Luminescence and Kinetic Properties of CdTe/SiO₂ Quantum Dots at Room and Cryogenic Temperatures

Abstract

The article investigates luminescence, kinetic, and colorimetric properties of colloidal semiconductor CdTe quantum dots coated with a SiO₂ shell at room and cryogenic temperatures. The photoluminescence spectrum reveals both excitonic transitions and transitions involving traps. When heated from cryogenic temperatures, it has been established that the luminescence bands shift to the red region and broaden, and temperature quenching occurs as well. In this case, the band associated with the trap-state luminescence is quenched almost completely. The temperature dependence of the bandgap of the quantum dots under study is due to a change in the position of the conduction band edge relative to the valence band edge, due to both thermal expansion of the lattice and interaction with phonons. It is assumed that broadening of the luminescence spectra with temperature may arise due to both exciton-phonon interaction and the presence of a contribution from structural defects at the CdTe/SiO₂ interface. The probable mechanism for the decrease in the integrated luminescence intensity with increasing temperature is assumed to be exciton dissociation and/or thermally activated charge carrier trapping by non-radiative recombination centers. It has been established that during continuous laser irradiation at liquid nitrogen temperature, the integrated photoluminescence intensity does not change in time. Quantitative analysis of the decay curves shows an acceleration of radiative relaxation of excited states with increasing temperature, which also confirms the assumption on the presence of thermally activated charge carrier trapping. An improvement in the colorimetric characteristics of photoluminescence of CdTe/SiO₂ quantum dots with increasing temperature is demonstrated

Please cite this article in English as:

Daibagya D.S. Luminescence and kinetic properties of CdTe/SiO₂ quantum dots at room and cryogenic temperatures. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2025, no. 2 (119), pp. 20--34 (in Russ.). EDN: IARFDK

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