Syntheses, Photoluminescence, and Electroluminescence of Iridium(III) Complexes with Fluorinated 2‐Phenylpyridine as Main Ligands and Tertraphenylimidodiphosphinate as Ancillary Ligand

摘要: Three green-emitting heteroleptic iridium complexes with 2-(4,5,6-trifluorophenyl)pyridine, 2-(3,4,6-trifluorophenyl)pyridine, and 2-(3,4,5-trifluorophenyl)pyridine as main ligands tetraphenylimidodiphosphinate (tpip) the ancillary ligand were synthesized characterized. The positions of three fluorine atoms on phenyl ring affect emission properties complexes, application Htpip improves electron mobility to make it comparable that popular transport material tris(8-hydroxyquinolinato)aluminium (Alq3) under same electric fields. organic light-emitting diodes (OLEDs) based above phosphorescent emitters {indium tin oxide (ITO)/1,1-bis[4-(di-p-tolyl-amino)phenyl]cyclohexane (TAPC), 30 nm/Ir complex (x wt.-%)/N,N′-dicarbazolyl-3,5-benzene (mCP), 15 nm/1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl (TPBi), 45 nm/LiF (1 nm)/Al (100 nm)} exhibited good performances. device doped bis[2-(3,4,6-trifluorophenyl)pyridine](tetraphenylimidodiphosphinato)iridium [Ir(F3,4,6ppy)2(tpip)] (8 wt.-%) showed superior performance a peak current efficiency (ηc) 66.36 cd A–1 external quantum (ηext, EQE) 25.7 % at 5.8 V, maximum power (ηp) 48.20 lm W–1 4.4 luminance (Lmax) 47627 cd m–2 12.6 V. Notably, electroluminescence (EL) roll-off effects relatively high density in all devices are very mild, which helps them obtain brightness. results suggest especially, would have potential applications OLEDs.