Highly Efficient Self-Trapped Exciton Emission of a (MA)<sub>4</sub>Cu<sub>2</sub>Br<sub>6</sub> Single Crystal

Hui Peng(Beijing Institute of Technology), Shangfei Yao(Guangxi University), Yongchang Guo(Beijing Institute of Technology), Ruonan Zhi(Beijing Institute of Technology), Xinxin Wang(Beijing Institute of Technology), Fujian Ge(Beijing Institute of Technology), Ye Tian(Beijing Institute of Technology), Jianping Wang(Chinese Academy of Sciences), Bingsuo Zou(Beijing Institute of Technology)
The Journal of Physical Chemistry Letters
May 8, 2020
10.1021/acs.jpclett.0c01162
Cited by 220

Abstract

was proven by density functional theory calculation, and its band gap was determined by experiments to be ∼3.87 eV. In the temperature range of 98-258 K, the PL intensity increases gradually with an increase in temperature due to the deep trapping out of strong electro-phonon coupling, while the PL decreases when the temperature increases over 258 K due to phonon scattering. It is worth mentioning that this new material has high chemical and light stability, in contrast to the lead perovskite.

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