Abstract
Two near-infrared- (NIR-) emitting cationic iridium(III) complexes, [Ir(pbq-g)2(Bphen)]+PF6– (1) and [Ir(mpbqx-g)2(Bphen)]+PF6– (2), were synthesized and characterized, where pbq-g, mpbqx-g, and Bphen represent phenylbenzo[g]quinoline, 2-methyl-3-phenylbenzo[g]quinoxaline, and 4,7-diphenyl-1,10-phenanthroline, respectively. By employing sp2-hybridized N opposite the chelating N atom in the cyclometalated ligand, we succeeded in expanding the emission of iridium complexes with simple structures to the truly NIR region of the spectrum. This subtle structural adjustment significantly lowered the LUMOs of the iridium complexes, leading to a 60–80-nm emission red shift of complex 2 relative to complex 1. Based on these solution-processable phosphors, NIR organic light-emitting devices (OLEDs) were fabricated with the emission covering the range 690–850 nm. Compared with common OLEDs, these NIR-emitting electrophosphorescent devices demonstrate exclusive small efficiency roll-off with increasing current density...
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