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Direct band gap white light emission from charge carrier diffusion induced nanowire light-emitting diodes

Zhao, Yue LU ; Adham, Kristi LU ; Hessman, Dan LU and Borgström, Magnus T. LU orcid (2024) In Nano Energy 132.
Abstract

Light-emitting diodes (LEDs) have been investigated during the past decades, for which a major challenge is total internal reflection that limits the light extraction efficiency. ‘Nanotree’ LEDs elegantly solve this bottleneck. Lower band gap nanowire branches are grown on higher band gap core wires. Charge carriers diffuse into the branches and recombine there. Total internal reflection is impeded since the branch diameter is much smaller than the wavelength of light emitted from the material. Our ‘nanotree’ LEDs show direct band gap emission with color corresponding to the semiconductor materials composition. By stronger biasing of the core wires, we provoke white light emission without down-converting phosphors. The concept of... (More)

Light-emitting diodes (LEDs) have been investigated during the past decades, for which a major challenge is total internal reflection that limits the light extraction efficiency. ‘Nanotree’ LEDs elegantly solve this bottleneck. Lower band gap nanowire branches are grown on higher band gap core wires. Charge carriers diffuse into the branches and recombine there. Total internal reflection is impeded since the branch diameter is much smaller than the wavelength of light emitted from the material. Our ‘nanotree’ LEDs show direct band gap emission with color corresponding to the semiconductor materials composition. By stronger biasing of the core wires, we provoke white light emission without down-converting phosphors. The concept of nanoscale-enhanced charge carrier diffusion LEDs may be a game changer for industrial LED design.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electroluminescence, External quantum efficiency, Nanowire light-emitting diodes, Total internal reflection
in
Nano Energy
volume
132
article number
110400
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85207649107
ISSN
2211-2855
DOI
10.1016/j.nanoen.2024.110400
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 The Authors
id
bc27119c-e1be-4210-9859-36fd9fe30e87
date added to LUP
2024-11-27 21:42:49
date last changed
2025-04-04 13:51:35
@article{bc27119c-e1be-4210-9859-36fd9fe30e87,
  abstract     = {{<p>Light-emitting diodes (LEDs) have been investigated during the past decades, for which a major challenge is total internal reflection that limits the light extraction efficiency. ‘Nanotree’ LEDs elegantly solve this bottleneck. Lower band gap nanowire branches are grown on higher band gap core wires. Charge carriers diffuse into the branches and recombine there. Total internal reflection is impeded since the branch diameter is much smaller than the wavelength of light emitted from the material. Our ‘nanotree’ LEDs show direct band gap emission with color corresponding to the semiconductor materials composition. By stronger biasing of the core wires, we provoke white light emission without down-converting phosphors. The concept of nanoscale-enhanced charge carrier diffusion LEDs may be a game changer for industrial LED design.</p>}},
  author       = {{Zhao, Yue and Adham, Kristi and Hessman, Dan and Borgström, Magnus T.}},
  issn         = {{2211-2855}},
  keywords     = {{Electroluminescence; External quantum efficiency; Nanowire light-emitting diodes; Total internal reflection}},
  language     = {{eng}},
  month        = {{12}},
  publisher    = {{Elsevier}},
  series       = {{Nano Energy}},
  title        = {{Direct band gap white light emission from charge carrier diffusion induced nanowire light-emitting diodes}},
  url          = {{http://dx.doi.org/10.1016/j.nanoen.2024.110400}},
  doi          = {{10.1016/j.nanoen.2024.110400}},
  volume       = {{132}},
  year         = {{2024}},
}