Please use this identifier to cite or link to this item:
Title: Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells
Authors: Altintas, Yemliha
Gungor, Kivanc
Gao, Yuan
Sak, Mustafa
Quliyeva, Ulviyya
Bappi, Golam
Mutlugun, Evren
Sargent, Edward H.
Demir, Hilmi Volkan
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Altintas, Y., Gungor, K., Gao, Y., Sak, M., Quliyeva, U., Bappi, G., . . . Demir, H. V. (2019). Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells. ACS Nano, 13(9), 10662–10670. doi:10.1021/acsnano.9b04967
Journal: ACS Nano
Abstract: As an attractive materials system for high-performance optoelectronics, colloidal nanoplatelets (NPLs) benefit from atomic-level precision in thickness, minimizing emission inhomogeneous broadening. Much progress has been made to enhance their photoluminescence quantum yield (PLQY) and photostability. However, to date, layer-by-layer growth of shells at room temperature has resulted in defects that limit PLQY and thus curtail the performance of NPLs as an optical gain medium. Here, we introduce a hot-injection method growing giant alloyed shells using an approach that reduces core/shell lattice mismatch and suppresses Auger recombination. Near-unity PLQY is achieved with a narrow full-width-at-half-maximum (20 nm), accompanied by emission tunability (from 610 to 650 nm). The biexciton lifetime exceeds 1 ns, an order of magnitude longer than in conventional colloidal quantum dots (CQDs). Reduced Auger recombination enables record-low amplified spontaneous emission threshold of 2.4 μJ cm-2 under one-photon pumping. This is lower by a factor of 2.5 than the best previously reported value in nanocrystals (6 μJ cm-2 for CdSe/CdS NPLs). Here, we also report single-mode lasing operation with a 0.55 mJ cm-2 threshold under two-photoexcitation, which is also the best among nanocrystals (compared to 0.76 mJ cm-2 from CdSe/CdS CQDs in the Fabry-Pérot cavity). These findings indicate that hot-injection growth of thick alloyed shells makes ultrahigh performance NPLs.
ISSN: 1936-0851
DOI: 10.1021/acsnano.9b04967
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
MSE Journal Articles
SPMS Journal Articles

Files in This Item:
File Description SizeFormat 
2 (1).pdf1.22 MBAdobe PDFView/Open

Citations 10

Updated on Dec 28, 2021

Citations 10

Updated on Apr 26, 2021

Page view(s)

Updated on Jun 27, 2022

Download(s) 50

Updated on Jun 27, 2022

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.