Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots

Thanks to their tunability and versatility, colloidal quantum dots (CQDs) have been attracting very much interest for laser technology. Such CQDs made of II-VI semiconductor compound offer the potential to bridge the “green gap” in conventional semiconductor materials. However, in optical pump laser...

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Main Authors: Gao, Yuan, Yu, Guannan, Wang, Yue, Dang, Cuong, Sum, Tze Chien, Sun, Handong, Demir, Hilmi Volkan
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/144850
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spelling sg-ntu-dr.10356-1448502023-02-28T19:38:14Z Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots Gao, Yuan Yu, Guannan Wang, Yue Dang, Cuong Sum, Tze Chien Sun, Handong Demir, Hilmi Volkan School of Physical and Mathematical Sciences Science::Chemistry::Physical chemistry Quantum Dots Photons Thanks to their tunability and versatility, colloidal quantum dots (CQDs) have been attracting very much interest for laser technology. Such CQDs made of II-VI semiconductor compound offer the potential to bridge the “green gap” in conventional semiconductor materials. However, in optical pump laser configuration, when the energy of excitation photons is much greater than that of emission photons, multiexciton interaction is enhanced, leading to reduced stimulated emission cross-section, broadened gain bandwidth, and enhanced photoinduced absorption. Here, to circumvent this drawback, for the first time, we show a fully colloidal gain in green enabled by a partially indirect pumping approach assisted by Förster resonance energy transfer process from blue-emitting CQDs to green ones. By introducing the blue CQDs as exciton donors, the lasing threshold of the acceptor, green CQDs, is reduced dramatically although the photon energy of optical pump is much higher compared to the bandgap energy. The blue CQDs thus serve as an energy-transferring buffer medium to reduce excitation energy from pumping photons in a controlled way by injecting photo-induced excitons into green CQDs. Our newly developed colloidal pumping scheme could enable efficient CQD lasers of full visible colours by a single pump source and cascaded exciton transfer. This would potentially pave the way for an efficient multicolour laser for lighting and display applications. Ministry of Education (MOE) National Research Foundation (NRF) Accepted version The authors would like to thank the financial support from Singapore National Research Foundation under NRF-CRP-6–2010–02 and NRF-NRFI2016-08. We would like to thank Tao Ding and Kah Ee Fong for providing CQDs that were synthesized at Luminous! Centre of Excellence for Semiconductor Lighting and Displays. The electron microscopy imaging was performed at the Facility for Analysis, Characterization, Testing and Simulation (FACTS) at Nanyang Technological University, Singapore. Financial support from Nanyang Technological University start-up grant M4080514 and M4081482, the Ministry of Education AcRF Tier 1 grant RG 9215, RG101/15, RG 70/15 and Tier 2 grants MOE2013-T2-1-081 and MOE2014-T2-1-044; the Singapore National Research Foundation (NRF) through the Singapore–Berkeley Research Initiative for Sustainable Energy (SinBeRISE) CREATE Program and the Competitive Research Program NRF-CRP14-2014-03 is also gratefully acknowledged. HVD gratefully thanks TUBA. 2020-11-30T06:32:14Z 2020-11-30T06:32:14Z 2016 Journal Article Gao, Y., Yu, G., Wang, Y., Dang, C., Sum, T. C., Sun, H., & Demir, H. V. (2016). Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots. Journal of Physical Chemistry Letters, 7(14), 2772–2778. doi:10.1021/acs.jpclett.6b01122 1948-7185 https://hdl.handle.net/10356/144850 10.1021/acs.jpclett.6b01122 14 7 2772 2778 en Journal of Physical Chemistry Letters This document is the Accepted Manuscript version of a Published Work that appeared in final form in 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.6b01122 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Chemistry::Physical chemistry
Quantum Dots
Photons
spellingShingle Science::Chemistry::Physical chemistry
Quantum Dots
Photons
Gao, Yuan
Yu, Guannan
Wang, Yue
Dang, Cuong
Sum, Tze Chien
Sun, Handong
Demir, Hilmi Volkan
Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
description Thanks to their tunability and versatility, colloidal quantum dots (CQDs) have been attracting very much interest for laser technology. Such CQDs made of II-VI semiconductor compound offer the potential to bridge the “green gap” in conventional semiconductor materials. However, in optical pump laser configuration, when the energy of excitation photons is much greater than that of emission photons, multiexciton interaction is enhanced, leading to reduced stimulated emission cross-section, broadened gain bandwidth, and enhanced photoinduced absorption. Here, to circumvent this drawback, for the first time, we show a fully colloidal gain in green enabled by a partially indirect pumping approach assisted by Förster resonance energy transfer process from blue-emitting CQDs to green ones. By introducing the blue CQDs as exciton donors, the lasing threshold of the acceptor, green CQDs, is reduced dramatically although the photon energy of optical pump is much higher compared to the bandgap energy. The blue CQDs thus serve as an energy-transferring buffer medium to reduce excitation energy from pumping photons in a controlled way by injecting photo-induced excitons into green CQDs. Our newly developed colloidal pumping scheme could enable efficient CQD lasers of full visible colours by a single pump source and cascaded exciton transfer. This would potentially pave the way for an efficient multicolour laser for lighting and display applications.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Gao, Yuan
Yu, Guannan
Wang, Yue
Dang, Cuong
Sum, Tze Chien
Sun, Handong
Demir, Hilmi Volkan
format Article
author Gao, Yuan
Yu, Guannan
Wang, Yue
Dang, Cuong
Sum, Tze Chien
Sun, Handong
Demir, Hilmi Volkan
author_sort Gao, Yuan
title Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
title_short Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
title_full Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
title_fullStr Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
title_full_unstemmed Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
title_sort green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
publishDate 2020
url https://hdl.handle.net/10356/144850
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