Highly efficient blue TADF emitters incorporating bulky acridine moieties and their application in solution-processed OLEDs

Versatile boron‐based thermally activated delayed fluorescence materials for organic light‐emitting diodes

“…Nondoped solution-processed blue OLEDs using compounds 18 and 19 as emitting layer were fabricated and exhibited EL peak of 463 nm and 474 nm, and CIE coordinates of (0.15, 0.17 [48] triarylboron-based TADF molecules (20 and 21) by employing multiple donors with mild donating abilities and suitable numbers. [49] The utilization of 9,9-diphenyl-9,10dihydroacridine and 10H-spiro[acridine-9,9′-fluorene] as electron donors endowed molecules 20 and 21 with rigid structures. 20 and 21 showed blue emission peaking at 464 and 479 nm in doped films, accompanied with high PLQYs of over 70%.…”

1,4-Bis(trifluoromethyl)benzene as a new acceptor for the design and synthesis of emitters exhibiting efficient thermally activated delayed fluorescence and electroluminescence: experimental and computational guidance

“…The structures of the synthesized compounds, except that of 2PO-2CF 3 Ph, were confirmed by 1 H and 13 C NMR spectroscopy. It was not possible to confirm the structure of 2PO-2CF 3 Ph by 1 H and 13 C NMR due to solubility problems in all available deuterated solvents. However, we were able to confirm the structure by single crystal X-ray analysis.…”

“…As a result, different combinations of donors and acceptors have been explored in the design of TADF emitters. Common donors are carbazole, [5][6][7] phenoxazine, [8][9][10] phenothiazine, 11,12 and 9,9-dimethyl-9-10-dihydroacridine, [13][14][15] while common acceptors are triphenyltriazine, 9,[16][17][18] sulfonyl groups, 19,20 and cyano groups. 21,22 Cyano and sulfonyl groups are strong electron-withdrawing moieties.…”

Zinc (II) and AIEgens: The “Clip Approach” for a Novel Fluorophore Family. A Review

“…In 2016, Hiroshi Nishihara [ 100 ] and coworkers studied the solid-state PL emission of seven encumbered tetradentate bis(dipyrrinato)zinc (II) complexes. The bulky effect [ 101 , 102 , 103 ] due to the meso-aryl group in the dipyrrin ligands proved to affect the emissive properties of the dipyrrin Zn(II) complexes. The conformation of the meso-aryl group in the excited state greatly affects the nonradiative decay pathways.…”