Abstract
A cationic iridium complex [Ir(dfpmpy)2(pzpy)](PF6) with 2-(1H-pyrazol-1-yl)pyridine as ancillary ligand has been prepared, and its crystal structure, photophysical and electrochemical properties have been investigated. In degassed CH3CN solution, this complex exhibits blue emission with a peak wavelength of 451nm. Photophysical property indicates that photoluminescence of complex [Ir(dfpmpy)2(pzpy)](PF6) originates mainly from ligand-centered 3π→π∗ states. In addition, solution-processed organic light-emitting diodes based on [Ir(dfpmpy)2(pzpy)](PF6) have been fabricated. A blue light electroluminescence (484nm) was observed and a maximum current efficiency of 1.56cdA−1 corresponding to a maximum power efficiency of 0.33lmW−1, has been achieved. This demonstrates that this complex is a promising phosphor for achieving efficient electrophosphorescence in the blue light region.
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