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Red Shift of Bleaching Signals in Femtosecond Transient Absorption Spectra of CsPbX3 (X = Cl/Br, Br, Br/I) Nanocrystals Induced by the Biexciton Effect
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-02-25 , DOI: 10.1021/acs.jpcc.0c08995 Xiong Shen 1 , Song Wang 2 , Chuang Geng 1 , Liting Li 1 , Ercui Zhao 1 , Jianhui Sun 1 , Wenzhi Wu 3 , Limin An 1 , Kai Pan 2
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-02-25 , DOI: 10.1021/acs.jpcc.0c08995 Xiong Shen 1 , Song Wang 2 , Chuang Geng 1 , Liting Li 1 , Ercui Zhao 1 , Jianhui Sun 1 , Wenzhi Wu 3 , Limin An 1 , Kai Pan 2
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Metal halide perovskites are affected by the quantum effect, their size is equal to the Bohr radius of the material, and they exhibit excellent emission performance and charge-transfer performance. We have synthesized CsPbX3 (X = Cl/Br, Br, Br/I) monodisperse nanocrystals (NCs) by a simple heat injection method. The band gap energy and emission wavelength can be changed by adjusting the composition of nanocrystals. CsPbX3 NCs have an emission linewidth of 18–29 nm, a photoluminescence lifetime of 5.7–20.8 ns, and a fast carrier-transfer rate. In this paper, the transient absorption (TA) spectra of CsPbX3 NCs were studied by a femtosecond laser. The carrier dynamics is studied by changing the excitation power and delay time. The experimental results show that the bleaching signal of the TA spectrum has a red shift of 5–12 nm initially and then remains unchanged. With an increase of excitation power, the bleaching signal also shows obvious fast decay components, indicating the emergence of biexciton states. In the TA spectrum, the corresponding wavelengths are obtained from the bleaching signals of single and biexciton states, and then, the binding energy of biexciton in the range of 21.7–61.2 meV is calculated according to the optical quantum energy formula.
中文翻译：
双激子效应引起的CsPbX 3（X = Cl / Br，Br，Br / I）纳米晶体飞秒瞬态吸收光谱中的漂白信号红移
金属卤化物钙钛矿受量子效应的影响，其尺寸等于材料的玻尔半径，并且具有出色的发射性能和电荷转移性能。我们已经通过简单的热注射方法合成了CsPbX 3（X = Cl / Br，Br，Br / I）单分散纳米晶体（NCs）。带隙能量和发射波长可以通过调节纳米晶体的组成来改变。CsPbX 3 NC具有18–29 nm的发射线宽，5.7–20.8 ns的光致发光寿命以及快速的载流子传输速率。本文介绍了CsPbX 3的瞬态吸收（TA）光谱NC是通过飞秒激光进行研究的。通过改变激励功率和延迟时间来研究载流子动力学。实验结果表明，TA光谱的漂白信号最初具有5–12 nm的红移，然后保持不变。随着激发功率的增加，漂白信号还显示出明显的快速衰减分量，表明出现了双激态。在TA光谱中，从单态和双激子态的漂白信号获得相应的波长，然后根据光量子能公式计算出21.7–61.2 meV范围内的双激子结合能。
更新日期：2021-03-11
中文翻译：
双激子效应引起的CsPbX 3（X = Cl / Br，Br，Br / I）纳米晶体飞秒瞬态吸收光谱中的漂白信号红移
金属卤化物钙钛矿受量子效应的影响，其尺寸等于材料的玻尔半径，并且具有出色的发射性能和电荷转移性能。我们已经通过简单的热注射方法合成了CsPbX 3（X = Cl / Br，Br，Br / I）单分散纳米晶体（NCs）。带隙能量和发射波长可以通过调节纳米晶体的组成来改变。CsPbX 3 NC具有18–29 nm的发射线宽，5.7–20.8 ns的光致发光寿命以及快速的载流子传输速率。本文介绍了CsPbX 3的瞬态吸收（TA）光谱NC是通过飞秒激光进行研究的。通过改变激励功率和延迟时间来研究载流子动力学。实验结果表明，TA光谱的漂白信号最初具有5–12 nm的红移，然后保持不变。随着激发功率的增加，漂白信号还显示出明显的快速衰减分量，表明出现了双激态。在TA光谱中，从单态和双激子态的漂白信号获得相应的波长，然后根据光量子能公式计算出21.7–61.2 meV范围内的双激子结合能。
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