High-Efficiency Optical Gain in Type-II Semiconductor Nanocrystals of Alloyed Colloidal Quantum Wells

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2017-11-01

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Guzelturk, Burak
Keleştemur, Yusuf
Olutas, Murat
Li, Quyang
Lian, Tianquan
Demir, Hilmi Volkan

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Colloidal nanocrystals having controlled size, tailored shape, and tuned composition have been explored for optical gain and lasing. Among these, nanocrystals having Type-II electronic structure have been introduced toward low-threshold gain. However, to date, their performance has remained severely limited due to diminishing oscillator strength and modest absorption cross-section. Overcoming these problems, here we realize highly efficient optical gain in Type-II nanocrystals by using alloyed colloidal quantum wells. With composition-tuned core/alloyed-crown CdSe/CdSexTe1-x quantum wells, we achieved amplified spontaneous emission thresholds as low as 26 mu J/cm(2), long optical gain lifetimes (tau(gain) approximate to 400 ps), and high modal gain coefficients (g(modal) approximate to 930 cm(-1)). We uncover that the optical gain in these Type-II quantum wells arises from the excitations localized to the alloyed-crown region that are electronically coupled to the charge-transfer state. These alloyed heteronanostructures exhibiting remarkable optical gain performance are expected to be highly appealing for future display and lighting technologies.

URI

https://hdl.handle.net/11511/92398

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS

DOI

https://doi.org/10.1021/acs.jpclett.7b02367

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Department of Metallurgical and Materials Engineering, Article

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Citation Formats

B. Guzelturk, Y. Keleştemur, M. Olutas, Q. Li, T. Lian, and H. V. Demir, “High-Efficiency Optical Gain in Type-II Semiconductor Nanocrystals of Alloyed Colloidal Quantum Wells,” JOURNAL OF PHYSICAL CHEMISTRY LETTERS, vol. 8, no. 21, pp. 5317–5324, 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/92398.