C 1-Symmetrical [Ir(C^N1)(C^N2)(N^O)]-tris-heteroleptic Ir(iii)-complexes with one strong N^O-ancillary π-donor for efficient all-solution-processed near-infrared (NIR) polymer light-emitting diodes (PLEDs)

Upon the usage of Ba/Al instead of LiF/Al, [Ir(iqbt)(btp)(pbi)] exhibited an attractive η MaxEQE of 4.24% for its reliable all-solution-processed NIR-PLEDs.