Efficient and sub-nanosecond resonance energy transfer in close-packed films of ZnSe quantum dots by steady-state and time-resolved spectroscopy
| Autor: | M.S. Brodyn, T. G. Beynik, N. A. Matveevskaya, N. V. Bondar |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Photoluminescence Materials science Condensed Matter::Other Exciton Physics::Optics Resonance 02 engineering and technology Nanosecond Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Molecular physics Condensed Matter::Materials Science Quantum dot 0103 physical sciences Molecule General Materials Science Electrical and Electronic Engineering Time-resolved spectroscopy 0210 nano-technology Spectroscopy |
| Zdroj: | Superlattices and Microstructures. 138:106382 |
| ISSN: | 0749-6036 |
| Popis: | Quantum dots (QDs) structures have the large potential to provide new optico-electrical properties through energy transfer from small-sized QDs to large one. We study the energy transfer process and an influence of ligand on interior states QDs in ZnSe QDs films stabilized by thioglycerol. By combining a steady-state and time resolved photoluminescence spectroscopy measurements we demonstrated the high energy transfer efficiency and its effect on optical properties of random loose-packed QDs arrays. First shown that in ZnSe QDs films the energy transfer time constant can be as fast as 750 ps that is governed by the minimal inter-QDs distance (small length of the thioglycerol molecules) and strong excitons quantum confinement. We discussed also possible causes of an occurrence the so-called blocking QDs in arrays limiting the exciton transport length and energy transfer processes. |
| Databáze: | OpenAIRE |
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