TY - JOUR
T1 - Discovery of Key TIPS-Naphthalene for Efficient Visible-to-UV Photon Upconversion under Sunlight and Room Light**
AU - Harada, Naoyuki
AU - Sasaki, Yoichi
AU - Hosoyamada, Masanori
AU - Kimizuka, Nobuo
AU - Yanai, Nobuhiro
N1 - Funding Information:
This work was partly supported by JSPS KAKENHI (grant numbers JP20H02713, JP16H06513, JP18J21140), the Sumitomo Foundation, the Ogasawara Foundation, and the Innovation inspired by Nature Program of Sekisui Chemical Co. Ltd.
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2021/1/4
Y1 - 2021/1/4
N2 - While many studies have been done on triplet–triplet annihilation-based photon upconversion (TTA-UC) to produce visible light with high efficiency, the efficient TTA-UC from visible to UV light, despite its importance for a variety of solar and indoor applications, remains a challenging task. Here, we report the highest visible-to-UV TTA-UC efficiency of 20.5 % based on the discovery of an excellent UV emitter, 1,4-bis((triisopropylsilyl)ethynyl)naphthalene (TIPS-Nph). TIPS-Nph is an acceptor with desirable features of high fluorescence quantum yield and high singlet generation efficiency by TTA. TIPS-Nph has a low enough triplet energy level to be sensitized by Ir(C6)2(acac), a superior donor that does not quench UV emission. The combination of TIPS-Nph and Ir(C6)2(acac) realizes the efficient UV light production even with weak light sources such as an AM 1.5 solar simulator and room LEDs.
AB - While many studies have been done on triplet–triplet annihilation-based photon upconversion (TTA-UC) to produce visible light with high efficiency, the efficient TTA-UC from visible to UV light, despite its importance for a variety of solar and indoor applications, remains a challenging task. Here, we report the highest visible-to-UV TTA-UC efficiency of 20.5 % based on the discovery of an excellent UV emitter, 1,4-bis((triisopropylsilyl)ethynyl)naphthalene (TIPS-Nph). TIPS-Nph is an acceptor with desirable features of high fluorescence quantum yield and high singlet generation efficiency by TTA. TIPS-Nph has a low enough triplet energy level to be sensitized by Ir(C6)2(acac), a superior donor that does not quench UV emission. The combination of TIPS-Nph and Ir(C6)2(acac) realizes the efficient UV light production even with weak light sources such as an AM 1.5 solar simulator and room LEDs.
UR - http://www.scopus.com/inward/record.url?scp=85096712441&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85096712441&partnerID=8YFLogxK
U2 - 10.1002/anie.202012419
DO - 10.1002/anie.202012419
M3 - Article
C2 - 33063410
AN - SCOPUS:85096712441
SN - 1433-7851
VL - 60
SP - 142
EP - 147
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 1
ER -