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Study on the Crystallographic and Photoluminescent Properties of Cd3InGaS6. II. Photoluminescence

Photoluminescence spectra and X-ray powder diffraction were measured for the system CdxInGaS3+x (1.0≦x≦3.5) in order to clarify the origin of the intense green photoluminescence of Cd3InGaS6, which is a laminated material of CdS and CdInGaS4. It was found that the intensity of the green emission is intimately correlated with the intensity of the X-ray diffraction line at 2θ=26.5° which indicates a criterion of the formation of the laminated structure. The same experiment on the mixed powder of CdS and CdInGaS4 also revealed the same intimate correlation between intensities of the green emission and the X-ray diffraction line at 2θ=26.5°. Heterostructure CdS/CdInGaS4 prepared by chemical vapor deposition was found to show very intense green emission similar to that observed in Cd3InGaS6. A laminated structure model for the intense green emission is proposed. The model was examined by thermoluminescence measurements.