Picosecond time-resolved bleaching dynamics of self-assembled quantum dots

Erik W. Bogaart; Jos E.M. Haverkort; T. Mano; R. Nötzel; Joachim H. Wolter; P. Lever; H. H. Tan; C. Jagadish

doi:10.1109/TNANO.2004.828572

Picosecond time-resolved bleaching dynamics of self-assembled quantum dots

Erik W. Bogaart^*, Jos E.M. Haverkort, T. Mano, R. Nötzel, Joachim H. Wolter, P. Lever, H. H. Tan, C. Jagadish

^*Corresponding author for this work

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

7 Citations (Scopus)

Abstract

Picosecond bleaching dynamics of vertically stacked self-assembled quantum dots (QDs) is investigated by means of time-resolved pump-probe differential reflection spectroscopy (TRDR) at room temperature (RT). We observe that the absorption spectrum, which represents the QD density of states at RT, is strongly shifted with respect to the photoluminescence spectrum. This shift can not be interpreted by carrier emission and re-trapping alone. TRDR allows us to study the dynamics of the pump generated carriers within the QDs. From the time-resolved measurements, we detect that the bleaching decay time has a strong energy dependence and is dominated by radiative and nonradiative recombination at low energy and by carrier emission at high energy.

Original language	English
Pages (from-to)	348-352
Number of pages	5
Journal	IEEE Transactions on Nanotechnology
Volume	3
Issue number	3
DOIs	https://doi.org/10.1109/TNANO.2004.828572
Publication status	Published - Sept 2004

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title = "Picosecond time-resolved bleaching dynamics of self-assembled quantum dots",

abstract = "Picosecond bleaching dynamics of vertically stacked self-assembled quantum dots (QDs) is investigated by means of time-resolved pump-probe differential reflection spectroscopy (TRDR) at room temperature (RT). We observe that the absorption spectrum, which represents the QD density of states at RT, is strongly shifted with respect to the photoluminescence spectrum. This shift can not be interpreted by carrier emission and re-trapping alone. TRDR allows us to study the dynamics of the pump generated carriers within the QDs. From the time-resolved measurements, we detect that the bleaching decay time has a strong energy dependence and is dominated by radiative and nonradiative recombination at low energy and by carrier emission at high energy.",

keywords = "Bleaching, Dynamics, Quantum dots (QDs), Spectroscopy, Time resolved",

author = "Bogaart, {Erik W.} and Haverkort, {Jos E.M.} and T. Mano and R. N{\"o}tzel and Wolter, {Joachim H.} and P. Lever and Tan, {H. H.} and C. Jagadish",

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language = "English",

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TY - JOUR

T1 - Picosecond time-resolved bleaching dynamics of self-assembled quantum dots

AU - Bogaart, Erik W.

AU - Haverkort, Jos E.M.

AU - Mano, T.

AU - Nötzel, R.

AU - Wolter, Joachim H.

AU - Lever, P.

AU - Tan, H. H.

AU - Jagadish, C.

PY - 2004/9

Y1 - 2004/9

N2 - Picosecond bleaching dynamics of vertically stacked self-assembled quantum dots (QDs) is investigated by means of time-resolved pump-probe differential reflection spectroscopy (TRDR) at room temperature (RT). We observe that the absorption spectrum, which represents the QD density of states at RT, is strongly shifted with respect to the photoluminescence spectrum. This shift can not be interpreted by carrier emission and re-trapping alone. TRDR allows us to study the dynamics of the pump generated carriers within the QDs. From the time-resolved measurements, we detect that the bleaching decay time has a strong energy dependence and is dominated by radiative and nonradiative recombination at low energy and by carrier emission at high energy.

AB - Picosecond bleaching dynamics of vertically stacked self-assembled quantum dots (QDs) is investigated by means of time-resolved pump-probe differential reflection spectroscopy (TRDR) at room temperature (RT). We observe that the absorption spectrum, which represents the QD density of states at RT, is strongly shifted with respect to the photoluminescence spectrum. This shift can not be interpreted by carrier emission and re-trapping alone. TRDR allows us to study the dynamics of the pump generated carriers within the QDs. From the time-resolved measurements, we detect that the bleaching decay time has a strong energy dependence and is dominated by radiative and nonradiative recombination at low energy and by carrier emission at high energy.

KW - Bleaching

KW - Dynamics

KW - Quantum dots (QDs)

KW - Spectroscopy

KW - Time resolved

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U2 - 10.1109/TNANO.2004.828572

DO - 10.1109/TNANO.2004.828572

M3 - Article

SN - 1536-125X

VL - 3

SP - 348

EP - 352

JO - IEEE Transactions on Nanotechnology

JF - IEEE Transactions on Nanotechnology

IS - 3

ER -

Picosecond time-resolved bleaching dynamics of self-assembled quantum dots

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