Ultra long-lived radiative trap states in CdSe quantum dots

Mohamed Abdellah; Khadga J. Karki; Nils Lenngren; Kaibo Zheng; Torbjörn Pascher; Arkady Yartsev; Tõnu Pullerits

doi:10.1021/jp506536h

Ultra long-lived radiative trap states in CdSe quantum dots

Mohamed Abdellah, Khadga J. Karki^*, Nils Lenngren, Kaibo Zheng, Torbjörn Pascher, Arkady Yartsev, Tõnu Pullerits

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

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.

Original language	English
Pages (from-to)	21682-21686
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	37
DOIs	https://doi.org/10.1021/jp506536h
State	Published - 18 Sep 2014
Externally published	Yes

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title = "Ultra long-lived radiative trap states in CdSe quantum dots",

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 = "Mohamed Abdellah and Karki, {Khadga J.} and Nils Lenngren and Kaibo Zheng and Torbj{\"o}rn Pascher and Arkady Yartsev and T{\~o}nu Pullerits",

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doi = "10.1021/jp506536h",

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T1 - Ultra long-lived radiative trap states in CdSe quantum dots

AU - Abdellah, Mohamed

AU - Karki, Khadga J.

AU - Lenngren, Nils

AU - Zheng, Kaibo

AU - Pascher, Torbjörn

AU - Yartsev, Arkady

AU - Pullerits, Tõnu

PY - 2014/9/18

Y1 - 2014/9/18

N2 - 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.

AB - 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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M3 - 文章

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VL - 118

SP - 21682

EP - 21686

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 37

ER -

Ultra long-lived radiative trap states in CdSe quantum dots

Abstract

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