Excitons and Biexciton Dynamics in Single CsPbBr3 Perovskite Quantum Dots
Excitons and Biexciton Dynamics in Single CsPbBr3 Perovskite Quantum Dots
复制标题
单 CsPbBr3 钙钛矿量子点中的激子和双激子动力学
DOI：
10.1021/acs.jpclett.8b03098
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发表时间：
2018
影响因子：
5.7
通讯作者：
Jia Suotang
中科院分区：
文献类型：
--
作者：
Li Bin;Huang He;Zhang Guofeng;Yang Changgang;Guo Wenli;Chen Ruiyun;Qin Chengbing;Gao Yan;Biju Vasudevan P.;Rogach Andrey L.;Xiao Liantuan;Jia Suotang
胶体卤化铅钙钛矿量子点，由于其光学多功能性和容易的溶液加工性，最近已被认为是各种光电器件的组件。在单粒子水平上详细了解它们的激子复合动力学对于充分利用它们的潜力是必要的。我们对CsPbBr3钙钛矿量子点中的激子和双激子动力学进行了光谱研究。研究发现，虽然辐射复合速率基本保持恒定，但总体弛豫过程由单激子和双激子的非辐射复合主导。单激子的辐射寿命标度为1.0，双激子的辐射寿命标度为4.4。荧光寿命与强度分布的线性关系符合多复合中心模型的预测。通过研究CsPbBr3量子点在高激发功率下的三电子态，讨论了闪烁机制.
Colloidal lead halide perovskite quantum dots, due to their optical versatility and facile solution processability, have been recently recognized as components of various optoelectronic devices. Detailed understanding of their exciton recombination dynamics at the single-particle level is necessary for utilizing their full potential. We conducted spectroscopic studies of the excitons and biexciton dynamics in single CsPbBr3perovskite quantum dots. It was found that while the rates of radiative recombination remain essentially constant, the overall relaxation process is dominated by nonradiative recombination of single excitons and biexcitons. The radiative lifetime scaling is determined to be ∼1.0 for single exciton and ∼4.4 for biexcitons. A linear dependence of fluorescence lifetime vs intensity distribution agrees well with the prediction of the model of multiple recombination centers. The blinking mechanism of CsPbBr3quantum dots is addressed by considering the trion states under higher excitation powers.