Exciton Radiative Recombination Dynamics and Nonradiative Energy Transfer in Two-Dimensional Transition-Metal Dichalcogenides

被引：36

作者：

Liu, Huan ^{[1
]}

Wang, Ting ^{[1
]}

Wang, Chong ^{[1
]}

Liu, Dameng ^{[1
]}

Luo, Jianbin ^{[1
]}

机构：

[1] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2019年 / 123卷 / 15期

基金：

中国国家自然科学基金;

关键词：

STRONG PHOTOLUMINESCENCE ENHANCEMENT; QUANTUM DOTS; SINGLE-LAYER; MOS2; MONOLAYER; GRAPHENE; MULTILAYER; LIFETIMES;

D O I：

10.1021/acs.jpcc.8b12179

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We employ fluorescence lifetime imaging technology to explore exciton radiative recombination dynamics in layered transition-metal dichalcogenides (TMDCs) and nonradiative energy transfer from CdSe/ZnS quantum dot (QD) to monolayer TMDCs (MoS2, WS2, and WSe2). Owing to an indirect direct band gap transition, exciton radiative lifetimes decrease with the TMDCs' layer number reducing. The fastest exciton recombination rate is observed in monolayer TMDCs, which is attributed to their reduced dielectric screening. Furthermore, the effect of reduced dielectric screening on nonradiative energy transfer from QDs to monolayer TMDCs is investigated. The fastest energy transfer rate is observed in QD/WS2 heterostructure owing to weak dielectric screening of monolayer WS2, and the slowest rate in QDs/MoS2 is caused by strong dielectric screening of monolayer MoS2. Our experiments provide fundamental insights into exciton recombination dynamics in TMDCs and potentially enable new avenues for controlling motion of excitonic energy conversion on a nanoscale.

引用

页码：10087 / 10093

页数：7

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