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中文摘要：
利用飞秒时间分辨瞬时吸收光谱技术,研究了甲苯溶液中CdTe纳米晶的超快动力学过程.结果表明,CdTe的最大吸收强度随泵浦光强线性变化,这说明在所用泵浦光强下,样品没有发生光退化.当固定泵浦光强时,测量得到的不同光学密度时的瞬时吸收光谱可以用双指数函数很好地拟合,这意味着CdTe中的载流子弛豫过程主要包含两个过程,分别为较快的表面态电子俘获过程和较慢的表面态电子与价带底空穴的复合过程.实验结果表明,当光学密度增加时较快过程的弛豫时间随光学密度的增加而增加,这是由于CdTe纳米晶间的相互作用增强,阻碍了能量向周围溶剂的扩散;而较慢过程的弛豫时间却是减小的,这是由光学密度对CdTe纳米晶表面态的影响导致的.
英文摘要：
The ultrafast dynamic processes of CdTe nanocrystal in toluene were researched by using femtosecond time-resolved transient absorption spectroscopy.The results showed that the maximum absorption intensity increased linearly with the pump intensity,which indicated that the sample did not take place photo-induced degradation in the range of the pump intensity used.At the fixed pump intensity,the measured transient absorption spectroscopy of CdTe nanocrystal with different optical density could be fitted very well by a bi-exponential function.This means that there are two carrier relaxation processes,the faster one is assigned to the excited electrons trapping by the surface states,and the slower one is attributed to electron relaxation to the valence band bottom by electron-hole recombination.Due to the enhanced interaction between the CdTe nanocrystals,the energy diffusion to the surrounding was hindered,which led to the decay time of the faster process increasing.However,the decay time of the slower process decreased because of the influence of optical density on the surface states.
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