Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.074
Publication date: 22nd December 2022
Lead halide perovskite nanocrystals (LHP NCs) are an emerging class of light-emitting semiconductors owing to their remarkable optoelectronic properties such as their high photoluminescence quantum yield (PLQY), tunable emission across the visible spectrum emission, and facile synthesis. The optical properties of LHP NCs are not only tunable by their halide composition, but also through doping with metal cations. Generally, doping not only improves the stability of LHP NCs but also reduces Pb-related toxicity by replacing them with non-toxic dopants. Among all, Mn2+-doped LHP NCs have received significant interest to understand the exciton-to-dopant energy or electron transfer process.1-4 The Mn2+-doping in CsPbCl3 NCs results in the transfer of the exciton energy from CsPbCl3 to the dopants leading to orange emission from a spin-forbidden Mn d–d transition. However, the energy transfer efficiency not only depends on the amount of the dopant and band alignment of the dopants with respect to the excitons but also on the surface traps. In this presentation, I will discuss our findings on the enhanced exciton-to-dopant energy transfer by post-synthetic surface treatment with didodecyldimethylammonium chloride (DDAC), a tightly binding ligand. The DDAC ligands have the ability to replace the weakly bound oleyalammonium cations and reduce the density of chlorine vacancies on the surface, resulting in an increase in the PLQY of Mn2+ ions. Ultrafast time pump-probe studies and time-resolved luminescence of dopants revealed that the DDAC ligands remove the surface traps and thus promote energy transfer as well as reduce the quenching of Mn2+ emission by the surface traps.
L.P. acknowledges support from the Spanish Ministerio de Ciencia e Innovación through Ramón y Cajal grant (RYC2018-026103-I) and the Spanish State Research Agency (Grant PID2020-117371RA-I00) and a grant from the Xunta de Galicia (ED431F2021/05).
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