Abstract
CsPbBr3 nanocrystals (NCs) due to their extraordinary photoluminescence quantum yield and photostability without any inorganic passivation (core–shell) are probable candidates for LED and LASER applications. Additionally, the polarized luminescence of these NCs in ensemble broadens the field of applications, especially in liquid crystal display. Here, we report structural distortions and polarized emission from CsPbBr3 nanocubes with varying sizes of NCs. The change in Br–Pb and Br–Cs bond lengths with decreasing size of QDs reveals secrete of unprecedented increase in degree of emission polarization. The observed degree of polarization in this study is the highest reported value so far for lead halide perovskite structures in ensemble form without any additional alignment process. Different experimental configurations are used to study the transition dipole moments of CsPbBr3 NCs, which suggests that the transition dipole moments of absorption and emission are non collinear.
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Acknowledgements
The financial support from Department of Science and Technology Nanomission, New Delhi is thankfully acknowledged. A.S. thanks Savitribai Phule Pune University, Pune, India and Women Scientist Scheme (SR/WOS-A/PM-60/2017 (G)), Department of ScienST, and CSIR New Delhi, India for financial support. R.G. thanks UGC, New Delhi, India for Dr. D. S. Kothari Postdoctoral Scheme. Thanks to Amruta Lohar, Nidhi Tiwari and S. N. Jha for EXAFS measurements at RRCAT, Indore, India.
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Shinde, A., Gahlaut, R., Abharana, N. et al. Implications of the size variation on the local structure and polarized emission of CsPbBr3 quantum dots. J Mater Sci 56, 6977–6986 (2021). https://doi.org/10.1007/s10853-020-05712-1
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DOI: https://doi.org/10.1007/s10853-020-05712-1