Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.191
Publication date: 16th December 2024
In this work, we analyse the photoemission of lead halide perovskite quantum dots synthesized within nanoporous metal oxide films with either electron scavenging (such as TiO2) or electron blocking (SiO₂) properties as a function of the excitation power density. In good agreement with previous reports [1-3], at low excitation fluences, scaffolds that facilitate charge extraction from the perovskite electronic bands, such of TiO2, give rise to a lower emission intensity and quantum yield (QY) with respect to more insulating ones like SiO2. Counterintuitively, the situation reverses under higher irradiation fluences, for which electron scavenging scaffolds favours a highly intense amplified spontaneous emission (ASE) from perovskite quantum dots. This effect is understood by analysing the interplay between the efficiency of carrier transfer to the matrix and the different electronic processes occurring at each irradiation stage, i.e., trap-assisted and band-to-band recombination at lower and intermediate fluences, and the competition between Auger recombination and population inversion at higher ones. These findings open the path to develop highly efficient light emitting perovskite QD films, leading future progress for their potential application in advanced photonic devices.
This project has received funding from the Spanish Ministry of Science and Innovation under grant PID2020-116593RB-I00, funded by MCIN/AEI/10.13039/501100011033.
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