Publication date: 3rd July 2020
Recently, a growing interest has been devoted to the synthesis and organization of nanostructured materials, Intensive research has focused on the fabrication of QDs based organized hybrid structures in solid-state, which have shown new properties due to the collective interactions of nanoparticles or at the interface with molecular dyes. In particular, QDs with controlled size and shape coupled and/or functionalized with suitable organic chromophores demonstrated efficient energy transfer (ET) and processes [1]. The aim of this work is the fabrication of a high FRET efficiency system, both in solution and in solid-state, formed by colloidal CdSe QDs and fluorescent Bodipy dyes. Careful engineering of the systems is required to minimize the distance between the organic and inorganic fluorophores for promoting effective energy transfers both in solution and in solid-state. In this perspective, dyes bearing amino terminated groups are properly designed in virtue of the high affinity of such functionalities in coordinating the QD surface. Monoaminostyryl substituted BODIPY (MASB), with an amino moiety, and diaminostyryl functionalized BODIPY (DASB), a bidentate dye bearing two amino groups, are selected as acceptors in the FRET systems with respect to the donors CdSe QDs. A pre-functionalization procedure of the QDs surface with a short amine ligand demonstrates to favor the interaction with the organic fluorophores in solution. The coupled hybrid system with MASB shows a very short donor-acceptor distance and an effective energy transfer already in solution, with an efficiency of 76%. The efficiency further enhances up in solid state when the fluorophores are deposited as single coordinated units from solution, demonstrating the effectiveness of the coupling strategy. The overall results demonstrate the effectiveness of the tight coupling of the dye at the QD surface in obtaining a FRET system with high efficiency both in solution and in solid-state, which can be successfully employed in sensor devices. In addition, the very short distance between donor and acceptor can promote the investigation of possible coherent effects in the energy transfer process involving the two fluorophores.
This work is financially supported by the Italian MIUR PRIN project 2015 n. 2015XBZ5YA . The H2020 FET project COPAC (Contract agreement n.766563) is also acknowledged.
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