title: Aggregation-Induced Delayed Fluorescence Based on Donor/Acceptor-Tethered Janus Carborane Triads: Unique Photophysical Properties of Nondoped OLEDs.
abstract: Luminescent materials consisting of boron clusters, such as carboranes, have attracted immense interest in recent years. In this study, luminescent organic-inorganic conjugated systems based on o-carboranes directly bonded to electron-donating and electron-accepting π-conjugated units were elaborated as novel optoelectronic materials. These o-carborane derivatives simultaneously possessed aggregation-induced emission (AIE) and thermally activated delayed fluorescence (TADF) capabilities, and showed strong yellow-to-red emissions with high photoluminescence quantum efficiencies of up to 97 % in their aggregated states or in solid neat films. Organic light-emitting diodes utilizing these o-carborane derivatives as a nondoped emission layer exhibited maximum external electroluminescence quantum efficiencies as high as 11 %, originating from TADF.
authors.affiliation: INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.|Department of Automotive Science, Graduate School of Integrated Frontier Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Ryuhei
authors.initials: R
authors.lastname: Furue
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Takuro
authors.initials: T
authors.lastname: Nishimoto
authors.affiliation: INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.|Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: In Seob
authors.initials: IS
authors.lastname: Park
authors.affiliation: INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.|Department of Automotive Science, Graduate School of Integrated Frontier Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Lee
authors.affiliation: INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. yasuda@ifrc.kyushu-u.ac.jp.|Department of Automotive Science, Graduate School of Integrated Frontier Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. yasuda@ifrc.kyushu-u.ac.jp.|Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. yasuda@ifrc.kyushu-u.ac.jp.
authors.forename: Takuma
authors.initials: T
authors.lastname: Yasuda
keywords: carboranes; delayed fluorescence; organic light-emitting diodes; photophysical properties; semiconductors