Blue-Green Emitting SrS:Ce, Cl Thin-Film Electroluminescent Devices Prepared by Reactive Evaporation Using H_2S Gas

概要

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SrS:Ce, Cl phosphor films were deposited by evaporating Sr metal and CeCl_3 in H_2S gas. The crystallinity, luminance, and emission spectra of the films were investigated in relation to the deposition conditions. X-ray diffraction intensity from the (200) plane of the SrS films was found to increase with the substrate temperature when the H_2S pressure was kept constant, and had the maximum value at the H_2S pressure of 1×10^<-2> Pa when the substrate temperature was kept constant. The variation of luminance in relation to the H_2S pressure and the substrate temperature was similar to that of the (200) diffraction intensity. The luminance of 600 cd / m^2 and the maximum emission efficiency as high as 1 lm/W were obtained at 1 kHz 30 μs wide ac pulse excitation for the films deposited at 600℃ and H_2S pressure of 1×10^<-2> Pa, although the emission color was not blue but whitish green.
社団法人応用物理学会の論文
1991-11-15