Preparation and luminescent characteristics of an oxide phosphor Gd3Ga5O12: Ag

A composite oxide material Gd3Ga5O12:Ag was prepared by solid state reactio n. The composition and the crystallinity of phosphor were determined by X-r ay diffraction. The thin film electroluminescence (EL) devices based on Gd3 Ga5 O-12:Ag were prepared by electron beam evaporation. We have obtained a good UV-blue EL emission with a peak at 397 nm and a shoulder at 467 nm. Th e EL peaks located at 397 and 467 nm are found to originate from the oxide vacancies and 4d(9)5s(0) to 4d(10) of Ag+, respectively.