DOI: https://doi.org/10.29363/nanoge.emlem.2022.020
Publication date: 15th July 2022
Lead halide perovskites are intriguing candidates for the display industry. Lead-free perovskites are of interest due to their nontoxicity. However, engineering their optical properties is still in its infancy.
Controlling the optical properties is a fundamental goal for improving device performances. Here, we focus on tuning the optical properties of silver-based double perovskite nanocrystals via two iso-valent dopants, Bi and Sb. The PL quantum yield of the intrinsic Cs2Ag1-yNayInCl6 perovskite increases dramatically upon doping. The two dopants affect the optical properties differently. We hypothesize that this effect is related to exciton-phonon coupling in double perovskites. The mechanism allows broad white light emission wavelength and no overlap between the absorption and the emission, which is compatible with luminescent solar concentrators. Luminescent solar concentrators are light-harvesting devices that redirect the light to a photovoltaic cell. We test the exciton-phonon coupling through absorption and photoluminescence measurements using the Haung-Rhys factor calculation. Using colloidal open-air synthesis, we control the perovskite matrix and the doping concentration. We can differentiate between contributions from Bi and Sb levels marking different electronic considerations. This exemplifies the essence of the resulting practices for tuning and optimizing the optical properties of double perovskite nanocrystals.
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