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Non-radiative relaxation processes in luminescence of InP/ZnS quantum dots

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, , Citation S S Savchenko et al 2020 J. Phys.: Conf. Ser. 1537 012015 DOI 10.1088/1742-6596/1537/1/012015

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s.s.savchenko@urfu.ru

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1 NANOTECH Centre, Ural Federal University, 19 Mira str., Ekaterinburg 620002, Russia

2 Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences, 101 Amundsen str., Ekaterinburg 620016, Russia

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1742-6596/1537/1/012015

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.

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10.1088/1742-6596/1537/1/012015