Alloyed Heterostructures of CdSexS1-x Nanoplatelets with Highly Tunable Optical Gain Performance

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2017-06-01

Author

Keleştemur, Yusuf
Gungor, Kivanc
Usanmaz, Can Firat
Erdem, Onur
Demir, Hilmi Volkan

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Here, we designed and synthesized alloyed heterostructures of CdSexS1-x nanoplatelets (NPLs) using CdS coating in the lateral and vertical directions for the achievement of highly tunable optical gain performance. By using homogeneously alloyed CdSexS1-x core NPLs as a seed, we prepared CdSexS1-x/CdS core/crown NPLs, where CdS crown region is extended only in the lateral direction. With the sidewall passivation around inner CdSexS1-x 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 CdSexS1-x, alloyed core NPLs. In addition, we further extended the spectral tunability of these solution-processed NPLs with the synthesis of CdSexS1-x/CdS core/shell NPLs. Depending on the sulfur composition of the CdSexS1-x, core and thickness of the CdS shell, CdSexS1-x/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 CdSexS1-x, 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, CdSexS1-x based NPLs exhibit highly tunable amplified spontaneous emission performance together with low gain thresholds down to similar to 53 mu J/cm(2).

URI

https://hdl.handle.net/11511/92416

Journal

CHEMISTRY OF MATERIALS

DOI

https://doi.org/10.1021/acs.chemmater.7b00829

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Department of Metallurgical and Materials Engineering, Article

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Citation Formats

Y. Keleştemur, K. Gungor, C. F. Usanmaz, O. Erdem, and H. V. Demir, “Alloyed Heterostructures of CdSexS1-x Nanoplatelets with Highly Tunable Optical Gain Performance,” CHEMISTRY OF MATERIALS, vol. 29, no. 11, pp. 4857–4865, 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/92416.