Photoluminescence properties and exciton dynamics in monolayer WSe2

In this work, comprehensive temperature and excitation power dependent photoluminescence and time-resolved photoluminescence studies are carried out on monolayer WSe2 to reveal its properties of exciton emissions and related excitonic dynamics. Competitions between the localized and delocalized exci...

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Bibliographic Details
Published inApplied physics letters Vol. 105; no. 10
Main Authors Yan, Tengfei, Qiao, Xiaofen, Liu, Xiaona, Tan, Pingheng, Zhang, Xinhui
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 08.09.2014
Subjects
Applied physics
Excitation
Excitons
Monolayers
Photoluminescence
Properties (attributes)
Temperature dependence
Time dependence
Trions
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Summary:In this work, comprehensive temperature and excitation power dependent photoluminescence and time-resolved photoluminescence studies are carried out on monolayer WSe2 to reveal its properties of exciton emissions and related excitonic dynamics. Competitions between the localized and delocalized exciton emissions, as well as the exciton and trion emissions are observed, respectively. These competitions are suggested to be responsible for the abnormal temperature and excitation intensity dependent photoluminescence properties. The radiative lifetimes of both excitons and trions exhibit linear dependence on temperature within the temperature regime below 260 K, providing further evidence for two-dimensional nature of monolayer material.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4895471