All-optical control of exciton flow in a colloidal quantum well complex

Junhong Yu; Manoj Sharma; Ashma Sharma; Savas Delikanli; Hilmi Volkan Demir; Cuong Dang

doi:10.1038/s41377-020-0262-7

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All-optical control of exciton flow in a colloidal quantum well complex

Article

- All-optical control of exciton flow in a colloidal quantum well complex
- Light: Science & Applications Vol. 9, Issue 2, Pages: 266-273(2020)
- Affiliations：
  
  1.LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, The Photonics Institute (TPI), Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
  2.Department of Electrical and Electronics Engineering and Department of Physics, UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Bilkent, 06800 Ankara, Turkey
  3.School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Nanyang Technological University, 639798 Singapore, Singapore
  4.CINTRA UMI CNRS/NTU/THALES 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, 637553 Singapore, Singapore
- Author bio：
  
  Hilmi Volkan Demir (volkan@stanfordalumni.org)
  Cuong Dang (hcdang@ntu.edu.sg)
- Funds：
- DOI：10.1038/s41377-020-0262-7
  CLC：
- Published：2020，
  
  Published Online：27 February 2020，
  
  Received：04 November 2019，
  
  Revised：11 February 2020，
  
  Accepted：12 February 2020
- Accepted：
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Yu, J. H. et al. All-optical control of exciton flow in a colloidal quantum well complex. Light: Science & Applications, 9, 266-273 (2020).
DOI：

Yu, J. H. et al. All-optical control of exciton flow in a colloidal quantum well complex. Light: Science & Applications, 9, 266-273 (2020). DOI： 10.1038/s41377-020-0262-7.

摘要

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 Fo?rster 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.

关键词

Keywords

references

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