Abstract
A new series of red to near-infrared phosphorescent complexes, (pypt)2Ir(acac), (sqpt)2Ir(acac) and (qupt)2Ir(acac), based on 2-(phenanthren-9-yl)pyridine (pyptH), 1-(phenanthren-9-yl) isoquinoline (sqptH) and quinoxalino[2,3-> l ]phenanthrene (quptH) as ligands were synthesized. The absorption, luminescence and electrochemical properties of these complexes showed that LUMO energy level significantly decreased with π-conjugate extension of the substitutes on phenanthrene ring, but neglectable affection for HOMO energy level. The π-conjugate extension of the ligand in complexes results in red-shift in absorption and emission of complexes. The complexes exhibited intense phosphorescence in room temperature, with λmax = 619 nm for (pypt)2Ir(acac), 690 nm for (sqpt)2Ir(acac) and 704 nm for (qupt)2Ir(acac). Red to near infrared phosphorescent organic light-emitting diodes were fabricated by doping 4% (sqpt)2Ir(acac) into host of PVK and PBD. EL spectra had λmax at 704 nm, and extend into near infrared region.
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