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A bis-cyclometalated iridium complex as a benchmark sensitizer for efficient visible-to-UV photon upconversion
Pengfei Duan1, Nobuhiro Yanai, Nobuo Kimizuka
1Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan. yanai@mail.cstm.kyushu-u.ac.jp n-kimi@mail.cstm.kyushu-u.ac.jp.
Abstract:
To resolve the biggest problem in visible-to-UV photon upconversion based on sensitized triplet-triplet annihilation-the quenching of upconverted fluorescence by sensitizers-we discovered a superior sensitizer with less UV absorption intensity that enables highly efficient, low-power (0.78 mW cm(-2)) visible-to-UV upconversion.
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