Manufacturing method for red phosphor

Details Manufacturing method for red phosphor Manufacturing method for red phosphor

1989-12-15

1991-10-08

Cooper, Jack

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C09K 1178

Patent

active

050552260

ABSTRACT:
A manufacturing method for a Y.sub.2 O.sub.3 : Eu red phosphor is disclosed in which yttrium oxide and europium oxide are used, and also a composite flux composed of a mixture of Na.sub.2 CO.sub.3, NaF and B.sub.2 O.sub.3 is used. The Y.sub.2 O.sub.3 : Eu red phosphor according to the present invention is uniform in its particle size distribution, has a desirable spherical particle shape, shows a perfect filling state of the layer, and shows a luminance improvement by 4-7% over that of the conventional phosphor.

REFERENCES:
patent: 3842012 (1974-10-01), Hoppenbrouwers
patent: 4032471 (1977-06-01), Luckey
patent: 4801398 (1989-01-01), Ohno et al.

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