M1 千葉祐大君、笹部久宏准教授の「精密な電子準位の制御により高速な kRISC を実現する可溶性アルミニウム錯体 TADF 発光材料と緑色ハイパー有機EL」に関する論文が Wiley の Advanced Functional Materials (IF: 18.5) に受理されました！千葉、おめでとう！本研究は、山形大学片桐研究室との共同研究です。片桐先生、ご協力ありがとうございました。
本研究は、JSPS 科研費（基盤研究B 23H02032）の助成を受けたものです。
Title: Precisely Regulating the Electronic Structure Enables Highly Soluble, Luminescent, and Short-Delayed Aluminum(III)-TADF Complex for High-Performance Solution-Processed Green Hyperfluorescent OLEDs
By Yudai Chiba, Keigo Hoshi, Genki Yamda, Haruki Nemma, Riko Otomo, Dehao Jiang, Naoki Meguro, Hiroshi Katagiri, Junji Kido, and Hisahiro Sasabe*, Advanced Functional Materials, accepted.
Abstract: Ubiquitous metal complexes with superior thermally activated delayed fluorescence (TADF) properties have emerged as promising candidates for light-emitting materials due to their earth-abundant nature and tunable optoelectronic characteristics. However, metal complexation often results in unfavorable solubility issues, which limit their application in solution-processed OLEDs. Moreover, achieving a short-delayed lifetime (τd) is essential for further enhancing device performance with small efficiency roll-off. In this work, we present a highly soluble and luminescent aluminum(III) complex exhibiting exceptional TADF characteristics through precise regulation of their electronic structures. This complex demonstrates high solubility in common organic solvents while maintaining excellent photofunctional properties, such as PLQY values approaching unity, reduced aggregation-caused quenching (ACQ), radiative decay rate constants (kr) exceeding 107 s−1, impressive TADF performance with reverse intersystem crossing rates (kRISC) over 106 s−1 and τd below 1 μs. Consequently, a novel aluminum(III) complex used as a sensitizer achieved an external quantum efficiency exceeding 20%, a full width at half maximum of 52 nm, and CIE coordinates of (0.31, 0.64) in solution-processed hyperfluorescent OLEDs.
