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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 12
BKCSDE 35(12)
December 20, 2014 

Heteroleptic Phosphorescent Iridium(III) Compound with Blue Emission for Potential Application to Organic Light–Emitting Diodes
Sihyun Oh, Narae Jung, Jongwon Lee, Jinho Kim, Ki-Min Park, Youngjin Kang*
Blue phosphorescence, Ancillary ligand, X-ray structure, Organic Light-Emitting Diodes (OLEDs)
Blue phosphorescent (dfpypy)2Ir(mppy), where dfpypy = 2',6'-difluoro-2,3'-bipyridine and mppy = 5-methyl- 2-phenylpyridine, has been synthesized by newly developed effective method and its solid state structure and photoluminescent properties are investigated. The glass-transition and decomposition temperature of the compound appear at 160 oC and 360 oC, respectively. In a crystal packing structure, there are two kinds of intermolecular interactions such as hydrogen bonding (C-HF) and edge-to-face C-Hπ(py) interaction. This compound emits bright blue phosphorescence with λmax = 472 nm and quantum efficiencies of 0.23 and 0.32 in fluid and the solid state. The emission band of the compound is red-shifted by 40 nm relative to homoleptic congener, Ir(dfpypy)3. The ancillary ligand in (dfpypy)2Ir(mppy) has been found to significantly destabilize HOMO energy, compared to Ir(dfpypy)3, (dfpypy)2Ir(acac) and (dfpypy)2Ir(dpm), without significantly changing LUMO energy.
3590 - 3594
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