Temperature dependence of the fundamental excitonic resonance in lead-salt quantum dots

Fangyu Yue; Jens W. Tomm; Detlef Kruschke; Bruno Ullrich; Junhao Chu

doi:10.1063/1.4926806

Temperature dependence of the fundamental excitonic resonance in lead-salt quantum dots

Fangyu Yue, Jens W. Tomm, Detlef Kruschke, Bruno Ullrich, Junhao Chu

School of Physics and Electronic Science

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

11 Scopus citations

Abstract

The temperature dependences of the fundamental excitonic resonance in PbS and PbSe quantum dots fabricated by various technologies are experimentally determined. Above ∼150 K, sub-linearities of the temperature shifts and halfwidths are observed. This behavior is analyzed within the existing standard models. Concordant modeling, however, becomes possible only within the frame of a three-level system that takes into account both bright and dark excitonic states as well as phonon-assisted carrier redistribution between these states. Our results show that luminescence characterization of lead-salt quantum dots necessarily requires both low temperatures and excitation densities in order to provide reliable ensemble parameters.

Original language	English
Article number	022106
Journal	Applied Physics Letters
Volume	107
Issue number	2
DOIs	https://doi.org/10.1063/1.4926806
State	Published - 13 Jul 2015

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title = "Temperature dependence of the fundamental excitonic resonance in lead-salt quantum dots",

abstract = "The temperature dependences of the fundamental excitonic resonance in PbS and PbSe quantum dots fabricated by various technologies are experimentally determined. Above ∼150 K, sub-linearities of the temperature shifts and halfwidths are observed. This behavior is analyzed within the existing standard models. Concordant modeling, however, becomes possible only within the frame of a three-level system that takes into account both bright and dark excitonic states as well as phonon-assisted carrier redistribution between these states. Our results show that luminescence characterization of lead-salt quantum dots necessarily requires both low temperatures and excitation densities in order to provide reliable ensemble parameters.",

author = "Fangyu Yue and Tomm, \{Jens W.\} and Detlef Kruschke and Bruno Ullrich and Junhao Chu",

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T1 - Temperature dependence of the fundamental excitonic resonance in lead-salt quantum dots

AU - Yue, Fangyu

AU - Tomm, Jens W.

AU - Kruschke, Detlef

AU - Ullrich, Bruno

AU - Chu, Junhao

PY - 2015/7/13

Y1 - 2015/7/13

N2 - The temperature dependences of the fundamental excitonic resonance in PbS and PbSe quantum dots fabricated by various technologies are experimentally determined. Above ∼150 K, sub-linearities of the temperature shifts and halfwidths are observed. This behavior is analyzed within the existing standard models. Concordant modeling, however, becomes possible only within the frame of a three-level system that takes into account both bright and dark excitonic states as well as phonon-assisted carrier redistribution between these states. Our results show that luminescence characterization of lead-salt quantum dots necessarily requires both low temperatures and excitation densities in order to provide reliable ensemble parameters.

AB - The temperature dependences of the fundamental excitonic resonance in PbS and PbSe quantum dots fabricated by various technologies are experimentally determined. Above ∼150 K, sub-linearities of the temperature shifts and halfwidths are observed. This behavior is analyzed within the existing standard models. Concordant modeling, however, becomes possible only within the frame of a three-level system that takes into account both bright and dark excitonic states as well as phonon-assisted carrier redistribution between these states. Our results show that luminescence characterization of lead-salt quantum dots necessarily requires both low temperatures and excitation densities in order to provide reliable ensemble parameters.

UR - https://www.scopus.com/pages/publications/84937064830

U2 - 10.1063/1.4926806

DO - 10.1063/1.4926806

M3 - 文章

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SN - 0003-6951

VL - 107

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 2

M1 - 022106

ER -

Temperature dependence of the fundamental excitonic resonance in lead-salt quantum dots

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