Pulsed cathodoluminescence of WS2 nanocrystals at various electron excitation energy densities: Defect induced sub-band gap emission

Pulsed cathodoluminescence of WS2 nanocrystals at various electron excitation energy densities: Defect induced sub-band gap emission

Bibliographische Detailangaben
Parent link:Journal of Luminescence: Scientific Journal.— , 1970-
Vol. 192.— 2017.— [P. 1308-1312]
Körperschaften: Национальный исследовательский Томский политехнический университет (ТПУ) Институт физики высоких технологий (ИФВТ) Лаборатория № 12, Национальный исследовательский Томский политехнический университет (ТПУ) Институт физики высоких технологий (ИФВТ) Кафедра лазерной и световой техники (ЛиСТ), Национальный исследовательский Томский политехнический университет (ТПУ) Институт физики высоких технологий (ИФВТ) Кафедра общей химии и химической технологии (ОХХТ)
Weitere Verfasser: Bozheev F. E. Farabi Esimovich, Valiev D. T. Damir Talgatovich, An V. V. Vladimir Vilorievich, Nemkaeva R. R. Renata Ruslanovna, Tikhonov A. V. Aleksandr Valerjevich, Sagurbekova G. A. Gulnara Akimovna
Zusammenfassung:Title screen
Pulsed cathodoluminescence spectra and luminescence decay kinetics of WS2 nanocrystals were studied under a high energy electron pulse excitation. Increasing electron energy density inputs to the WS2 nanocrystals lead to enhancement of the electron-hole number and their lifetimes. The maximum luminescence intensity is reached for the highest electron energy dose. The electrons, interacting with WS2 nanocrystals, form defect vacancies, wherein excited electron-holes create bound excitons which further recombine as a distinct sub-band gap emission. The lifetime of bound excitons does not depend on increasing electron doses due to the limitation of the enhancing number of bound excitons by increasing density of defects, which are radiative recombination active centers. The number of bound excitons, i.e. luminescence intensity, is proportional to the density of defects, which can be tuned by electron doses. Micro-photoluminescence measurements of the WS2 monolayer showed formation of excitons and trions.
Режим доступа: по договору с организацией-держателем ресурса
Veröffentlicht: 2017
Schlagworte:
электронный ресурс
труды учёных ТПУ
вольфрам
нанокристаллы
электроны
люминесценция
Online-Zugang:https://doi.org/10.1016/j.jlumin.2017.09.015
Format: Elektronisch Buchkapitel
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=656723

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