FLUORESCENT LAMP UTILIZING ZINC SILICATE PHOSPHOR WITH IMPROVED LUMEN MAINTENANCE

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Disclosed herein is a mercury vapor discharge lamp and methods for making same, where the lamp comprises a phosphor coating layer disposed on at least a portion of the inner surface of the lamp envelope. The phosphor coating layer comprises a phosphor composition comprising a colloidal alumina, particles comprising at least one rare earth compound, and phosphor particles, and the particles comprising at least one rare earth compound are present in the phosphor composition in an amount from about 0.5 percent to about 5 percent of the weight of the phosphor particles. The presence of colloidal alumina, the rare earth compound, and these selected phosphors may contribute to an increase at least one of lumen output or lumen maintenance for the lamp, as compared with the same mercury vapor discharge lamp comprising the same phosphor composition without colloidal alumina and without the particles comprising at least one rare earth compound.