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Ultrafast Infrared-to-Visible Photon Upconversion on Plasmon/TiO2 Solid Films

Zou, Xianshao ; Bericat Vadell, Robert ; Cai, Bin ; Geng, Xinjian ; Dey, Ananta ; Liu, Yawen ; Gudmundsson, Axel ; Meng, Jie LU and Sá, Jacinto (2023) In Journal of Physical Chemistry Letters 14(27). p.6255-6262
Abstract

Optical upconversion via a multiphoton absorption process converts incoherent low-energy photons to shorter wavelengths. In this contribution, we report a solid-state thin film for infrared-to-visible upconversion composed of plasmonic/TiO2 interfaces. When excited at λ = 800 nm, three photons are absorbed, leading to the excitation of TiO2 trap states into an emissive state in the visible domain. The plasmonic nanoparticle enhances the light absorption capabilities of the semiconductor, increasing emission efficiency by 20 times. We demonstrate that the plasmonic nanoparticle only changes the optical absorption of the semiconductor; i.e., the process is purely photonic. The process occurs in the ultrafast domain... (More)

Optical upconversion via a multiphoton absorption process converts incoherent low-energy photons to shorter wavelengths. In this contribution, we report a solid-state thin film for infrared-to-visible upconversion composed of plasmonic/TiO2 interfaces. When excited at λ = 800 nm, three photons are absorbed, leading to the excitation of TiO2 trap states into an emissive state in the visible domain. The plasmonic nanoparticle enhances the light absorption capabilities of the semiconductor, increasing emission efficiency by 20 times. We demonstrate that the plasmonic nanoparticle only changes the optical absorption of the semiconductor; i.e., the process is purely photonic. The process occurs in the ultrafast domain (<10 ps), contrasting with molecular triplet-triplet exciton annihilation, the commonly used method in photon upconversion, in the nano- to microsecond time scales. The process utilizes pre-existing trap states within the semiconductor bandgap and involves three-photon absorption.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
14
issue
27
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:37390337
  • scopus:85164625907
ISSN
1948-7185
DOI
10.1021/acs.jpclett.3c01208
language
English
LU publication?
yes
id
58a20ff3-456e-4484-8170-58055cad1bbb
date added to LUP
2023-10-06 13:12:26
date last changed
2024-04-19 02:02:01
@article{58a20ff3-456e-4484-8170-58055cad1bbb,
  abstract     = {{<p>Optical upconversion via a multiphoton absorption process converts incoherent low-energy photons to shorter wavelengths. In this contribution, we report a solid-state thin film for infrared-to-visible upconversion composed of plasmonic/TiO<sub>2</sub> interfaces. When excited at λ = 800 nm, three photons are absorbed, leading to the excitation of TiO<sub>2</sub> trap states into an emissive state in the visible domain. The plasmonic nanoparticle enhances the light absorption capabilities of the semiconductor, increasing emission efficiency by 20 times. We demonstrate that the plasmonic nanoparticle only changes the optical absorption of the semiconductor; i.e., the process is purely photonic. The process occurs in the ultrafast domain (&lt;10 ps), contrasting with molecular triplet-triplet exciton annihilation, the commonly used method in photon upconversion, in the nano- to microsecond time scales. The process utilizes pre-existing trap states within the semiconductor bandgap and involves three-photon absorption.</p>}},
  author       = {{Zou, Xianshao and Bericat Vadell, Robert and Cai, Bin and Geng, Xinjian and Dey, Ananta and Liu, Yawen and Gudmundsson, Axel and Meng, Jie and Sá, Jacinto}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  number       = {{27}},
  pages        = {{6255--6262}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{Ultrafast Infrared-to-Visible Photon Upconversion on Plasmon/TiO<sub>2</sub> Solid Films}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.3c01208}},
  doi          = {{10.1021/acs.jpclett.3c01208}},
  volume       = {{14}},
  year         = {{2023}},
}