Harada Naoyuki, Sasaki Yoichi, Hosoyamada Masanori, Kimizuka Nobuo, Yanai Nobuhiro
Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan.
PRESTO, JST, Honcho 4-1-8, Kawaguchi, Saitama, 332-0012, Japan.
Angew Chem Int Ed Engl. 2021 Jan 4;60(1):142-147. doi: 10.1002/anie.202012419. Epub 2020 Nov 24.
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) (acac), a superior donor that does not quench UV emission. The combination of TIPS-Nph and Ir(C6) (acac) realizes the efficient UV light production even with weak light sources such as an AM 1.5 solar simulator and room LEDs.
虽然已经对基于三重态-三重态湮灭的光子上转换（TTA-UC）进行了许多研究以高效产生可见光，但从可见光到紫外光的高效TTA-UC尽管对各种太阳能和室内应用很重要，仍然是一项具有挑战性的任务。在此，我们基于发现一种出色的紫外发射体1,4-双（（三异丙基甲硅烷基）乙炔基）萘（TIPS-Nph），报告了高达20.5%的从可见光到紫外光的TTA-UC效率。TIPS-Nph是一种受体，具有高荧光量子产率和通过TTA产生高单线态效率的理想特性。TIPS-Nph具有足够低的三重态能级，可被Ir(C6)(acac)敏化，Ir(C6)(acac)是一种不会淬灭紫外发射的优质供体。TIPS-Nph和Ir(C6)(acac)的组合即使使用诸如AM 1.5太阳模拟器和室内LED等弱光源也能实现高效的紫外光产生。
