Bimetallic Cyclometalated Iridium(III) Diastereomers with Non‐Innocent Bridging Ligands for High‐Efficiency Phosphorescent OLEDs |
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| Authors: | Dr Yonghao Zheng Dr Andrei S Batsanov Dr Mark A Fox Dr Hameed A Al‐Attar Khalid Abdullah Dr Vygintas Jankus Prof Martin R Bryce Prof Andrew P Monkman |
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| Institution: | 1. Department of Chemistry, Durham University, Durham DH1 3LE (UK);2. Department of Physics, Durham University, Durham DH1 3LE (UK) |
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| Abstract: | Two phosphorescent dinuclear iridium(III) diastereomers (ΛΔ/ΔΛ) and (ΛΛ/ΔΔ) are readily separated by making use of their different solubilities in hot hexane. The bridging diarylhydrazide ligand plays an important role in the electrochemistry and photophysics of the complexes. Organic light‐emitting devices (OLEDs) that use these complexes as the green‐emissive dopants in solution‐processable single‐active‐layer architectures feature electroluminescence efficiencies that are remarkably high for dinuclear metal complexes, achieving maximum values of 37 cd A?1, 14 lm W?1, and 11 % external quantum efficiency. |
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| Keywords: | diastereomers iridium ligand design luminescence OLEDs |
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