Quenching of the fluorescence background in Cd0.96Zn0.04Te Raman spectrum at low temperatures

Variation of fluorescence background in the Raman spectrum was investigated versus laser power, which was measured on Cd0.96Zn0.04Te surface at low te mperatures. The fluorescence signals "buming out" were observed, accompanie d by a red shift of the material's phonon peaks. It was shown that the "bur ning out" of the fluorescence signals was correlated to the transformation of the crystal surface structure, which was directly indicated by the red s hift of the phonons. The exciting laser should be responsible for the struc ture transformation.