M2 星京吾君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！星、おめでとう！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。
Abstract: Despite the promising photofunctionalities of beta-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 beta-diketone-based TADF emitters.
