Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1989-05-08
1990-10-09
Bell, Janyce
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
427213, 427215, 4272553, 4272555, B05D 500
Patent
active
049619560
ABSTRACT:
Electroluminescent phosphors, electroluminescent panels and lamps made with such phosphors, and a process and apparatus for treating phosphors are disclosed in which the phosphor particles are coated with a very thin coating of SiO.sub.2, to protect the phosphor particles from aging due to moisture intrusion. The phosphor particles are coated in a cold wall reactor by the pyrolytic decomposition of silane in the presence of heat and oxygen to a coating thickness of approximatley 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 and subjecting the particles to a temperature of about 490.degree. C. and an atmosphere of silane and oxygen, while continuously mechanically agitating the particles with a blade arrangement 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.
REFERENCES:
patent: 2689188 (1954-09-01), Hushley
patent: 2944177 (1960-07-01), Piper
patent: 2951169 (1960-08-01), Faria et al.
patent: 3005721 (1961-10-01), Cerulli
patent: 3163592 (1964-12-01), Dolan et al.
patent: 3264133 (1966-08-01), Brooks
patent: 3294569 (1966-12-01), Messineo et al.
patent: 3376453 (1968-04-01), Leach
patent: 3394031 (1968-07-01), Ramm
patent: 3408223 (1968-10-01), Shortes
patent: 3492105 (1970-01-01), Peaender
patent: 3984587 (1976-10-01), Lipp
patent: 4097776 (1978-06-01), Allinikov
patent: 4122213 (1978-10-01), Ito et al.
patent: 4143297 (1979-03-01), Fischer
patent: 4181953 (1980-01-01), Fischer
patent: 4263339 (1981-04-01), Fischer
patent: 4508760 (1985-04-01), Olson et al.
patent: 4544605 (1985-10-01), Miyazki et al.
patent: 4585678 (1986-04-01), Ligai
patent: 4592924 (1986-06-01), Kuppers et al.
patent: 4661381 (1987-04-01), Callies et al.
"Fundamentals of Silicon Integrated Device Technology", vol. 1, Burger et al., Prentice-Hall, Inc., 1967, pp. 36-105.
U.S. Defense Department Technical Report AFFDL-TR-68, 103 "Improving the Performance of Electroluminescent Lamps at Elevated Temperatures", Jul. 1978.
Simopoulos George N.
Simopoulos Nicholas T.
Bell Janyce
Lumel, Inc.
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