Abstract [(Aryl‐ppy)Pt(acac)] (ppy = 2‐phenylpyridine, acac = acetylacetonato) derivatives with triphenylamine (TPA) substituents on the ppy ligand have been prepared. The TPA fragment is either directly cyclometallated ( Pt‐1 ) or attached to the ppy ligand through a C–C single bond ( Pt‐2 ) or a novel α‐diketo group ( Pt‐3 ). All the complexes show room‐temperature phosphorescence in fluid solution with emission bands in the range of 530–590 nm, which are red‐shifted relative to the model complex [ppyPt(acac)] ( λ em = 486 nm). This emission colour tuning effect is attributed to either an elevated HOMO energy caused by electron‐donating TPA substituents on the ppy ligand or a decreased LUMO energy caused by the electron‐trap effect of electron‐withdrawing substituents; both result in a smaller HOMO–LUMO energy gap and thus red‐shifted emission. The complexes show extended luminescence lifetimes ( τ = 3.0–5.5 μs) relative to the parent complex [ppyPt(acac)] ( τ = 2.6 μs). The luminescent oxygen‐sensing properties of the complexes were studied in solution and polymer films. White light emission was observed with an OLED device fabricated with complex Pt‐3 with CIE coordinates of (0.32, 0.32).
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Wu et al. (2010) studied this question.
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