Abstract: A method for preparing a specific zinc orthosilicate phosphor particle having a nonparticulate, conformal aluminum oxide coating wherein all of a manganese activator is present as manganese (II) and occupies zinc (II) sites includes the steps of blending a zinc source, a manganese (II) source, a silicon source, and a tungsten source in amounts in accordance with said formula with an amount of up to about 2 weight percent NH.sub.4 Cl and up to about 0.2 weight percent NH.sub.

Abstract: An improved fluorescent lamp is disclosed. The lamp of the present invention includes an envelope containing an ionizable medium including mercury and having electrodes located within the envelope; an aluminum oxide reflector layer on the inner surface of the envelope, and a phosphor layer disposed on the reflector layer. The aluminum oxide reflector layer comprises particles of high purity aluminum oxide having an average particle size greater than 0.5 micrometer and less than or equal to about 1 micrometer and having a surface area of about 4 to 6 meter.sup.2 /gram. The aluminum oxide reflector layer preferably includes at least 95 weight percent alpha-alumina. Preferred coating weights for the reflector layer are from about 8.8 to about 11.1 milligram/square centimeter.

Abstract: An improved aperture fluorescent reprographic lamp is disclosed. The lamp of the present invention includes an elongated envelope containing an ionizable medium including mercury and having electrodes at each end of the envelope: a reflector layer on a major portion of the inner surface of the envelope, a phosphor layer disposed on and coextensive with the reflector layer, and a protective coating over at least the portion of the inner surface of the lamp envelope not covered with the reflector layer. The phosphor layer comprises particles of green-emitting zinc orthosilicate phosphor which are individually coated with a non-particulate, conformal aluminum oxide coating.

Abstract: Lumen maintenance of fluorescent lamps is improved by overcoating the phosphor layer with a coating of submicron size alumina having a weight greater than 160 micrograms per square centimeter.

Abstract: A fluorescent lamp has two phosphor layers, the phosphor of the first layer being less expensive than the phosphor of the second layer. The second phosphor layer improves the lamp efficiency.

Abstract: A fluorescent lamp has a phosphor coating on the interior surface of the lamp envelope. Dispersed throughout the coating is a melted and solidified amorphous borate-phosphate frit to improve the adhesion of the phosphor.

Abstract: A fluorescent lamp contains a blend of phosphors to provide predetermined minimum power levels of radiation at predetermined spectral bands that are used in the analysis of liquid samples placed close to the lamp.