Abstract
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.
Highlights
Colloidal indium phosphide-based nanocrystals are environmentally friendly material with tunable optical properties due to a quantum confinement effect
Activation energies of 130 and 119 meV in quantum dots (QDs)-1 and QD-2, correspondingly, for the exciton band can be assigned to the bright-bright splitting of the exciton fine structure
Photoluminescence was studied for two ensembles of InP/ZnS core/shell QDs with average particle diameters of 4.2 (QD-1) and 4.6 (QD-2) nm estimated from the position of the first exciton absorption band [5]
Summary
Colloidal indium phosphide-based nanocrystals are environmentally friendly material with tunable optical properties due to a quantum confinement effect. 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.
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