Green stimulated emission boosted by nonradiative resonant energy transfer from blue quantum dots
Date
2016Source Title
Journal of Physical Chemistry Letters
Print ISSN
1948-7185
Publisher
American Chemical Society
Volume
7
Issue
14
Pages
2772 - 2778
Language
English
Type
ArticleItem Usage Stats
214
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372
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Abstract
Thanks to their tunability and versatility, the colloidal quantum dots (CQDs) made of II-VI semiconductor compound offer the potential to bridge the "green gap" in conventional semiconductors. However, when the CQDs are pumped to much higher initial excitonic states compared to their bandgap, multiexciton interaction is enhanced, leading to a much higher stimulated emission threshold. 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. By introducing the blue CQDs as exciton donors, the lasing threshold of the green CQDs, is reduced dramatically. The blue CQDs thus serve as an energy-transferring buffer medium to reduce excitation energy from pumping photons in a controlled way by injecting photoinduced excitons into green CQDs. Our newly developed colloidal pumping scheme could enable efficient CQD lasers of full visible colors by a single pump source and cascaded exciton transfer. This would potentially pave the way for an efficient multicolor laser for lighting and display applications.
Keywords
Energy transferExcitons
Nanocrystals
Pumping (laser)
Semiconductor lasers
Stimulated emission
Colloidal quantum dots
Display application
Exciton transfer
Lasing threshold
Pumping schemes
Resonance energy transfer
Resonant energy transfer
Semiconductor compounds
Semiconductor quantum dots
Permalink
http://hdl.handle.net/11693/36735Published Version (Please cite this version)
http://dx.doi.org/10.1021/acs.jpclett.6b01122Collections
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