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Heavy metal-free visible-to-UV photon upconversion with over 20% efficiency sensitized by a ketocoumarin derivative

16 November 2021, Version 1
Working Paper
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Efficient triplet-triplet annihilation-based photon upconversion (TTA-UC) from visible to UV light without using heavy metals is still a challenging task. Here we achieve a record-high TTA-UC efficiency of 20.3% among 100% maximum by employing a ketocoumarin derivative as a triplet sensitizer, which shows strong visible absorption, weak UV absorption, and efficient intersystem crossing.

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Title
Heavy metal-free visible-to-UV photon upconversion with over 20% efficiency sensitized by a ketocoumarin derivative
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Version History

Nov 16, 2021 Version 1

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The content is available under CC BY NC ND 4.0 [opens in a new tab]

DOI

10.26434/chemrxiv-2021-3jhbh
D O I: 10.26434/chemrxiv-2021-3jhbh [opens in a new tab]

Funding

JSPS KAKENHI
JP20H02713, JP20K21211, JP20H05676, JP21J21739
GAP NEXT program
KYUTEC research and development grant
the Innovation inspired by Nature Program of Sekisui Chemical Co. Ltd.

Author’s competing interest statement

The author(s) have declared they have no conflict of interest with regard to this content

Ethics

The author(s) have declared ethics committee/IRB approval is not relevant to this content

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