Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.234
Publication date: 16th December 2024
The synthesis of ABX3 quantum dots (QD) using a mesoporous material with a narrow pore size distribution is a preparation method that has gained interest in recent years due to the ease of processing and the excellent optical properties of the QDs obtained in the pore network.[1] These ligand-free QDs also present a pristine surface that is suitable for interacting with the surrounding atmosphere. In this work, we have synthesized CsPbBr3 QDs within the pore network of high optical quality SiO2 porous films. We analyzed the variation of the QDs luminescence response under the gradual exposure to vapors, since the mesostructure of the matrix determines the rate at which vapor molecules will adsorb onto the pore walls and eventually condensate, filling the void space.[2] These results open the route to apply ABX3 QDs in base materials for sensing. On the other hand, the aforementioned control of the water adsorption allowed us to obtain an intense and enduring blue emission (470-480 nm), with a photoluminescence quantum yield (PLQY) of 40% when Cs4PbBr6 was previously embedded in SiO2 porous matrix.[3] This blue emission originates from very small CsPbBr3 nanocrystals (diameter<3nm) formed by the controlled exposure of Cs4PbBr6 to humidity.
PID2020-116593RB-I00, funded by MCIN/AEI/10.13039/501100011033
PID2023-149344OB-I00, funded by MCIN/AEI/
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