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Title: Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals

Abstract

Optical upconversion via sensitized triplet–triplet exciton annihilation converts incoherent low-energy photons to shorter wavelengths under modest excitation intensities1,2,3. Here, we report a solid-state thin film for infrared-to-visible upconversion that employs lead sulphide colloidal nanocrystals as a sensitizer. Upconversion is achieved from pump wavelengths beyond λ = 1 μm to emission at λ = 612 nm. When excited at λ = 808 nm, two excitons in the sensitizer are converted to one higher-energy state in the emitter at a yield of 1.2 ± 0.2%. Peak efficiency is attained at an absorbed intensity equivalent to less than one sun. We demonstrate that colloidal nanocrystals are an attractive alternative to existing molecular sensitizers, given their small exchange splitting, wide wavelength tunability, broadband infrared absorption, and our transient observations of efficient energy transfer. This solid-state architecture for upconversion may prove useful for enhancing the capabilities of solar cells and photodetectors.

Authors:
ORCiD logo; ; ORCiD logo; ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1387500
DOE Contract Number:  
SC0001088
Resource Type:
Journal Article
Journal Name:
Nature Photonics
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Related Information: CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University; Journal ID: ISSN 1749-4885
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solar (photovoltaic), solid state lighting, photosynthesis (natural and artificial), charge transport, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)

Citation Formats

Wu, Mengfei, Congreve, Daniel N., Wilson, Mark W. B., Jean, Joel, Geva, Nadav, Welborn, Matthew, Van Voorhis, Troy, Bulović, Vladimir, Bawendi, Moungi G., and Baldo, Marc A. Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals. United States: N. p., 2015. Web. doi:10.1038/nphoton.2015.226.
Wu, Mengfei, Congreve, Daniel N., Wilson, Mark W. B., Jean, Joel, Geva, Nadav, Welborn, Matthew, Van Voorhis, Troy, Bulović, Vladimir, Bawendi, Moungi G., & Baldo, Marc A. Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals. United States. doi:10.1038/nphoton.2015.226.
Wu, Mengfei, Congreve, Daniel N., Wilson, Mark W. B., Jean, Joel, Geva, Nadav, Welborn, Matthew, Van Voorhis, Troy, Bulović, Vladimir, Bawendi, Moungi G., and Baldo, Marc A. Mon . "Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals". United States. doi:10.1038/nphoton.2015.226.
@article{osti_1387500,
title = {Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals},
author = {Wu, Mengfei and Congreve, Daniel N. and Wilson, Mark W. B. and Jean, Joel and Geva, Nadav and Welborn, Matthew and Van Voorhis, Troy and Bulović, Vladimir and Bawendi, Moungi G. and Baldo, Marc A.},
abstractNote = {Optical upconversion via sensitized triplet–triplet exciton annihilation converts incoherent low-energy photons to shorter wavelengths under modest excitation intensities1,2,3. Here, we report a solid-state thin film for infrared-to-visible upconversion that employs lead sulphide colloidal nanocrystals as a sensitizer. Upconversion is achieved from pump wavelengths beyond λ = 1 μm to emission at λ = 612 nm. When excited at λ = 808 nm, two excitons in the sensitizer are converted to one higher-energy state in the emitter at a yield of 1.2 ± 0.2%. Peak efficiency is attained at an absorbed intensity equivalent to less than one sun. We demonstrate that colloidal nanocrystals are an attractive alternative to existing molecular sensitizers, given their small exchange splitting, wide wavelength tunability, broadband infrared absorption, and our transient observations of efficient energy transfer. This solid-state architecture for upconversion may prove useful for enhancing the capabilities of solar cells and photodetectors.},
doi = {10.1038/nphoton.2015.226},
journal = {Nature Photonics},
issn = {1749-4885},
number = 1,
volume = 10,
place = {United States},
year = {2015},
month = {11}
}

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