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Title: Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance
Authors: Kelestemur, Yusuf
Dede, Didem
Gungor, Kivanc
Usanmaz, Can Firat
Erdem, Onur
Demir, Hilmi Volkan
Keywords: Science::Physics
Issue Date: 2017
Source: Kelestemur, Y., Dede, D., Gungor, K., Usanmaz, C. F., Erdem, O. & Demir, H. V. (2017). Alloyed heterostructures of CdSexS1–x nanoplatelets with highly tunable optical gain performance. Chemistry of Materials, 29(11), 4857-4865.
Journal: Chemistry of Materials
Abstract: Here, we designed and synthesized alloyed heterostructures of CdSe S nanoplatelets (NPLs) using CdS coating in the lateral and vertical directions for the achievement of highly tunable optical gain performance. By using homogeneously alloyed CdSe S core NPLs as a seed, we prepared CdSe S /CdS core/crown NPLs, where CdS crown region is extended only in the lateral direction. With the sidewall passivation around inner CdSe S cores, we achieved enhanced photoluminescence quantum yield (PL-QY) (reaching 60%), together with increased absorption cross-section and improved stability without changing the emission spectrum of CdSe S alloyed core NPLs. In addition, we further extended the spectral tunability of these solution-processed NPLs with the synthesis of CdSe S /CdS core/shell NPLs. Depending on the sulfur composition of the CdSe S core and thickness of the CdS shell, CdSe S /CdS core/shell NPLs possessed highly tunable emission characteristics within the spectral range of 560-650 nm. Finally, we studied the optical gain performances of different heterostructures of CdSe S alloyed NPLs offering great advantages, including reduced reabsorption and spectrally tunable optical gain range. Despite their decreased PL-QY and reduced absorption cross-section upon increasing the sulfur composition, CdSe S based NPLs exhibit highly tunable amplified spontaneous emission performance together with low gain thresholds down to ∼53 μJ/cm2 .
ISSN: 1520-5002
DOI: 10.1021/acs.chemmater.7b00829
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, 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
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