Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets
Here, we systematically investigated the spontaneous and stimulated emission performances of solution-processed atomically flat quasi-2D nanoplatelets (NPLs) as a function of their lateral size using colloidal CdSe core NPLs. We found that the photoluminescence quantum efficiency of these NPLs decre...
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sg-ntu-dr.10356-820772023-02-28T19:29:36Z Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets Olutas, Murat Guzelturk, Burak Kelestemur, Yusuf Yeltik, Aydan Delikanli, Savas Demir, Hilmi Volkan School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences Amplified spontaneous emission Stimulated emission Colloidal quantum wells Semiconductor nanoplatelets Lateral size Photoluminescence quantum efficiency Giant two-photon absorption cross-section Here, we systematically investigated the spontaneous and stimulated emission performances of solution-processed atomically flat quasi-2D nanoplatelets (NPLs) as a function of their lateral size using colloidal CdSe core NPLs. We found that the photoluminescence quantum efficiency of these NPLs decreases with increasing lateral size while their photoluminescence decay rate accelerates. This strongly suggests that nonradiative channels prevail in the NPL ensembles having extended lateral size, which is well-explained by the increasing number of the defected NPL subpopulation. In the case of stimulated emission the role of lateral size in NPLs influentially emerges both in the single- and two-photon absorption (1PA and 2PA) pumping. In the amplified spontaneous emission measurements, we uncovered that the stimulated emission thresholds of 1PA and 2PA exhibit completely opposite behavior with increasing lateral size. The NPLs with larger lateral sizes exhibited higher stimulated emission thresholds under 1PA pumping due to the dominating defected subpopulation in larger NPLs. On the other hand, surprisingly, larger NPLs remarkably revealed lower 2PA-pumped amplified spontaneous emission thresholds. This is attributed to the observation of a “giant” 2PA cross-section overwhelmingly growing with increasing lateral size and reaching record levels higher than 106 GM, at least an order of magnitude stronger than colloidal quantum dots and rods. These findings suggest that the lateral size control in the NPLs, which is commonly neglected, is essential to high-performance colloidal NPL optoelectronic devices in addition to the vertical monolayer control. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) Accepted version 2016-01-22T03:24:44Z 2019-12-06T14:46:03Z 2016-01-22T03:24:44Z 2019-12-06T14:46:03Z 2015 Journal Article Olutas, M., Guzelturk, B., Kelestemur, Y., Yeltik, A., Delikanli, S., & Demir, H. V. (2015). Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets. ACS Nano, 9(5), 5041-5050. 1936-0851 https://hdl.handle.net/10356/82077 http://hdl.handle.net/10220/39749 10.1021/acsnano.5b01927 en ACS Nano © 2015 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Nano, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1021/acsnano.5b01927]. 28 p. application/pdf |
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Amplified spontaneous emission Stimulated emission Colloidal quantum wells Semiconductor nanoplatelets Lateral size Photoluminescence quantum efficiency Giant two-photon absorption cross-section |
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Amplified spontaneous emission Stimulated emission Colloidal quantum wells Semiconductor nanoplatelets Lateral size Photoluminescence quantum efficiency Giant two-photon absorption cross-section Olutas, Murat Guzelturk, Burak Kelestemur, Yusuf Yeltik, Aydan Delikanli, Savas Demir, Hilmi Volkan Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets |
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Here, we systematically investigated the spontaneous and stimulated emission performances of solution-processed atomically flat quasi-2D nanoplatelets (NPLs) as a function of their lateral size using colloidal CdSe core NPLs. We found that the photoluminescence quantum efficiency of these NPLs decreases with increasing lateral size while their photoluminescence decay rate accelerates. This strongly suggests that nonradiative channels prevail in the NPL ensembles having extended lateral size, which is well-explained by the increasing number of the defected NPL subpopulation. In the case of stimulated emission the role of lateral size in NPLs influentially emerges both in the single- and two-photon absorption (1PA and 2PA) pumping. In the amplified spontaneous emission measurements, we uncovered that the stimulated emission thresholds of 1PA and 2PA exhibit completely opposite behavior with increasing lateral size. The NPLs with larger lateral sizes exhibited higher stimulated emission thresholds under 1PA pumping due to the dominating defected subpopulation in larger NPLs. On the other hand, surprisingly, larger NPLs remarkably revealed lower 2PA-pumped amplified spontaneous emission thresholds. This is attributed to the observation of a “giant” 2PA cross-section overwhelmingly growing with increasing lateral size and reaching record levels higher than 106 GM, at least an order of magnitude stronger than colloidal quantum dots and rods. These findings suggest that the lateral size control in the NPLs, which is commonly neglected, is essential to high-performance colloidal NPL optoelectronic devices in addition to the vertical monolayer control. |
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School of Electrical and Electronic Engineering |
author_facet |
School of Electrical and Electronic Engineering Olutas, Murat Guzelturk, Burak Kelestemur, Yusuf Yeltik, Aydan Delikanli, Savas Demir, Hilmi Volkan |
format |
Article |
author |
Olutas, Murat Guzelturk, Burak Kelestemur, Yusuf Yeltik, Aydan Delikanli, Savas Demir, Hilmi Volkan |
author_sort |
Olutas, Murat |
title |
Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets |
title_short |
Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets |
title_full |
Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets |
title_fullStr |
Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets |
title_full_unstemmed |
Lateral Size-Dependent Spontaneous and Stimulated Emission Properties in Colloidal CdSe Nanoplatelets |
title_sort |
lateral size-dependent spontaneous and stimulated emission properties in colloidal cdse nanoplatelets |
publishDate |
2016 |
url |
https://hdl.handle.net/10356/82077 http://hdl.handle.net/10220/39749 |
_version_ |
1759857015420616704 |