Publication date: 28th August 2024
Energy-harvesting materials are currently on the rise, as solar energy provides the Earth with a considerable amount of energy.[1] Designing hybrids that harness the synergistic power of both systems is of great significance in such a context. Hence, the use of nanohybrids based on perovskite nanocrystals and photoactive organic molecules such as BODIPY dyes triggers the properties of wide and strong light absorption in the visible range and the generation of reactive species such as triplet excited states, respectively, which could potentially be used for organic photocatalysis.[2] In this contribution, we investigated the photophysical properties of nanocrystal-organic nanohybrids at the interface. For this end, CsPbBr3 perovskite nanocrystals (NCs) have been merged with BODIPY dyes, specifically 8-(4-carboxyphenyl)-1,3,5,7-tetramethyl-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BDP) and 8-(4-carboxyphenyl)-2,6-diiodo-1,3,5,7-tetramethyl-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (I2-BDP). Through the use of steady-state and time-resolved absorption and photoluminescence techniques, we unveiled the sensitization mechanism of BODIPY dyes in the corresponding nanohybrids by selective excitation of the NCs. Spectroelectrochemical analysis and theoretical calculations confirm the generation of transient intermediate species, which are found to be crucial in the photosensitization mechanism. The efficient generation of triplet reactive species in I2-BDP allows the NC@I2-BDP nanohybrid to be used as a potential photocatalyst for the oxidation of α-terpinene to ascaridole via singlet oxygen formation.[3]
C.-V, A. thanks the “Maria de Maeztu” Programme (CEX 2019-000919-M) for a predoctoral fellowship (PRE2018-084294). Financial support by Generalitat Valenciana (CIPROM/2022/57). This work has also received support from Laserlab-Europe (EU-H2020 871124).
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