笹部研究室の 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.

https://hisahirosasabe.yz.yamagata-u.ac.jp/archives/428