Non-radiative relaxation processes in luminescence of InP/ZnS quantum dots
| Autor: | Alexander Vokhmintsev, Ilya Weinstein, S. S. Savchenko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
History
Photoluminescence Materials science Exciton SEMICONDUCTING INDIUM PHOSPHIDE III-V SEMICONDUCTORS CORE/SHELL NANOCRYSTALS EMISSION BANDS Molecular physics Education Condensed Matter::Materials Science INDIUM PHOSPHIDE Radiative transfer THERMAL QUENCHING EXCITONS EXCITON FINE STRUCTURE Relaxation (NMR) ACTIVATION ENERGY NANOSTRUCTURED MATERIALS Atmospheric temperature range Condensed Matter::Mesoscopic Systems and Quantum Hall Effect TEMPERATURE BEHAVIOR Computer Science Applications NANOCRYSTALS Nanocrystal Quantum dot INHOMOGENEOUS BROADENING TEMPERATURE RANGE NON-RADIATIVE RELAXATION Luminescence SEMICONDUCTOR QUANTUM DOTS QUENCHING |
| Zdroj: | Journal of Physics: Conference Series |
| DOI: | 10.1088/1742-6596/1537/1/012015/pdf |
| Popis: | Photoluminescence (PL) thermal quenching of InP/ZnS core/shell nanocrystals of 4.2 (QD-1) and 4.6 (QD-2) nm in diameter is investigated in the temperature range of 6.5-296 K. Observed PL spectra are found to originate from exciton and defect-related transitions. Temperature behavior of the emission bands indicates effects of inhomogeneous broadening due to distributions of quantum dots parameters in the ensembles. PL thermal quenching analysis unveils two non-radiative relaxation channels for each band in both samples. Activation energies of 130 and 119 meV in QD-1 and QD-2, correspondingly, for the exciton band can be assigned to the bright-bright splitting of the exciton fine structure. © Published under licence by IOP Publishing Ltd. Departamento Administrativo de Ciencia, TecnologÃa e Innovación (COLCIENCIAS): 727-2015 Departamento Administrativo de Ciencia, TecnologÃa e Innovación (COLCIENCIAS) We gratefully acknowledge the financial support received from the Departamento Administrativo de Ciencia, Tecnología e Innovación, Colciencias, Colombia, through Convocatoria No. 727-2015. The authors would also like to thank the administrative support received from the Centro de Investigación para el Desarrollo y la Innovación (CIDI) of the Universidad Pontificia Bolivariana. |
| Databáze: | OpenAIRE |
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