Luminescence Decay of Colloidal Quantum Dots and Stretched Exponential (Kohlrausch) Relaxation Function
- Authors: Bodunov E.N.1, Simões Gamboa A.L.2
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Affiliations:
- Department of Physics
- International Research and Education Centre for Physics of Nanostructures
- Issue: Vol 52, No 5 (2018)
- Pages: 587-589
- Section: XXV International Symposium “Nanostructures: Physics and Technology”, Saint Petersburg, Russia, June 26–30, 2017. Nanostructure Characterization
- URL: https://journals.rcsi.science/1063-7826/article/view/203082
- DOI: https://doi.org/10.1134/S1063782618050044
- ID: 203082
Cite item
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.
About the authors
E. N. Bodunov
Department of Physics
Author for correspondence.
Email: evgeny.bodunov@inbox.ru
Russian Federation, St. Petersburg, 190031
A. L. Simões Gamboa
International Research and Education Centre for Physics of Nanostructures
Email: evgeny.bodunov@inbox.ru
Russian Federation, St. Petersburg, 197101