HIGH LUMINANCE WHITE EL DEVICES USING SRSCE,EU,K FILMS DEPOSITED IN A H-2 ATMOSPHERE

White EL devices were fabricated using SrS:Ce, Eu, K phosphor films deposited in a reducing atmosphere of H-2. The highest luminance of 1700 cd/m2 was obtained under 1 kHz sinusoidal voltage drive. This value is 2.3 times larger than that of the devices without atmosphere of H-2. Compared to phosphor films prepared without an atmosphere of H-2 gas, the residual oxygen concentration in the films had decreased by one half, additionally, the X-ray diffraction pattern showed a preferential (200) orientation.