C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
313/34, 313/80
C09K 11/02 (2006.01) H05B 33/10 (2006.01) H05B 33/14 (2006.01) H05B 33/20 (2006.01)
Patent
CA 1309453
Abstract of the Disclosure Electroluminescent phosphors, electrolumi- nescent panels and lamps made with such phosphors, and a process and apparatus for treating phosphors are disclosed in which the phosphor particles (50) are coated with a very thin coating (80) of SiO2, to protect the phosphor particles from aging due to moisture intrusion. The phosphor particles are coated in a cold wall reactor (10) by the pyrolytic decomposition of silane in the presence of heat and oxygen to a coating thickness of approximately between 0.1 and 3.0 microns. The apparatus and method of coating includes the placement of a quantity of phosphor in a cup-shaped heated reactor bowl (30) and subjecting the particles to a temperature of about 490°C and an atmosphere of silane and oxygen, while continuously mechanically agitating the particles with a blade (44) in which the particles are continuously rotated and turned so as to expose the surfaces of the heated particles to the reaction atmosphere. Panels and lamps made from such phosphors may be die cut and trimmed, have an increased life as compared to panels and lamps made with untreated phosphors, and exhibit a minimum of color shift during the lifetime of the panel.
583878
Simopoulos George N.
Simopoulos Nicholas T.
Gowling Lafleur Henderson Llp
Lumel Inc.
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