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the complex [Ir(ppy)2(bpy)][PF6] shows a broad emission band at 585nmwith a PLQY of 0.14 and excited-state lifetime of 0.43 ¦Ìs. A similar emission profile is observed in the EL emission(Figure 15.4a), which indicates that the emitting excited state is the same for both processes. Although this phenomenon is very common, the EL emission of Ir-iTMCs with phen as ancillary ligand is strongly redshifted compared to the emission in solution (Figure 15.4b). Photophysical and theoretical studies indicate that the phen ligand provides a complicated manifold of lowest triplet excited states close in energy. Hence, it is feasible that the relative order of the emitting triplet states changes on modifying the environment.
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