1542992-98-2Relevant articles and documents
Syntheses, photoluminescence and electroluminescence of four heteroleptic iridium complexes with 2-(5-phenyl-1,3,4-oxadiazol-2-yl)-phenol derivatives as ancillary ligands
Li, Hong-Yan,Li, Tian-Yi,Teng, Ming-Yu,Xu, Qiu-Lei,Zhang, Song,Jin, Yi-Ming,Liu, Xuan,Zheng, You-Xuan,Zuo, Jing-Lin
, p. 1116 - 1124 (2014/02/14)
Four new iridium(iii) cyclometalated complexes (Ir1-Ir4) with 4-trifluoromethylphenylpyridine as the main ligand and 2-(5-phenyl-1,3,4- oxadiazol-2-yl)-phenol and its fluoro/trifluoromethyl substituted derivatives as ancillary ligands have been developed. All complexes are green phosphors (λmax = 519-537 nm) with photoluminescence quantum efficiency yields of 10-53% in CH2Cl2 solutions at room temperature, respectively. The organic light emitting diodes (OLEDs) with the structure of ITO/TAPC (1,1-bis[4-(di-p-tolylamino)phenyl]cyclohexane, 60 nm)/Ir complexes (8 wt%):SimCP2 (bis[3,5-di(9H-carbazol-9-yl)phenyl] diphenylsilane, 30 nm)/TPBi (1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl, 90 nm)/LiF (1 nm)/Al (100 nm) show good performances. In particular, device G4 based on complex Ir4 (2-(5-pentafluorophenyl-1,3,4-oxadiazol-2-yl)-phenol as ancillary ligand) showed superior performances with a peak current efficiency (ηc) of 70.48 cd A-1 and a peak external quantum efficiency (ηext, EQE) of 19.7%. This study demonstrates that the ancillary ligand attached with the 1,3,4-oxadiazole group could facilitate charge trapping across the bulk of the device for efficient OLEDs.
