Low-threshold lasing from colloidal CdSe/CdSeTe core/alloyed-crown type-II heteronanoplatelets

Nanoscale
Yuan GaoHilmi Volkan Demir

Abstract

Colloidal type-II heterostructures are believed to be a promising solution-processed gain medium given their spatially separated electrons and holes for the suppression of Auger recombination and their wider emission tuning range from the visible to near-infrared region. Amplified spontaneous emission (ASE) was achieved from colloidal type-II core/shell nanocrystals several years ago. However, due to the limited charge-transfer (CT) interfacial states and minimal overlap of electron and hole wave functions, the ASE threshold has still been very high. Herein, we achieved ASE through type-II recombination at a lower threshold using CdSe/CdSeTe core/alloyed-crown nanoplatelets. Random lasing was also demonstrated in the film of these nanoplatelets under sub-ns laser-pumping. Through a detailed carrier dynamics investigation using femtosecond transient absorption, steady state, and time-resolved photoluminescence (PL) spectroscopies, we confirmed the type-II band alignment, and found that compared with normal CdSe/CdTe core/crown nanoplatelets (where no ASE/lasing was observed), CdSe/CdSeTe core/alloyed-crown nanoplatelets had a much higher PL quantum yield (75% vs. 31%), a ∼5-fold larger density of type-II charge-transfer states, ...Continue Reading

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Oct 13, 2017·The Journal of Physical Chemistry Letters·Burak GuzelturkHilmi Volkan Demir

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Citations

Jul 3, 2019·Physical Chemistry Chemical Physics : PCCP·Soma DasAmitava Patra
Dec 16, 2019·The Journal of Chemical Physics·Rachel FainblatGerd Bacher
Aug 12, 2018·Materials·Peng XiaoDong Liang
Jan 6, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Peng XiaoBaiquan Liu
Mar 7, 2020·Light, Science & Applications·Junhong YuCuong Dang
Jul 1, 2020·Nanomaterials·Dongxiang LuoBaiquan Liu
Dec 15, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Dongxiang LuoBaiquan Liu
Feb 27, 2021·Light, Science & Applications·Junhong YuCuong Dang
Aug 23, 2019·The Journal of Physical Chemistry Letters·Junhong YuCuong Dang
May 16, 2019·The Journal of Physical Chemistry Letters·Yuanyuan LiuKui Yu

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Methods Mentioned

BETA
transmission electron microscopy
Fluorescence
AFM

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