Electroluminescent phosphor with extended life and method of mak

Details Electroluminescent phosphor with extended life and method of mak Electroluminescent phosphor with extended life and method of mak

1998-12-18

2000-09-05

Koslow, C. Melissa

Compositions

Inorganic luminescent compositions

Zinc or cadmium containing

C09K 1154, C09K 1156

Patent

active

061138088

ABSTRACT:
An electroluminescent phosphor containing an effective amount of bismuth to increase the half-life of the phosphor compared to the half-life of the phosphor without the bismuth. The phosphor is produced by the method comprising the steps of preparing the electroluminescent phosphor; adding granular, elemental bismuth to the bottom of a quartz reaction vessel; covering the bismuth with a layer of quartz wool; placing the phosphor on top of the quartz wool; evacuating the reaction vessel to about 750-760 mm Hg and sealing the vessel; and heating the vessel to between about 500 to 700.degree. C. for about 24 to 72 hours.

REFERENCES:
patent: 3657142 (1972-04-01), Poss

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