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Title: Luminescence Decay of Colloidal Quantum Dots and Stretched Exponential (Kohlrausch) Relaxation Function

Abstract

The room temperature non-exponential luminescence decay of colloidal quantum dots is investigated theoretically in an attempt to identify the underlying physical mechanisms responsible for the shape of the decay. It is shown that a stretched exponential functional form of the luminescence decay can be understood in terms of long-range resonance energy transfer from quantum dots to acceptors (molecules, quantum dots, or anharmonic molecular vibrations) or by contact quenching by quenchers (surface traps, molecules or quantum dots) distributed statistically (Poisson distribution) on the surface of the dots. These non-radiative transition processes are assigned to different ranges of the stretching parameter β.

Authors:
 [1];  [2]
  1. Emperor Alexander I St. Petersburg State Transport University, Department of Physics (Russian Federation)
  2. ITMO University, International Research and Education Centre for Physics of Nanostructures (Russian Federation)
Publication Date:
OSTI Identifier:
22749959
Resource Type:
Journal Article
Journal Name:
Semiconductors
Additional Journal Information:
Journal Volume: 52; Journal Issue: 5; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7826
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DECAY; ENERGY TRANSFER; LUMINESCENCE; QUANTUM DOTS; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Bodunov, E. N., E-mail: evgeny.bodunov@inbox.ru, and Simões Gamboa, A. L. Luminescence Decay of Colloidal Quantum Dots and Stretched Exponential (Kohlrausch) Relaxation Function. United States: N. p., 2018. Web. doi:10.1134/S1063782618050044.
Bodunov, E. N., E-mail: evgeny.bodunov@inbox.ru, & Simões Gamboa, A. L. Luminescence Decay of Colloidal Quantum Dots and Stretched Exponential (Kohlrausch) Relaxation Function. United States. doi:10.1134/S1063782618050044.
Bodunov, E. N., E-mail: evgeny.bodunov@inbox.ru, and Simões Gamboa, A. L. Tue . "Luminescence Decay of Colloidal Quantum Dots and Stretched Exponential (Kohlrausch) Relaxation Function". United States. doi:10.1134/S1063782618050044.
@article{osti_22749959,
title = {Luminescence Decay of Colloidal Quantum Dots and Stretched Exponential (Kohlrausch) Relaxation Function},
author = {Bodunov, E. N., E-mail: evgeny.bodunov@inbox.ru and Simões Gamboa, A. L.},
abstractNote = {The room temperature non-exponential luminescence decay of colloidal quantum dots is investigated theoretically in an attempt to identify the underlying physical mechanisms responsible for the shape of the decay. It is shown that a stretched exponential functional form of the luminescence decay can be understood in terms of long-range resonance energy transfer from quantum dots to acceptors (molecules, quantum dots, or anharmonic molecular vibrations) or by contact quenching by quenchers (surface traps, molecules or quantum dots) distributed statistically (Poisson distribution) on the surface of the dots. These non-radiative transition processes are assigned to different ranges of the stretching parameter β.},
doi = {10.1134/S1063782618050044},
journal = {Semiconductors},
issn = {1063-7826},
number = 5,
volume = 52,
place = {United States},
year = {2018},
month = {5}
}