Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1990-10-05
1992-01-14
Beck, Shrive
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
427 66, 427 69, 427213, 427215, 427220, 4272552, 4272556, B05D 512, B05D 700, C23C 1600, C23C 1644
Patent
active
050809288
ABSTRACT:
A process is disclosed for coating phosphors with hydrolyzed alkylaluminum. The hydrolyzed alkylaluminum coating renders the phosphors insensitive to atmospheric moisture. the coating process involves vaporizing an aluminum-containing precursor such as trimethylaluminum or triethylaluminum in an inert gas stream and passing this through a fluidized bed containing the phosphor particles. Water vapor is also passed through the fluidized bed and the water and aluminum precursor react on the surface of the phosphor particles to form hydrolyzed trimethylaluminum or other alkylaluminum. The hydrolyzed trimethylaluminum or other alkylaluminum phosphors are particularly useful in electroluminescent lamps.
REFERENCES:
patent: 4585673 (1986-04-01), Sigai
patent: 4855189 (1989-08-01), Simopoulos et al.
A. G. Fisher et al., Advances in AC-Electroluminescent Powder Layers, SPIE vol. 99 3rd European Electro-Optics Conf. (1976) pp. 202-208.
S. Roberts, Aging Characteristics of Electroluminescent Phoshors, Jour. of Appld. Phys. vol. 28, No. 2, Feb. 1957 pp. 262-265.
W. A. Thornton, Electroluminescence Maintence, J. of Electrochemical Soc., vol. 107, No. 11, (Nov. 1960) pp. 895-907.
K. Wefers, G. M. Bell "Oxides and Hydroxides of Aluminum" Tech. Paper 19, Alcoa Research Lab., East St. Louis, 111 1972.
T. A. Mole, E. A. Jeffery, "Organoaluminium Compounds" Elsevier Publishing Co, Amsterdam, 1972 Chapter 8.
Gary Richard A.
Klinedinst Keith A.
Lichtensteiger Silvia E.
Beck Shrive
Burke Margaret
GTE Laboratories Incorporated
Ruoff Carl F.
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