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Title: All-optical control of exciton flow in a colloidal quantum well complex
Authors: Yu, Junhong
Sharma, Manoj
Sharma, Ashma
Delikanli, Savas
Demir, Hilmi Volkan
Dang, Cuong
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Yu, J., Sharma, M., Sharma, A.,Delikanli, S., Demir, H. V., & Dang, C. (2020). All-optical control of exciton flow in a colloidal quantum well complex. Light, science & applications, 9(1), 27-. doi:10.1038/s41377-020-0262-7
Journal: Light, science & applications 
Abstract: Excitonics, an alternative to romising for processing information since semiconductor electronics is rapidly approaching the end of Moore's law. Currently, the development of excitonic devices, where exciton flow is controlled, is mainly focused on electric-field modulation or exciton polaritons in high-Q cavities. Here, we show an all-optical strategy to manipulate the exciton flow in a binary colloidal quantum well complex through mediation of the Förster resonance energy transfer (FRET) by stimulated emission. In the spontaneous emission regime, FRET naturally occurs between a donor and an acceptor. In contrast, upon stronger excitation, the ultrafast consumption of excitons by stimulated emission effectively engineers the excitonic flow from the donors to the acceptors. Specifically, the acceptors' stimulated emission significantly accelerates the exciton flow, while the donors' stimulated emission almost stops this process. On this basis, a FRET-coupled rate equation model is derived to understand the controllable exciton flow using the density of the excited donors and the unexcited acceptors. The results will provide an effective all-optical route for realizing excitonic devices under room temperature operation.
ISSN: 2095-5545
DOI: 10.1038/s41377-020-0262-7
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: The Photonics Institute
Centre of Excellence for Semiconductor Lighting and Displays
Research Centres: Research Techno Plaza 
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
Appears in Collections:EEE Journal Articles

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