Process for the preparation of a red emitting phosphor coated wi

Details Process for the preparation of a red emitting phosphor coated wi Process for the preparation of a red emitting phosphor coated wi

1979-12-31

1981-10-27

Hoffman, James R.

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 68, 427157, 427 21S, C09K 1146, C09K 11477, C09K 11465, C09K 1122

Patent

active

042973902

ABSTRACT:
Filter phosphors consist of phosphor particles coated with a filter material. A phosphor which shows a red emission when excited by cathode rays may be coated with red iron oxide by producing a thin layer of pyrite on the phosphor particles and thereafter converting the said layer into hematite. Thus, the surface of the phosphor particles is evenly coated with a uniform, dense pigment layer of extreme adherence. The filter phosphors thus obtained are used in cathode ray tubes and especially in color picture tubes.

REFERENCES:
patent: 2959483 (1960-11-01), Kaplan
patent: 3114065 (1963-12-01), Kaplan
patent: 3308326 (1967-03-01), Kaplan
patent: 3875449 (1975-04-01), Byler et al.
patent: 4020231 (1977-04-01), Hepler et al.
Patent Abstracts of Japan, vol. 2, Nr. 76 (6/16/78).

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