Green Stimulated Emission Boosted by Nonradiative Resonant Energy Transfer from Blue Quantum Dots

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• 作者：Yuan Gao ; Guannan Yu ; Yue Wang ; Cuong Dang ; Tze Chien Sum ; Handong Sun ; Hilmi Volkan Demir
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：July 21, 2016
• 年：2016
• 卷：7
• 期：14
• 页码：2772-2778
• 全文大小：437K
• 年卷期：0
• ISSN：1948-7185

文摘

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.