Low-Temperature Observation of Photoinduced Electron Transfer from CdTe Nanocrystals
Low-Temperature Observation of Photoinduced Electron Transfer from CdTe Nanocrystals
复制标题
DOI：
10.1021/jp900470m
复制
发表时间：
2009-07-09
影响因子：
3.7
通讯作者：
Kawai, Tsuyoshi
中科院分区：
文献类型：
--
作者：
Nonoguchi, Yoshiyuki;Nakashima, Takuya;Kawai, Tsuyoshi
用稳态光致发光光谱和低温时间分辨光致发光光谱研究了CdTe纳米晶（NC）到光致发光猝灭剂1，2，4，5-四氰基苯（TCNB）的光诱导电子转移. TCNB主要通过静态电子转移过程猝灭CdTe NCs的光致发光，并且在50 K以下还观察到明显缓慢的纳秒级猝灭衰减。基于由电子-空穴交换相互作用产生的CdTe NC的激子精细结构，讨论了低温下电荷分离速率常数的特征温度依赖性。
Photoinduced electron transfer from a CdTe nanocrystal (NC) to a photoluminescence quencher, 1,2,4,5-tetracyanobenzene (TCNB), has been studied with both steady-state photoluminescence spectroscopy and low-temperature time-resolved photoluminescence spectroscopy. The photoluminescence of CdTe NCs is quenched by TCNB mainly through a static electron transfer process and apparently slow quenching decay in nanosecond order is also observed below 50 K. Characteristic temperature dependence of charge separation rate constant at low temperature is discussed on the basis of exciton fine structure of the CdTe NC generated by an electron-hole exchange interaction.