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Title: Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
Authors: Gao, Yuan
Yu, Guannan
Wang, Yue
Dang, Cuong
Sum, Tze Chien
Sun, Handong
Demir, Hilmi Volkan
Keywords: Science::Chemistry::Physical chemistry
Issue Date: 2016
Source: 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
Journal: Journal of Physical Chemistry Letters 
Abstract: 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.
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.6b01122
Schools: School of Physical and Mathematical Sciences 
Rights: 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
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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