Abstract
Lead-free bismuth-based perovskite halides are promising materials for optoelectronic applications owing to their lower toxicity, high absorption coefficient, and similar isoelectronic structure to (lead) Pb. Herein, we report the synthesis of Cs3Bi2Br9 perovskite quantum dots (QD) via a modified LARP method and have studied the structural and optical properties. In this study, the QD exhibits an interesting dual emission peak and a bright, unique cyan-green luminescence, with an improved photoluminescence quantum yield of 34%. Studies on Cs3Bi2Br9 QD have been reported earlier, but interestingly the origin of optical properties remains disputed and varies significantly from literature to literature. As a result of our analysis, we expect observed photoluminescence to arise from interconfigurational electronic transitions of Bi3+ ions, with an intense peak at 476 nm attributed to A-band emission and a broad emission at 498 nm attributed to emission from a lower energy level in bismuth ion. Hence, these QDs are suitable for various optoelectronic applications, such as light-emitting diodes (LEDs).
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Acknowledgements
One of the authors Aswathi K.V would like to acknowledge financial support received from Anna University as Anna centenary Research fellowship (ACRF) CFR/ACRF/20257991134/AR1, Dated: 02-01-2020. Authors would like to thank HORIBA- IISc Technical Centre, Bangalore, Dr. Sudeeksha HC for helping with PL lifetime measurements.
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The Funding was provided by Anna University, CFR/ACRF/20257991134/AR1, Dated: 02-01-2020
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Aswathi K V: Conceptualization, Methodology, Investigation, Visualization, Writing–Original Draft. Pandiyarajan: Methodology, Investigation, Visualization Shanthi Subashchandran: Supervision, Conceptualization, Methodology, Writing-Review & Editing.
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K. V, A., Subashchandran, S. & Mariyappan, P. Investigation on optical properties of lead-free Cs3Bi2Br9 perovskite derivative quantum dots synthesised via modified LARP method. Opt Quant Electron 56, 1044 (2024). https://doi.org/10.1007/s11082-024-06975-7
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DOI: https://doi.org/10.1007/s11082-024-06975-7