Zone-Folded Longitudinal Acoustic Phonons Driving Self-Trapped State Emission in Colloidal CdSe Nanoplatelet Superlattices

Xinyu Sui; Xiaoqing Gao; Xianxin Wu; Chun Li; Xuekang Yang; Wenna Du; Zhengping Ding; Shengye Jin; Kaifeng Wu; Tze Chien Sum; Peng Gao; Junjie Liu; Xiaoding Wei; Jun Zhang; Qing Zhang; Zhiyong Tang; Xinfeng Liu

doi:10.1021/acs.nanolett.0c04169

Zone-Folded Longitudinal Acoustic Phonons Driving Self-Trapped State Emission in Colloidal CdSe Nanoplatelet Superlattices

Xinyu Sui, Xiaoqing Gao, Xianxin Wu, Chun Li, Xuekang Yang, Wenna Du, Zhengping Ding, Shengye Jin, Kaifeng Wu, Tze Chien Sum, Peng Gao, Junjie Liu, Xiaoding Wei, Jun Zhang, Qing Zhang, Zhiyong Tang^*, Xinfeng Liu^*

^*Corresponding author for this work

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

31 Citations (Scopus)

Abstract

Colloidal CdSe nanoplatelets (NPLs) have substantial potential in light-emitting applications because of their quantum-well-like characteristics. The self-trapped state (STS), originating from strong electron-phonon coupling (EPC), is promising in white light luminance because of its broadband emission. However, achieving STS in CdSe NPLs is extremely challenging because of their intrinsic weak EPC nature. Herein, we developed a strong STS emission in the spectral range of 450-600 nm by building superlattice (SL) structures with colloidal CdSe NPLs. We demonstrated that STS is generated via strong coupling of excitons and zone-folded longitudinal acoustic phonons with formation time of ∼450 fs and localization length of ∼0.56 nm. The Huang-Rhys factor, describing the EPC strength in SL structure, is estimated to be ∼19.9, which is much larger than that (∼0.1) of monodispersed CdSe NPLs. Our results provide an in-depth understanding of STS and a platform for generating and manipulating STS by designing SL structures.

Original language	English
Pages (from-to)	4137-4144
Number of pages	8
Journal	Nano Letters
Volume	21
Issue number	10
DOIs	https://doi.org/10.1021/acs.nanolett.0c04169
Publication status	Published - May 26 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

ASJC Scopus Subject Areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Keywords

CdSe nanoplatelets
electron-phonon coupling
low-frequency Raman
self-trapped state
superlattices
transient absorption spectroscopy

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10.1021/acs.nanolett.0c04169

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title = "Zone-Folded Longitudinal Acoustic Phonons Driving Self-Trapped State Emission in Colloidal CdSe Nanoplatelet Superlattices",

abstract = "Colloidal CdSe nanoplatelets (NPLs) have substantial potential in light-emitting applications because of their quantum-well-like characteristics. The self-trapped state (STS), originating from strong electron-phonon coupling (EPC), is promising in white light luminance because of its broadband emission. However, achieving STS in CdSe NPLs is extremely challenging because of their intrinsic weak EPC nature. Herein, we developed a strong STS emission in the spectral range of 450-600 nm by building superlattice (SL) structures with colloidal CdSe NPLs. We demonstrated that STS is generated via strong coupling of excitons and zone-folded longitudinal acoustic phonons with formation time of ∼450 fs and localization length of ∼0.56 nm. The Huang-Rhys factor, describing the EPC strength in SL structure, is estimated to be ∼19.9, which is much larger than that (∼0.1) of monodispersed CdSe NPLs. Our results provide an in-depth understanding of STS and a platform for generating and manipulating STS by designing SL structures.",

keywords = "CdSe nanoplatelets, electron-phonon coupling, low-frequency Raman, self-trapped state, superlattices, transient absorption spectroscopy",

author = "Xinyu Sui and Xiaoqing Gao and Xianxin Wu and Chun Li and Xuekang Yang and Wenna Du and Zhengping Ding and Shengye Jin and Kaifeng Wu and Sum, {Tze Chien} and Peng Gao and Junjie Liu and Xiaoding Wei and Jun Zhang and Qing Zhang and Zhiyong Tang and Xinfeng Liu",

note = "Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",

year = "2021",

month = may,

day = "26",

doi = "10.1021/acs.nanolett.0c04169",

language = "English",

volume = "21",

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TY - JOUR

T1 - Zone-Folded Longitudinal Acoustic Phonons Driving Self-Trapped State Emission in Colloidal CdSe Nanoplatelet Superlattices

AU - Sui, Xinyu

AU - Gao, Xiaoqing

AU - Wu, Xianxin

AU - Li, Chun

AU - Yang, Xuekang

AU - Du, Wenna

AU - Ding, Zhengping

AU - Jin, Shengye

AU - Wu, Kaifeng

AU - Sum, Tze Chien

AU - Gao, Peng

AU - Liu, Junjie

AU - Wei, Xiaoding

AU - Zhang, Jun

AU - Zhang, Qing

AU - Tang, Zhiyong

AU - Liu, Xinfeng

PY - 2021/5/26

Y1 - 2021/5/26

N2 - Colloidal CdSe nanoplatelets (NPLs) have substantial potential in light-emitting applications because of their quantum-well-like characteristics. The self-trapped state (STS), originating from strong electron-phonon coupling (EPC), is promising in white light luminance because of its broadband emission. However, achieving STS in CdSe NPLs is extremely challenging because of their intrinsic weak EPC nature. Herein, we developed a strong STS emission in the spectral range of 450-600 nm by building superlattice (SL) structures with colloidal CdSe NPLs. We demonstrated that STS is generated via strong coupling of excitons and zone-folded longitudinal acoustic phonons with formation time of ∼450 fs and localization length of ∼0.56 nm. The Huang-Rhys factor, describing the EPC strength in SL structure, is estimated to be ∼19.9, which is much larger than that (∼0.1) of monodispersed CdSe NPLs. Our results provide an in-depth understanding of STS and a platform for generating and manipulating STS by designing SL structures.

AB - Colloidal CdSe nanoplatelets (NPLs) have substantial potential in light-emitting applications because of their quantum-well-like characteristics. The self-trapped state (STS), originating from strong electron-phonon coupling (EPC), is promising in white light luminance because of its broadband emission. However, achieving STS in CdSe NPLs is extremely challenging because of their intrinsic weak EPC nature. Herein, we developed a strong STS emission in the spectral range of 450-600 nm by building superlattice (SL) structures with colloidal CdSe NPLs. We demonstrated that STS is generated via strong coupling of excitons and zone-folded longitudinal acoustic phonons with formation time of ∼450 fs and localization length of ∼0.56 nm. The Huang-Rhys factor, describing the EPC strength in SL structure, is estimated to be ∼19.9, which is much larger than that (∼0.1) of monodispersed CdSe NPLs. Our results provide an in-depth understanding of STS and a platform for generating and manipulating STS by designing SL structures.

KW - CdSe nanoplatelets

KW - electron-phonon coupling

KW - low-frequency Raman

KW - self-trapped state

KW - superlattices

KW - transient absorption spectroscopy

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ER -

Zone-Folded Longitudinal Acoustic Phonons Driving Self-Trapped State Emission in Colloidal CdSe Nanoplatelet Superlattices

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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