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Abstract
Lead toxicity has hindered the wide applications of lead halide perovskites in optoelec- tronics and bioimaging. A significant amount of effort has been made to synthesize lead-free halide perovskites as alternatives to lead halide perovskites. In this work, we demonstrate the feasibility of synthesizing CsSnI3-based powders mechanochemically with dual light emissions under ambi- ent conditions from CsI and SnI2 powders. The formed CsSnI3-based powders are divided into CsSnI3-dominated powders and CsSnI3-contained powders. Under the excitation of ultraviolet light of 365 nm in wavelength, the CsSnI3-dominated powders emit green light with a wavelength centered at 540 nm, and the CsSnI3-contained powders emit orange light with a wavelength centered at 608 nm. Both the CsSnI3-dominated and CsSnI3-contained powders exhibit infrared emission with the peak emission wavelengths centered at 916 nm and 925 nm, respectively, under a laser of 785 nm in wavelength. From the absorbance spectra, we obtain bandgaps of 2.32 eV and 2.08 eV for the CsSnI3-dominated and CsSnI3-contained powders, respectively. The CsSnI3-contained powders exhibit the characteristics of thermal quenching and photoelectrical response under white light.
Document Type
Article
Publication Date
7-2024
Digital Object Identifier (DOI)
https://doi.org/10.3390/ma17143577
Funding Information
This research is supported by NSF through the grant CBET-2018411 monitored by Nora F Savage.
Repository Citation
HUANG, XUAN; Tang, Xiaobing; Wen, Xiyu; Lu, Yuebin Charles; and Yang, Fuqian, "Dual Light Emission of CsSnI3-Based Powders Synthesized via a Mechanochemical Process" (2024). Chemical and Materials Engineering Faculty Publications. 103.
https://uknowledge.uky.edu/cme_facpub/103
Included in
Chemical Engineering Commons, Condensed Matter Physics Commons, Materials Science and Engineering Commons
Notes/Citation Information
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).