Red phosphorescent iridium(III) complexes containing 2,3-diphenylquinoline derivatives for OLEDs

초록

For the application in organic light-emitting diodes (OLEDs), the efficient new red phosphorescent iridium(III) complexes, bis[2,3-diphenyl-4-methyl-quinolinato-C-2,N] iridium(III) acetylacetonate [Ir(4-Me-2,3-dpq)(2)(acac)] and bis[2,3-di(4-methoxy-phenyl)-4-methyl-quinolinato-C-2,N] iridium(III) acetylacetonate [Ir(4-Me-2,3-dpq(OMe)(2))(2)(acac)] were synthesized from the two-step reactions of IrCl3 center dot xH(2)O with the corresponding ligand. The complexes were characterized by mass spectrometry and H-1 NMR. In the photolurninescence (PL) spectra, Ir(4-Me-2,3-dpq)(2)(acac) and Ir(4-Me-2,3-dpq(OMe)(2))(2)(acac) exhibited the luminescence peak at 604 and 592 nm, respectively. Their electroluminescent (EL) devices with a configuration of ITO/2-TNATA/NPB/CBP:dopanUBCP/AlQ(3)/Liq/Al were fabricated. Ir(4-Me-2,3-dpq)(2)(acac) and Ir(4-Me-2,3-dpq(OMe)(2))(2)(acac) showed the luminous efficiency of 8.10 cd/A and 9.81 cd/A at J of 20 mA/cm(2), respectively. The Commission Internationale de L'Eclairage (CIE) coordinates of Ir(4-Me-2,3-dPq)(2)(acac) and Ir(4-Me-2,3-dpq(OMe)(2))(2) (acac) were (0.644, 0.352) and (0.615, 0.375), respectively. (c) 2007 Elsevier B.V. All rights reserved.

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