C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/121
C09K 11/02 (2006.01) H01J 61/44 (2006.01)
Patent
CA 1264223
85-3-029/031 METHODS FOR COATING PHOSPHOR PARTICLES, AND PHOSPHOR PARTICLE, FLUORESCENT LAMP, AND MANUFACTURING METHOD Abstract Disclosed is a method for applying a continuous protective coating to the surface of individual phosphor particles. The method involves chemical vapor deposition of the protective coating on individual particles of a phosphor powder while the phosphor particles are suspended in a fluidized bed. During the method, the fluidized particles are exposed to the vaporized coating precursor material at a first temperature, which is less than the decomposition temperature of the precursor material, and the precursor material is reacted to form the desired coating material at a second temperature, which is greater than or equal to the temperature at which the precursor material reacts to form the coating material. A phosphor particle having a continuous protective coating is also disclosed. A method for improving the lumen maintenance of a fluorescent lamp and a fluorescent lamp having improved maintenance are further disclosed. The method involves applying a non-particulate, conformal aluminum oxide coating to the outer surface of individual particles of a finely-divided fluorescent lamp phosphor, applying the coated phosphor particles to a fluorescent lamp envelope, and processing the phosphor coated envelope into a finished lamp.
479185
Gte Products Corporation
R. William Wray & Associates
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