Room-temperature efficient photoluminescence mechanism of indium doping lead-free colloidal MA3Bi2Br9 quantum dots solution

Ya Chu; Yurong Guo; Guangjiu Zhao

doi:10.1016/j.saa.2023.123010

Room-temperature efficient photoluminescence mechanism of indium doping lead-free colloidal MA₃Bi₂Br₉ quantum dots solution

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Dec 15:303:123010. doi: 10.1016/j.saa.2023.123010. Epub 2023 Jun 12.

Authors

Ya Chu¹, Yurong Guo², Guangjiu Zhao³

Affiliations

¹ School of Physics Science and Information Technology, Liaocheng University, Liaocheng 252059, China. Electronic address: chuya@lcu.edu.cn.
² Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, National Demonstration Center for Experimental Chemistry & Chemical Engineering Education, National Virtual Simulation Experimental Teaching Center for Chemistry & Chemical Engineering Education, School of Science, Tianjin University, Tianjin 300354, China.
³ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, National Demonstration Center for Experimental Chemistry & Chemical Engineering Education, National Virtual Simulation Experimental Teaching Center for Chemistry & Chemical Engineering Education, School of Science, Tianjin University, Tianjin 300354, China. Electronic address: gjzhao@tju.edu.cn.

PMID: 37478710
DOI: 10.1016/j.saa.2023.123010

Abstract

Lead halide perovskite quantum dots (QDs) are promising candidates for future optoelectronic devices due to their excellent photonic and electronic properties. However, poor stability and toxicity problems limit their further development. This work demonstrates the doping tactics to boost the optical properties of lead-free colloidal MA₃Bi₂Br₉ QDs, the indium ion (In³⁺) doping presented herein is found to be effective in improving the photoluminescence (PL) properties of MA₃Bi₂Br₉ (CH₃NH₂ = MA) QDs without alerting their favorable electronic structure. It has been elucidated by microscopy and diffraction results that the In³⁺ doping optimizes the QDs solution octahedron structure, and the PL red-shifted phenomenon coincides well with the analogous red-shifted obtained in the ultraviolet/visible (UV-Vis) absorption spectroscopy, which is due to the quantum confinement effect. And the nanosecond transient absorption (ns-TA) spectroscopy elucidates that the enhanced radiative recombination process contributes to enhanced stability and luminescence. The photoluminescence quantum yield (PLQY) of MA₃Bi₂Br₉ QDs is increased by 60.7%. This work offers a valid strategy for improving the quality of the lead-free perovskite QDs.

Keywords: Doping indium ions; Lead-free quantum dots; Stability; Transient absorption spectroscopy.