Issue 12, 2022
From the journal:

Journal of Materials Chemistry C

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

Masanori Uji,a   Naoyuki Harada,a   Nobuo Kimizuka, ORCID logo *a   Masaki Saigo,b   Kiyoshi Miyata,b   Ken Onda ORCID logo b  and  Nobuhiro Yanai ORCID logo *ac  

* Corresponding authors

a Department of Applied Chemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
E-mail: yanai@mail.cstm.kyushu-u.ac.jp, n-kimi@mail.cstm.kyushu-u.ac.jp

b Department of Chemistry, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan

c PRESTO, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan

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.

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

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Article information

DOI
https://doi.org/10.1039/D1TC05526G
Article type
Communication
Submitted
16 nov 2021
Accepted
05 jan 2022
First published
10 jan 2022

J. Mater. Chem. C, 2022,10, 4558-4562

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

M. Uji, N. Harada, N. Kimizuka, M. Saigo, K. Miyata, K. Onda and N. Yanai, J. Mater. Chem. C, 2022, 10, 4558 DOI: 10.1039/D1TC05526G

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