Homo- and Heterovalent Doping-Mediated Self-Trapped Exciton Emission and Energy Transfer in Mn-Doped Cs2Na1- xAgxBiCl6 Double Perovskites

Bao Ke; Ruosheng Zeng; Zhuang Zhao; Qilin Wei; Xiaogang Xue; Kun Bai; Chunxiao Cai; Weichang Zhou; Zhiguo Xia; Bingsuo Zou

doi:10.1021/acs.jpclett.9b03387

Homo- and Heterovalent Doping-Mediated Self-Trapped Exciton Emission and Energy Transfer in Mn-Doped Cs₂Na_{1- x}Ag_xBiCl₆ Double Perovskites

J Phys Chem Lett. 2020 Jan 2;11(1):340-348. doi: 10.1021/acs.jpclett.9b03387. Epub 2019 Dec 24.

Authors

Bao Ke¹, Ruosheng Zeng^{1

2}, Zhuang Zhao³, Qilin Wei², Xiaogang Xue¹, Kun Bai¹, Chunxiao Cai⁴, Weichang Zhou³, Zhiguo Xia⁵, Bingsuo Zou²

Affiliations

¹ School of Materials Science and Engineering, School of Life and Environmental Sciences , Guilin University of Electronic Technology , Guilin 541004 , People's Republic of China.
² School of Physical Science and Technology, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials , Guangxi University , Nanning 530004 , People's Republic of China.
³ Synergetic Innovation Center for Quantum Effects and Application, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, School of Physics and Electronics , Hunan Normal University , Changsha 410081 , People's Republic of China.
⁴ Teaching Practice Department , Guilin University of Electronic Technology , Guilin 541004 , People's Republic of China.
⁵ State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials , South China University of Technology , Guangzhou 510641 , People's Republic of China.

PMID: 31849228
DOI: 10.1021/acs.jpclett.9b03387

Abstract

Double perovskites exhibit low toxicity, intrinsic thermodynamic stability, and small carrier effective mass. Herein, a novel doping route was adopted to incorporate Mn ions into Cs₂Na_1-xAg_xBiCl₆ double perovskites for engineering the band gap and tailoring the energy transfer. The as-prepared Cs₂Na_1-xAg_xBiCl₆ (0 < x < 1) exhibited excellent photoluminescence and a broad self-trapped exciton (STE) band from 500 to 900 nm, which exhibited an abnormal emission peak blue shift with increasing temperature. For Mn-doped Cs₂Na_1-xAg_xBiCl₆, the two photoluminescence (PL) bands from d-d transition emission of Mn ions and STEs were always observed simultaneously in the PL window. The distinct energy-transfer channel from the Mn²⁺ ion guest to the double-perovskite host resulted in the dominant Mn²⁺ emission. Our results will be helpful for further understanding the nature of the photophysics of double perovskites.