| 초록 |
Achieving deep blue phosphorescence with high efficiency and brightness, together with long-term operational stability, remains a significant challenge. Improvement of the stability of blue phosphorescent dopant material is one of the key factor for real application of organic light-emitting diodes. In particular, imidazole ligand of Ir(III) complex tend to play an important role in the stability of blue phosphorescence. In addition, N-heterocyclic carbene (NHC) ligands, or Ir(C∧C:)3 known for thermodynamically stable. Here, we focus on the stable blue phosphorescent emitters. We design and synthesis of some cyclometalated iridium complexes containing imidazole-type ligands: Iridium, tris[3,4-X(3-methyl-1H-imidazol-1-yl-2(3H)-ylidene)], (X=dibenzofurandiyl, phenylene, dibenzothiophenediyl, 9,9-dimethyl-9H-fluorene-3,2-diyl, 4-methylbenzothiadiazolediyl). We report a study of the photophysical properties of 5 cyclometalated Ir carbene complexes series. |
