Transformation of resonant Raman scattering into luminescence in CdxZn1−xTe mixed crystals: Time-resolved spectroscopy |
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Authors: | A Nakamura M Shimura M Hirai S Nakashima |
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Institution: | 1. Department of Applied Physics, Faculty of Engineering Tohoku University, Sendai, 980 JAPAN;1. Department of Applied Physics, Faculty of Engineering Osaka University, Suita, 565 JAPAN |
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Abstract: | We report an experimental study of time characteristics of secondary emission in CdxZn1-xTe mixed crystals (x = 0.32) under resonant excitation with a picosecond dye laser. When the incident laser frequency is tuned on to the luminescence maximum of localized excitons, the decay curve of the intensity of “Raman-like” lines exhibits a single exponential decay. Off resonance, however, a short-lived component corresponding to Raman scattering appears in addition to the long-lived component. The intensity of the Raman component relative to that of the luminescence component increases with increase of the off-resonance frequency. From these temporal behaviors, we have found, for the first time, the transformation of resonant Raman scattering into luminescence in mixed crystals as a function of incident frequencies. |
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