城戸・笹部・千葉研究室M2 松家美咲さん（Ms. Misaki Matsuya）と笹部久宏准教授の高効率塗布型有機ELを実現するβ-ジケトン配位子を有する遅延蛍光性アルミニウム錯体に関する論文が日本化学会の Bull Chem Soc JPN (IF: 5.121) の優秀論文に選出されました。

本研究は、 JSPS 科研費（基盤研究B, 20H02807）、JST センター・オブ・イノベーションプログラム（COI）の助成を受けたものです。また、山形大学の片桐先生には量子化学計算、京都大学の渡邊雄一郎先生には質量分析測定の協力をしていただきました。ありがとうございました！

Title: Highly luminescent aluminum complex with β-diketone ligands exhibiting near-unity photoluminescence quantum yield, thermally activated delayed fluorescence, and rapid radiative decay rate properties in solution-processed organic light-emitting devices
By Misaki Matsuya, Hisahiro Sasabe*, Shunsuke Sumikoshi, Keigo Hoshi, Kohei Nakao, Kengo Kumada, Ryo Sugiyama, Ryoma Sato, Junji Kido, Bull. Chem. Soc. JPN 2023, 96, 183-189.

Abstract: A highly luminescent mononuclear Al complex with β-diketone ligands exhibiting superior thermally activated delayed fluorescence (TADF) properties was developed in this work. The complex showed yellow emission with promising photofunctions, including a near-unity photoluminescence quantum yield (PLQY), a rapid radiative decay rate, and a short delayed fluorescence lifetime in the solid state. When applied in a solution-processed organic light-emitting device, an external quantum efficiency (EQE) exceeding 18% and a low turn-on voltage of 2.9 V at 1 cd/m2 were obtained, surpassing those of the corresponding β-diketone ligand. Metal complexation with Al generated unique electronic structures that significantly strengthened the photofunctions of the original β-diketone ligand in the solid state.

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