Proceedings of Online school on Fundamentals of Semiconductive Quantum Dots (QDsSCHOOL)
DOI: https://doi.org/10.29363/nanoge.qdsschool.2021.023
Publication date: 30th April 2021
Lead halide perovskite nanocrystals (PNCs) have garnered much attention from the scientific community due to their near-unity fluorescence quantum yield, tunable size, bandgap, versatile morphology, thermal and photo-stability, etc. PNCs have a wide range of applications such as photovoltaics, light-emitting diodes, sensing, catalysis, etc. Herein, we have synthesized stable and highly fluorescent cesium lead bromide (CsPbBr3) PNCs and cesium lead chloride (CsPbCl3) PNCs at room temperature under ambient conditions. With the use of steady-state and time-resolved absorption and emission techniques, we have identified the existence of fluorescence resonance energy transfer between these two PNCs and CdSe/ZnS core/shell quantum dots (QDs). It shows that with the addition of QDs into the donor CsPbBr3 and CsPbCl3 PNCs solution, there is a sequential drop in the fluorescence intensity as well as an average lifetime with a simultaneous increase in these values for QDs, which ensures the presence of FRET in such systems. The FRET efficiency is found to be higher in case of CsPbBr3 PNCs (84.4 %) as compared to CsPbCl3 (04.5 %). These upshots can be used in potential and efficient solar cell applications.
References.
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Perovskite Nanocrystal Heterostructures: Synthesis, Optical Properties, and Applications S. Bera and N Pradhan* ACS Energy Lett. 2020, 5, 9, 2858–2872
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