城戸・笹部・千葉研究室M2 星京吾さんと笹部久宏准教授の高効率青緑色βジケトン誘導体 TADF 材料群の論文が英国化学会 (Royal Society of Chemistry) の  J. Mater. Chem. C (IF: 6.4)  に受理されました。

本研究は、JSPS 科研費（基盤研究B, 20H02807, 23H02032）の助成を受けたものです。

Title: Bluish-green-to-green thermally activated delayed fluorescent emitters based on β-diketone derivatives exhibiting a horizontal emission dipole orientation ratio of 88% and an external quantum efficiency of nearly 25%
By Keigo Hoshi, Hisahiro Sasabe*, Ryoma Sato, Noto Yoshida, Yudai Chiba, Junji Kido*, J. Mater. Chem. C 2023, accepted.

Abstract: Despite the promising photofunctionalities of β-diketone-based thermally activated delayed fluorescent (TADF) emitters, such as excited-state intramolecular proton transfer and the utilization of the ligand in the emissive metal complex, examples in the blue region are scarcely explored. To achieve a shorter wavelength emission, three variations of beta-diketone/tetramethylcarbazole conjugated TADF emitters, designated as MCzX derivatives, were synthesized, and showed bluish-green-to green emission. Among these emitters, MCzDBM exhibited a photoluminescent quantum yield of 79% and a horizontal emission dipole orientation ratio of 88%, when incorporated into a phosphine-oxide-based host material, mCPPO. The consequent OLED has been evaluated to be highly efficient, with an external quantum efficiency of 24.6%. These performance parameters are the best among those reported thus far for β-diketone-based TADF emitters.

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