Optical Properties of a CsMnBr3 Single Crystal

Yingzhuang Xu; Junzi Li; Fuli Zhao; Yang Gao; Rui Chen; Tingchao He

doi:10.1021/acsomega.2c03661

Optical Properties of a CsMnBr₃ Single Crystal

ACS Omega. 2022 Aug 10;7(33):29415-29419. doi: 10.1021/acsomega.2c03661. eCollection 2022 Aug 23.

Authors

Yingzhuang Xu¹, Junzi Li¹, Fuli Zhao², Yang Gao¹, Rui Chen², Tingchao He¹

Affiliations

¹ Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
² Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055 P. R. China.

Abstract

Lead-free perovskite materials with good stability are promising for various applications. In order to explore their application in optoelectronic devices, it is essential to investigate their fundamental optical properties. In this work, we have synthesized a CsMnBr₃ single crystal (SC) with red emission at ∼621 nm and studied their optical properties. Through the measurement of temperature-dependent photoluminescence (PL) spectra, it is found that a phase transition occurs at approximately 100 K in the SC, which is absent in the CsMnBr₃ nanocrystals (NCs). Furthermore, the SC exhibits stronger electron and longitudinal optical phonon coupling strength than that of the NCs at low temperatures. In addition, under the resonant excitation at 600 nm, the SC possesses strong saturable absorption property, with a modulation depth of ∼27%. Interestingly, the SC also exhibits a large two-photon absorption coefficient of ∼0.035 cm GW^-1 at 800 nm and an excellent optical limiting behavior. The experimental results indicate that the CsMnBr₃ SC is a class of excellent environmentally friendly optoelectronic materials.