Method of manufacturing fluorescent material

Compositions – Inorganic luminescent compositions – Zinc or cadmium containing

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2523016F, C09K 1156, C09K 1154

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active

061432016

ABSTRACT:
In the production of a fluorescent material, firstly a particle growth retardant is mixed with a fluorescent raw material and then the mixture is baked, whereupon the baked mixture is washed and dried as an intermediate fluorescent material. Then, the particle growth retardant is removed from the surface of the intermediate fluorescent material and crystal defects are formed in the particle-growth-retardant-free intermediate fluorescent material using a ball mill or an ultrasonic vibrator, etc. Finally, the resulting intermediate fluorescent material is baked again and is then washed and dried as a final fluorescent material. This fluorescent material is particularly useful when used in a scatter electroluminescent panel serving as a back light of a liquid crystal display, which must be very small in thickness and light in weight.

REFERENCES:
patent: 2402759 (1946-06-01), Leverenz
patent: 5250365 (1993-10-01), Hedden et al.
Ball Mill Handbook, the first edition, Publisher: Nikkon Kogyo Shimbun, May 30, 1995.

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