Method of making electroluminescent phosphor using...

Compositions – Inorganic luminescent compositions – Zinc or cadmium containing

Reexamination Certificate

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Reexamination Certificate

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07014793

ABSTRACT:
A method of making zinc sulfide based electroluminescent phosphors is described wherein a first-fired zinc sulfide material having a hexagonal β-ZnS crystal structure is at least partially converted to a distorted hexagonal β-ZnS crystal structure by ultrasonic irradiation. The first-fired material is then fired at a lower temperature to form an electroluminescent phosphor.

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