DOI: https://doi.org/10.29363/nanoge.incnc.2021.029
Publication date: 8th June 2021
All-inorganic perovskite nanocrystals (NCs) are emerging as a new class of materials with advanced optical properties, depending on both the fabrication techniques and the diverse strategies of surface passivation. In particular, due to their intrinsic sensitivity to the ambient conditions (often inducing critical fast optical irreversible quenching) the development of novel strategies for effective surface stabilization is a current challenge. On the other hand, some results in literature evidence the presence of reversible environmental effects on the emission properties, that could open the way for sensing applications (for instance, atmosphere composition/pressure), if properly engineered.
Here, we present a study on the Amplified Spontaneous Emission (ASE) properties of lecithin-capped CsPbBr3 NCs[1] and on their dependence on the environmental conditions. The NCs, deposited on quartz substrates and placed under two different air pressure (10-1 mbar and atmospheric pressure), have ASE threshold in line with the state of art for similar materials. We demonstrate a clear environmental sensitivity of ASE consisting in a reversible and reproducible variation of the intensity under vacuum and ambient conditions (up to 20 %), against a variation of a few percent observed for the spontaneous emission.
We explain our results by an air-induced ASE quenching, followed by a sort of signal restoring assigned to the peculiar role played by the lecithin-based surface passivation. These results suggest the possibility to exploit the ASE environmental dependence for the development of high sensitivity optical gas sensors.
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