Blue Phosphorescent Ir(III) Complex with High Color Purity: fac -Tris(2′,6′-difluoro-2,3′-bipyridinato- N,C 4′ )iridium(III)
2008; American Chemical Society; Volume: 48; Issue: 3 Linguagem: Inglês
10.1021/ic801643p
ISSN1520-510X
AutoresSeok‐Jong Lee, Ki‐Min Park, Kiyull Yang, Youngjin Kang,
Tópico(s)Conducting polymers and applications
ResumoA blue phosphorescent iridium(III) complex (1) bearing fluorine-substituted bipyridine (dfpypy) has been synthesized and characterized to investigate the effect of the substitution and replacement of the phenyl ring in ppy (phenylpyridine) with pyridine on the solid state structure and its photoluminescence. The optical properties and electrochemical behaviors of 1 have also been systematically evaluated. The structure of 1 has also been determined by a single-crystal X-ray diffraction analysis. There are varied intermolecular interactions caused by the pyridine and fluorine substituents, such as C−H···N, C−H···F, and π···π interactions of either face-to-face type or edge-to-face C−H···π and halogen···π in crystal packing. In electrochemistry, the remarkably higher oxidation potential than that of FIrpic was observed. The emission λmax of 1 at room temperature is at 438 nm with a higher PL quantum efficiency. Complex 1 exhibits intense blue emission with high color purity (CIE x = 0.14, y = 0.12), which has been attributed to metal-to-ligand charge-transfer triplet emission based on DFT calculations.
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