Also described are a method for improving lumen maintenance of a lamp, a coated phosphor powder, and a phosphor-coating composition for coating an inner surface of a lamp envelope.

Phosphor powder for coating lamp envelopes and method for preparation

An aqueous coating suspension for a fluorescent lamp comprises particles of an alkaline earth chlorofluorophosphate phosphor activated by antimony and manganese, water, at least one water soluble binder, a defoaming agent, a surface active agent and a sufficient amount of ammonium chloride for improving lamp maintenance.

Aqueous phosphor coating suspension for lamps

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Hampton, NH, United States of America

Tracy V Silloway