城戸・笹部・千葉研究室M2 星圭吾君と笹部久宏准教授の高効率・狭半値幅塗布型有機 EL を実現する遅延蛍光性アルミニウム錯体増感剤の論文が Wiley の Advanced Optical Materials (IF: 9.0) に受理されました。本研究は山形大学片桐研究室との共同研究です。

Title: Ubiquitous Aluminum(III)-TADF Complex as Sensitizer for Highly Efficient Solution-Processed Hyperfluorescent OLEDs with Narrow Emission
By Keigo Hoshi, Hisahiro Sasabe,* Yudai Chiba, Naoto Yoshida, Takeru Nakamura, Keisuke Nagasawa, Yuya Sayama, Hiroshi Katagiri, and Junji Kido, Adv. Opt. Mater. accepted.

Abstract: Although earth-abundant, ubiquitous, metal-based thermally activated delayed fluorescence (TADF) complexes are among the most promising candidates as next-generation organic light-emitting devices (OLEDs), only a limited number of complexes have been explored to date. In this study, we present a highly emissive aluminum(III)-TADF complex, Al(MCzDBM)3 with three beta-diketone ligands, as a sensitizer for multiresonance (MR)-TADF emitters. This complex exhibited green emission with remarkable photophysical functions, such as a high photoluminescent quantum yield (PLQY) of up to 97% with reduced aggregation caused quenching, a rapid radiative rate constant (kr) of 5.6 x 107 s-1, and a short delayed lifetime (t_d) of 4.0 μs in the solid state. The solution-processed Al(MCzDBM)3-based OLED exhibited an external quantum efficiency (EQE) of 23.6%. This complex sensitized the yellow MR-TADF emitter yielding a near-unity PLQY, and realizing a solution-processed hyper-OLED with an EQE of 21.6% and full width at half maximum of 45 nm. 

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