Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-17032-8
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Funding
- Singapore National Research Foundation [NRF-NRFI2016-08, NRF-CRP14-2014-03]
- Science and Engineering Research Council, Agency for Science, Technology, and Research (A*STAR) of Singapore
- TUBITAK [115E679, 115F279, 117E713]
- Singapore National Research Foundation through the Competitive Research Programme (CRP) [NRF-CRP14-2014-03]
- TUBA
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Colloidal semiconductor quantum wells have emerged as a promising material platform for use in solution-processable lasers. However, applications relying on their optical gain suffer from nonradiative Auger decay due to multi-excitonic nature of light amplification in II-VI semiconductor nanocrystals. Here, we show sub-single exciton level of optical gain threshold in specially engineered CdSe/CdS@CdZnS core/crown@gradient-alloyed shell quantum wells. This sub-single exciton ensemble-averaged gain threshold of (N-g)approximate to 0.84 (per particle) resulting from impeded Auger recombination, along with a large absorption cross-section of quantum wells, enables us to observe the amplified spontaneous emission starting at an ultralow pump fluence of similar to 800 nJ cm(-2), at least three-folds better than previously reported values among all colloidal nanocrystals. Finally, using these gradient shelled quantum wells, we demonstrate a vertical cavity surface-emitting laser operating at a low lasing threshold of 7.5 mu J cm(-2). These results represent a significant step towards the realization of solution-processable electrically-driven colloidal lasers.
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