Trion Emission Dominates the Low-Temperature Photoluminescence of CdSe Nanoplatelets

Felipe V. Antolinez; Freddy T. Rabouw; Aurelio A. Rossinelli; Robert C. Keitel; Ario Cocina; Michael A. Becker; David J. Norris

doi:10.1021/acs.nanolett.0c01707

Trion Emission Dominates the Low-Temperature Photoluminescence of CdSe Nanoplatelets

Felipe V. Antolinez, Freddy T. Rabouw, Aurelio A. Rossinelli, Robert C. Keitel, Ario Cocina, Michael A. Becker, David J. Norris^*

^*Corresponding author for this work

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

Abstract

Colloidal nanoplatelets (NPLs) are atomically flat, quasi-two-dimensional particles of a semiconductor. Despite intense interest in their optical properties, several observations concerning the emission of CdSe NPLs remain puzzling. While their ensemble photoluminescence spectrum consists of a single narrow peak at room temperature, two distinct emission features appear at temperatures below ∼160 K. Several competing explanations for the origin of this two-color emission have been proposed. Here, we present temperature- and time-dependent experiments demonstrating that the two emission colors are due to two subpopulations of uncharged and charged NPLs. We study dilute films of isolated NPLs, thus excluding any explanation relying on collective effects due to NPL stacking. Temperature-dependent measurements explain that trion emission from charged NPLs is bright at cryogenic temperatures, while temperature activation of nonradiative Auger recombination quenches the trion emission above 160 K. Our findings clarify many of the questions surrounding the photoluminescence of CdSe NPLs.

Original language	English
Pages (from-to)	5814-5820
Number of pages	7
Journal	Nano Letters
Volume	20
Issue number	8
DOIs	https://doi.org/10.1021/acs.nanolett.0c01707
Publication status	Published - 12 Aug 2020

Bibliographical note

Funding Information:
This work was supported by the European Research Council under the European Union’s Seventh Framework Program (FP/2007–2013)/ERC Grant Agreement 339905 (QuaDoPS Advanced Grant) and by the Swiss National Science Foundation (SNSF) under Grant 200021_165559. F.T.R. and M.A.B. acknowledge support from The Netherlands Organization for Scientific Research (NWO, Rubicon Grant 680-50-1509) and the SNSF QuantERA project RouTe (Grant 20QT21_175389), respectively.

Publisher Copyright:
Copyright © 2020 American Chemical Society.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Funding

This work was supported by the European Research Council under the European Union’s Seventh Framework Program (FP/2007–2013)/ERC Grant Agreement 339905 (QuaDoPS Advanced Grant) and by the Swiss National Science Foundation (SNSF) under Grant 200021_165559. F.T.R. and M.A.B. acknowledge support from The Netherlands Organization for Scientific Research (NWO, Rubicon Grant 680-50-1509) and the SNSF QuantERA project RouTe (Grant 20QT21_175389), respectively.

Keywords

Auger recombination
CdSe nanoplatelets
low temperature
shakeup line
trion emission
weak confinement

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@article{97b14a2672014ba08d384a227f4f7ebe,

title = "Trion Emission Dominates the Low-Temperature Photoluminescence of CdSe Nanoplatelets",

abstract = "Colloidal nanoplatelets (NPLs) are atomically flat, quasi-two-dimensional particles of a semiconductor. Despite intense interest in their optical properties, several observations concerning the emission of CdSe NPLs remain puzzling. While their ensemble photoluminescence spectrum consists of a single narrow peak at room temperature, two distinct emission features appear at temperatures below ∼160 K. Several competing explanations for the origin of this two-color emission have been proposed. Here, we present temperature- and time-dependent experiments demonstrating that the two emission colors are due to two subpopulations of uncharged and charged NPLs. We study dilute films of isolated NPLs, thus excluding any explanation relying on collective effects due to NPL stacking. Temperature-dependent measurements explain that trion emission from charged NPLs is bright at cryogenic temperatures, while temperature activation of nonradiative Auger recombination quenches the trion emission above 160 K. Our findings clarify many of the questions surrounding the photoluminescence of CdSe NPLs. ",

keywords = "Auger recombination, CdSe nanoplatelets, low temperature, shakeup line, trion emission, weak confinement",

