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Title: Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling
Authors: Taghipour, Nima
Delikanli, Savas
Shendre, Sushant
Sak, Mustafa
Li, Mingjie
Isik, Furkan
Tanriover, Ibrahim
Guzelturk, Burak
Sum, Tze Chien
Demir, Hilmi Volkan
Keywords: Science
Issue Date: 2020
Source: Taghipour, N., Delikanli, S., Shendre, S., Sak, M., Li, M., Isik, F., ... Demir, H. V. (2020). Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling. Nature Communications, 11(1), 3305-. doi:10.1038/s41467-020-17032-8
Journal: Nature Communications
Abstract: 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 (Ng)≈ 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 ~ 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 μJ cm-2. These results represent a significant step towards the realization of solution-processable electrically-driven colloidal lasers.
ISSN: 2041-1723
DOI: 10.1038/s41467-020-17032-8
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2020 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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