Details

Autor(en) / Beteiligte

• Caigas, Septem P.
• Santiago, Svette Reina Merden
• Lin, Tzu-Neng
• Lin, Cheng-An J.
• Yuan, Chi-Tsu
• Shen, Ji-Lin
• Lin, Tai-Yuan

Titel

Origins of excitation-wavelength-dependent photoluminescence in WS2 quantum dots

Ist Teil von

• Applied physics letters, 2018-02, Vol.112 (9)

Erscheinungsjahr

2018

Quelle

AIP Scitation Journals Complete

Beschreibungen/Notizen

• We report the photoluminescence studies of pristine and diethylenetriamine-doped (DETA-doped) WS2 quantum dots (QDs) synthesized by pulsed laser ablation. The DETA-doped WS2 QDs revealed a notable improvement of the luminescence quantum yield from 0.1% to 15.2% in comparison to pristine WS2 QDs. On the basis of the photoluminescence (PL) under different excitation wavelengths and the emission-energy dependence of PL dynamics, we suggest that the excitation-wavelength-dependent (excitation-wavelength-independent) PL for pristine (DETA-doped) WS2 QDs is attributed to the recombination of carriers from the localized (delocalized) states.