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

被引：32

作者：

Sui, Xinyu ^{[1
,2
]}

Gao, Xiaoqing ^{[3
]}

Wu, Xianxin ^{[1
,2
]}

Li, Chun ^{[1
,2
,4
]}

Yang, Xuekang ^{[2
,5
]}

Du, Wenna ^{[1
,6
]}

Ding, Zhengping ^{[7
]}

Jin, Shengye ^{[8
,9
]}

Wu, Kaifeng ^{[8
,9
]}

Sum, Tze Chien ^{[10
]}

Gao, Peng ^{[7
]}

Liu, Junjie ^{[11
,12
]}

Wei, Xiaoding ^{[11
,12
]}

Zhang, Jun ^{[13
,14
]}

Zhang, Qing ^{[4
]}

Tang, Zhiyong ^{[2
,3
]}

Liu, Xinfeng ^{[1
,2
]}

机构：

[1] Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Standardizat & Measurement Nanotechno, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Univ Chinese Acad Sci, Wenzhou Inst, Wenzhou 325000, Peoples R China

[4] Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China

[5] Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China

[6] Chinese Acad Sci, Inst Semicond, Key Lab Semicond Mat Sci, Beijing Key Lab Low Dimens Semicond Mat & Devices, Beijing 100083, Peoples R China

[7] Peking Univ, Sch Phys, Electron Microscopy Lab, Beijing 100871, Peoples R China

[8] Chinese Acad Sci, State Key Lab Mol React Dynam, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

[9] Chinese Acad Sci, Collaborat Innovat Ctr Chem Energy Mat iChEM, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

[10] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore

[11] Peking Univ, Coll Engn, Dept Mech & Engn Sci, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China

[12] Peking Univ, Beijing Innovat Ctr Engn Sci & Adv Technol, Beijing 100871, Peoples R China

[13] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China

[14] Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100083, Peoples R China

来源：

NANO LETTERS | 2021年 / 21卷 / 10期

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

CdSe nanoplatelets; self-trapped state; electron-phonon coupling; superlattices; transient absorption spectroscopy; low-frequency Raman; WHITE-LIGHT EMISSION; SEMICONDUCTOR NANOCRYSTALS; DYNAMICS; ELECTRON; FORCES;

D O I：

10.1021/acs.nanolett.0c04169

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 similar to 450 fs and localization length of similar to 0.56 nm. The Huang-Rhys factor, describing the EPC strength in SL structure, is estimated to be similar to 19.9, which is much larger than that (similar to 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.

引用

页码：4137 / 4144

页数：8

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