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Ultra Long-Lived Radiative Trap States in CdSe Quantum Dots

Qenawy, Mohamed LU ; Karki, Khadga Jung LU ; Lenngren, Nils LU ; Zheng, Kaibo LU ; Pascher, Torbjörn LU ; Yartsev, Arkady LU orcid and Pullerits, Tönu LU (2014) In Journal of Physical Chemistry C 118(37). p.21682-21686
Abstract
Surface states and traps play an important role in the photophysics of colloidal quantum dots. These states typically lead to large red-shifted photoluminescence. We have used steady-state and time-resolved spectroscopic techniques to investigate the nature of the traps and their lifetimes in colloidal CdSe quantum dots. We conclude that at least two different types of traps contribute to the photoluminescence. The trapping is more pronounced at higher excitation energies compared to the band edge excitation. Hole trapping is dominant in CdSe quantum dots. The time-resolved photoluminescence and pump–probe measurements show that the trapped holes live for longer than tens of microseconds at room temperature.
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
118
issue
37
pages
5 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000342118500042
  • scopus:84908608013
ISSN
1932-7447
DOI
10.1021/jp506536h
language
English
LU publication?
yes
additional info
Authors Mohamed Abdellah and Khadga Karki contributed equally to the article. The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
id
0277a20b-7a6a-4470-8c6a-b2eb7a4991ad (old id 4698005)
alternative location
http://pubs.acs.org/doi/abs/10.1021/jp506536h
date added to LUP
2016-04-01 10:08:40
date last changed
2021-09-01 01:12:41
@article{0277a20b-7a6a-4470-8c6a-b2eb7a4991ad,
  abstract     = {Surface states and traps play an important role in the photophysics of colloidal quantum dots. These states typically lead to large red-shifted photoluminescence. We have used steady-state and time-resolved spectroscopic techniques to investigate the nature of the traps and their lifetimes in colloidal CdSe quantum dots. We conclude that at least two different types of traps contribute to the photoluminescence. The trapping is more pronounced at higher excitation energies compared to the band edge excitation. Hole trapping is dominant in CdSe quantum dots. The time-resolved photoluminescence and pump–probe measurements show that the trapped holes live for longer than tens of microseconds at room temperature.},
  author       = {Qenawy, Mohamed and Karki, Khadga Jung and Lenngren, Nils and Zheng, Kaibo and Pascher, Torbjörn and Yartsev, Arkady and Pullerits, Tönu},
  issn         = {1932-7447},
  language     = {eng},
  number       = {37},
  pages        = {21682--21686},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Journal of Physical Chemistry C},
  title        = {Ultra Long-Lived Radiative Trap States in CdSe Quantum Dots},
  url          = {http://dx.doi.org/10.1021/jp506536h},
  doi          = {10.1021/jp506536h},
  volume       = {118},
  year         = {2014},
}