High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells
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...
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sg-ntu-dr.10356-1435132023-02-28T19:51:59Z High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells Guzelturk, Burak Kelestemur, Yusuf Olutas, Murat Li, Qiuyang Lian, Tianquan Demir, Hilmi Volkan School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays Engineering::Electrical and electronic engineering Colloidal Quantum Wells Cadmium Compounds 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 μJ/cm2, long optical gain lifetimes (τgain ≈ 400 ps), and high modal gain coefficients (gmodal ≈ 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. Agency for Science, Technology and Research (A*STAR) National Research Foundation (NRF) Accepted version We acknowledge the financial support partly from National Research Foundation, Prime Minister’s Office, Singapore under its NRF Investigatorship Award (NRF-NRFI2016-08) and A*STAR SERC PHAROS Program (152 73 00025) of Singapore and partly from EU-FP7 Nanophotonics4Energy NoE and TUBITAK 114F326 and 114E449. H.V.D. acknowledges additional support from ESF-EURYI and TUBA, and Y.K. acknowledges support from TUBITAK-BIDEB. T.L. also gratefully acknowledges the financial support from the U.S. National Science Foundation (CHE-1309817). 2020-09-07T05:00:29Z 2020-09-07T05:00:29Z 2017 Journal Article Guzelturk, B., Kelestemur, Y., Olutas, M., Li, Q., Lian, T., & Demir, H. V. (2017). High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells. The Journal of Physical Chemistry Letters, 8(21),5317–5324. doi:10.1021/acs.jpclett.7b02367 1948-7185 https://hdl.handle.net/10356/143513 10.1021/acs.jpclett.7b02367 29022715 2-s2.0-85032841492 21 8 5317 5324 en NRF-NRFI2016-08 152 73 00025 The Journal of Physical Chemistry Letters This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpclett.7b02367 application/pdf |
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Engineering::Electrical and electronic engineering Colloidal Quantum Wells Cadmium Compounds Guzelturk, Burak Kelestemur, Yusuf Olutas, Murat Li, Qiuyang Lian, Tianquan Demir, Hilmi Volkan High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells |
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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 μJ/cm2, long optical gain lifetimes (τgain ≈ 400 ps), and high modal gain coefficients (gmodal ≈ 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. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Guzelturk, Burak Kelestemur, Yusuf Olutas, Murat Li, Qiuyang Lian, Tianquan Demir, Hilmi Volkan |
format |
Article |
author |
Guzelturk, Burak Kelestemur, Yusuf Olutas, Murat Li, Qiuyang Lian, Tianquan Demir, Hilmi Volkan |
author_sort |
Guzelturk, Burak |
title |
High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells |
title_short |
High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells |
title_full |
High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells |
title_fullStr |
High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells |
title_full_unstemmed |
High-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells |
title_sort |
high-efficiency optical gain in type-ii semiconductor nanocrystals of alloyed colloidal quantum wells |
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2020 |
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https://hdl.handle.net/10356/143513 |
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1759854616053284864 |