Nanocrystal-Sensitized Infrared-to-Visible Upconversion in a Microcavity under Subsolar Flux
Name
acs.nanolett.0c04060.pdf
Description
Published version
Size
1.73 MB
Format
Adobe PDF
Checksum (MD5)
c028c312b39277145c853ac4df2f5a22
Author(s)
Wu, Mengfei
Lin, Ting-An
Tiepelt, Jan O
Bulović, Vladimir
Baldo, Marc A
Date Issued
2021
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Wu, Mengfei, Lin, Ting-An, Tiepelt, Jan O, Bulović, Vladimir and Baldo, Marc A. 2021. "Nanocrystal-Sensitized Infrared-to-Visible Upconversion in a Microcavity under Subsolar Flux." Nano Letters, 21 (2).
Version
Final published version
Abstract
Infrared-to-visible photon upconversion could benefit applications such as photovoltaics, infrared sensing, and bioimaging. Solid-state upconversion based on triplet exciton annihilation sensitized by nanocrystals is one of the most promising approaches, albeit limited by relatively weak optical absorption. Here, we integrate the upconverting layers into a Fabry-Pérot microcavity with quality factor Q = 75. At the resonant wavelength λ = 980 nm, absorption increases 74-fold and we observe a 227-fold increase in the intensity of upconverted emission. The threshold excitation intensity is reduced by 2 orders of magnitude to a subsolar flux of 13 mW/cm2. We measure an external quantum efficiency of 0.06 ± 0.01% and a 2.2-fold increase in the generation yield of upconverted photons. Our work highlights the potential of triplet-triplet annihilation-based upconversion in low-intensity sensing applications and demonstrates the importance of photonic designs in addition to materials engineering to improve the efficiency of solid-state upconversion.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licens
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DOI of Published Version
https://doi.org/10.1021/ACS.NANOLETT.0C04060
