DOI: https://doi.org/10.29363/nanoge.emlem.2023.003
Publication date: 18th August 2023
Lead-free perovskite nanocrystals are of interest due to their nontoxicity and potential application in the display industry. However, engineering their optical properties is nontrivial and demands an understanding of emission from both self-trapped and free excitons. Here, we focus on tuning silver-based double perovskite nanocrystals' optical properties via two iso-valent dopants, Bi and Sb. The photoluminescence quantum yield of the intrinsic Cs2Ag1-yNayInCl6 perovskite increases dramatically upon doping. However, the two dopants affect the optical properties very differently. We hypothesize that the differences arise from their differences in electronic level contributions and ionic sizes. This hypothesis is validated through absorption and temperature dependence photoluminescence measurements, namely by employing the Haung-Rhys factor, which indicates the coupling of the exciton to the lattice environment. Synchrotron measurements reveal the microstaining different effects of the two sizes of dopants, demonstrating that the octahedral tilting is larger in the case of Bi due to its size. These differences make Sb more sensitive to doping concentration (optimum ~10%) and sodium allowing (optimum ~100%). Such understanding is important for the engineering of optical properties in double perovskite, especially in light of recent achievements in boosting the photoluminescence quantum yield.
Special thanks to Prof. Boaz Pokroy for the synchrotron XRD measurements and analysis. We thank the EuroTech alliance research project for the opportunity to expand our collaborative research, the Nancy and Stephen Grand Technion Energy Program for their generous support, the Technion Russel Berrie Nanotechnology Institute, and of the Technion Helen Diller quantum center.
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