Spectral Dynamics and Multiphoton Absorption Properties of All-Inorganic Perovskite Nanorods

Junzi Li; Qiang Jing; Shuyu Xiao; Yang Gao; Yue Wang; Wenjing Zhang; Xiao Wei Sun; Kai Wang; Tingchao He

doi:10.1021/acs.jpclett.0c00967

Spectral Dynamics and Multiphoton Absorption Properties of All-Inorganic Perovskite Nanorods

J Phys Chem Lett. 2020 Jun 18;11(12):4817-4825. doi: 10.1021/acs.jpclett.0c00967. Epub 2020 Jun 8.

Authors

Junzi Li¹, Qiang Jing², Shuyu Xiao¹, Yang Gao¹, Yue Wang³, Wenjing Zhang⁴, Xiao Wei Sun², Kai Wang², Tingchao He¹

Affiliations

¹ College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R. China.
² Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, P. R China.
³ MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R China.
⁴ SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R China.

PMID: 32508096
DOI: 10.1021/acs.jpclett.0c00967

Abstract

All-inorganic perovskite (CsPbX₃, X = Cl, Br, I) nanorods (NRs) not only retain their inherent advantages such as a high photoluminescence quantum yield and broad wavelength tunability but also exhibit superior photophysical properties including their extremely strong multiphoton absorption (MPA). However, the spectral dynamics and MPA properties of CsPbX₃ NRs have not been fully investigated. Here, we report comprehensive comparison studies on the femtosecond spectral dynamical properties of CsPb(Br_0.8Cl_0.2)₃, CsPbBr₃, and CsPb(Br_0.85I_0.15)₃ NRs, including their influences on their hot-carrier cooling, biexciton lifetime, and biexciton binding energy. Interestingly, although the three kinds of perovskite NRs have similar diameters and lengths, they differ significantly in their nonlinear optical properties, among which the CsPb(Br_0.85I_0.15)₃ displayed the greatest MPA cross sections. Furthermore, the multiphoton-excited stimulated emission of CsPb(Br_0.8Cl_0.2)₃ and CsPbBr₃ NRs is demonstrated. This work indicates that CsPbX₃ (X = Cl, Br, I) NRs are excellent candidates for exploring their applications in different optoelectronic devices.