ELECTROLUMINESCENT PHOSPHOR, MANUFACTURING METHOD THEREFOR, AND ELECTROLUMINESCENT ELEMENT THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide an electroluminescent(EL) phosphor for an EL element that is used for illuminating various electronic apparatuses or the like, wherein little brightness degradation shows up even under a combination of high temperature and high humidity, a manufacturing method therefor, and an EL element therewith. SOLUTION: A moisture-proof coating film 14B composed of a light transmitting silicon oxide and a metal fluoride is formed on the surface of phosphor particles 14A, by using a vapor mixture composed of the silicon oxide and the metal fluoride. An EL phosphor 14 thus prepared is used for constituting a phosphor layer 15 of an EL element. Brightness degradation of the EL phosphor is small.