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Electroluminescence in ZnS1-xTex:CeF3 Thin-Film Devices Prepared in Oxygen Atmosphere

The effects of oxygen codoping on ZnS1-xTex:CeF3 thin-film electro-luminescent devices are reported. ZnS1-xTex:CeF3 (x=0 and 1.25×10-3) films are prepared at substrate temperatures of 200°C and 300°C in vacuum and in oxygen remarkably. X-ray diffraction studies showed that the film orientation of the (111) plane and film uniformity are markedly improved when the films are prepared at 300°C in oxygen atmosphere. The emissive peak position and intensity of ZnS1-xTex:CeF3 devices change with substrate temperature and annealing, depending on the background atmosphere during film deposition. Oxygen codoping at a higher substrate temperature leads to an enhancement of luminance.