Method for improving the performance of low pressure fluorescent

Details Method for improving the performance of low pressure fluorescent Method for improving the performance of low pressure fluorescent

1978-10-27

1980-06-17

Esposito, Michael F.

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427106, 427220, 427230, 427309, 313487, 2523016R, 29 2511, H01J 6102, H01J 922

Patent

active

042084482

ABSTRACT:
A method of improving the long term operating appearance of a low pressure fluorescent discharge lamp having an elongated tubular vitreous envelope and incorporating a phosphor layer carried as a coating on the interior surface thereof. The phosphor layer essentially consists of a mixed homogeneous three-component blend. The phosphor blend has a blue-violet-emitting phosphor component, a red-orange-emitting phosphor component and a green-emitting phosphor component. The green-emitting phosphor component is zinc silicate activated with manganese. The method entails prior to mixing the phosphors together, washing the zinc silicate phosphor in an aqueous organic acid solution. The organic acid solution consists of at least one of acetic, succinic and terephthalic. The acid washed zinc silicate phosphor is separated from the washing solution and dried. It is then suspended as a part of an aqueous envelope coating paint and applied to the envelope interior surface in the usual manner.

REFERENCES:
patent: 3165476 (1965-01-01), Wachtel
patent: 3303042 (1967-02-01), Reed
patent: 3649329 (1972-03-01), Taubner
patent: 3757938 (1973-09-01), Wachtel
patent: 3858082 (1974-12-01), Thornton

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