@article{1879e11b239949ddae78d96d2dfdb562,
title = "Heavy metal-free visible-to-UV photon upconversion with over 20% efficiency sensitized by a ketocoumarin derivative",
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.",
author = "Masanori Uji and Naoyuki Harada and Nobuo Kimizuka and Masaki Saigo and Kiyoshi Miyata and Ken Onda and Nobuhiro Yanai",
note = "Funding Information: This work was partly supported by JSPS KAKENHI (grant numbers JP20H02713, JP20K21211, JP20H05676, JP21J21739), GAP NEXT program, KYUTEC research and development grant, and the Innovation inspired by Nature Program of Sekisui Chemical Co. Ltd. Publisher Copyright: {\textcopyright} 2022 The Royal Society of Chemistry",
year = "2022",
month = jan,
day = "10",
doi = "10.1039/d1tc05526g",
language = "English",
volume = "10",
pages = "4558--4562",
journal = "Journal of Materials Chemistry C",
issn = "2050-7526",
publisher = "Royal Society of Chemistry",
number = "12",
}