author = "Antolinez, \{Felipe V.\} and Rabouw, \{Freddy T.\} and Rossinelli, \{Aurelio A.\} and Keitel, \{Robert C.\} and Ario Cocina and Becker, \{Michael A.\} and Norris, \{David J.\}",

note = "Funding Information: This work was supported by the European Research Council under the European Union{\textquoteright}s Seventh Framework Program (FP/2007–2013)/ERC Grant Agreement 339905 (QuaDoPS Advanced Grant) and by the Swiss National Science Foundation (SNSF) under Grant 200021\_165559. F.T.R. and M.A.B. acknowledge support from The Netherlands Organization for Scientific Research (NWO, Rubicon Grant 680-50-1509) and the SNSF QuantERA project RouTe (Grant 20QT21\_175389), respectively. Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2020",

month = aug,

day = "12",

doi = "10.1021/acs.nanolett.0c01707",

language = "English",

volume = "20",

pages = "5814--5820",

journal = "Nano Letters",

issn = "1530-6984",

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T1 - Trion Emission Dominates the Low-Temperature Photoluminescence of CdSe Nanoplatelets

AU - Antolinez, Felipe V.

AU - Rabouw, Freddy T.

AU - Rossinelli, Aurelio A.

AU - Keitel, Robert C.

AU - Cocina, Ario

AU - Becker, Michael A.

AU - Norris, David J.

N1 - Funding Information: This work was supported by the European Research Council under the European Union’s Seventh Framework Program (FP/2007–2013)/ERC Grant Agreement 339905 (QuaDoPS Advanced Grant) and by the Swiss National Science Foundation (SNSF) under Grant 200021_165559. F.T.R. and M.A.B. acknowledge support from The Netherlands Organization for Scientific Research (NWO, Rubicon Grant 680-50-1509) and the SNSF QuantERA project RouTe (Grant 20QT21_175389), respectively. Publisher Copyright: Copyright © 2020 American Chemical Society. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/8/12

Y1 - 2020/8/12

N2 - Colloidal nanoplatelets (NPLs) are atomically flat, quasi-two-dimensional particles of a semiconductor. Despite intense interest in their optical properties, several observations concerning the emission of CdSe NPLs remain puzzling. While their ensemble photoluminescence spectrum consists of a single narrow peak at room temperature, two distinct emission features appear at temperatures below ∼160 K. Several competing explanations for the origin of this two-color emission have been proposed. Here, we present temperature- and time-dependent experiments demonstrating that the two emission colors are due to two subpopulations of uncharged and charged NPLs. We study dilute films of isolated NPLs, thus excluding any explanation relying on collective effects due to NPL stacking. Temperature-dependent measurements explain that trion emission from charged NPLs is bright at cryogenic temperatures, while temperature activation of nonradiative Auger recombination quenches the trion emission above 160 K. Our findings clarify many of the questions surrounding the photoluminescence of CdSe NPLs.

AB - Colloidal nanoplatelets (NPLs) are atomically flat, quasi-two-dimensional particles of a semiconductor. Despite intense interest in their optical properties, several observations concerning the emission of CdSe NPLs remain puzzling. While their ensemble photoluminescence spectrum consists of a single narrow peak at room temperature, two distinct emission features appear at temperatures below ∼160 K. Several competing explanations for the origin of this two-color emission have been proposed. Here, we present temperature- and time-dependent experiments demonstrating that the two emission colors are due to two subpopulations of uncharged and charged NPLs. We study dilute films of isolated NPLs, thus excluding any explanation relying on collective effects due to NPL stacking. Temperature-dependent measurements explain that trion emission from charged NPLs is bright at cryogenic temperatures, while temperature activation of nonradiative Auger recombination quenches the trion emission above 160 K. Our findings clarify many of the questions surrounding the photoluminescence of CdSe NPLs.

KW - Auger recombination

KW - CdSe nanoplatelets

KW - low temperature

KW - shakeup line

KW - trion emission

KW - weak confinement

UR - https://www.scopus.com/pages/publications/85089614938

U2 - 10.1021/acs.nanolett.0c01707

DO - 10.1021/acs.nanolett.0c01707

M3 - Article

C2 - 32589429

AN - SCOPUS:85089614938

SN - 1530-6984

VL - 20

SP - 5814

EP - 5820

JO - Nano Letters

JF - Nano Letters

IS - 8

ER -

Trion Emission Dominates the Low-Temperature Photoluminescence of CdSe Nanoplatelets

Abstract

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Keywords

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