Abstract
Hybrid thin films that combine organic conjugated molecules and semiconductors nanocrystals (NCs) have been deeply investigated in the previous years, due to their capability to provide an extremely broad tuning of their electronic and optical properties. In this paper we review the main aspects of the basic physics of the organic–inorganic interaction and the actual state of the art of lasers and light emitting diodes based on hybrid active materials.
Highlights
The need for active materials for photonic, optoelectronic and electronic devices with improved performances strongly stimulates the research on innovative materials with semiconducting properties, able to provide advantages with respect to standard inorganic semiconductors in terms of realization costs, active properties engineering and absolute performances
For example light emission fully tunable in the visible–near infrared (VIS-NIR) range has been demonstrated in many classes of molecules by controlling the electron wavefunction delocalization along the molecule acting on the molecule chemical structure [1]
The details of Förster resonant energy transfer (FRET) from a conjugated polymer to a NC was later investigated by time resolved photoluminescence spectroscopy by Anni et al [35] in thin films of a blend between a blue-emitting polymer, namely poly[(9,9-dihexylfluorenyl-2,7-diyl)-alt-co-(9,ethyl-3,6-carbazole)] (PDFC), and colloidal CdSe/ZnS core–shell quantum dots
Summary
The need for active materials for photonic, optoelectronic and electronic devices with improved performances strongly stimulates the research on innovative materials with semiconducting properties, able to provide advantages with respect to standard inorganic semiconductors in terms of realization costs, active properties engineering and absolute performances In this very broad field, particular attention has been devoted in the last two decades to conjugated organic molecules, both oligomers and polymers and to semiconductor nanocrystals (NCs). Conjugated molecules are characterized by a combination of the processability and low costs typical of plastic materials with active properties, like charge mobility, luminescence and optical gain, typical of semiconductors They show a strong dependence of the electronic properties on the molecular chemical structure, that allows us to widely tune their properties by properly engineer the molecular backbone. We will present the possible development perspectives of hybrid active materials
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