Cd_(0.96)Zn_(0.04)Te低温Raman光谱中荧光背景的猝灭现象

研究了Cd0 .96 Zn0 .0 4Te表面低温Raman散射光谱中的样品荧光背景随激光功率的变化行为 ,观察到了荧光的“猝灭”现象和同时伴随的声子峰红移 .分析表明样品荧光的“猝灭”现象与声子峰红移显示的表面结构变化有关 ,而激光对Cd0 .96 Zn0 .0 4Te表面的加热是导致表面晶体结构变化的原因 .

QUENCHING OF THE FLUORESCENCE BACKGROUND IN Cd_(0.96)Zn_(0.04)Te 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 temperatures. The fluorescence signals “burning out” were obs erved, accompanied by a red shift of the material's phonon peaks. It was shown that the “burning out” of the fluorescence signals was correlated to the transf ormation of the crystal surface structure, which was directly indicated by the red shift of the phonons. The exciting laser should be responsible for the structure transformation.