Rigidochromic Phosphorescence of [Ir(2-phenylpyridine)2(2,2′-bipyridine)]+ in C16TMA+: Layered Silicate and Its Förster Resonance Energy Transfer



Layered silicate–[Ir(2-phenylpyridine)2(2,2′-bipyridine)]+ {[Ir(ppy)2(bpy)]+} composites were synthesized by the ion exchange between the intercalated alkyltrimethylammonium ions and [Ir(ppy)2(bpy)]+ ions. The loading amounts of the Ir complexes were increased by an increase in the reaction temperature. The photophysical properties of the samples were characterized by the luminescence spectra and luminescence lifetimes. The photophysical properties of Ir complexes were affected by the loading amount in the interlayer space, which resulted in higher-energy phosphorescence emission. The higher-energy state in the low-loading samples was applied to Förster resonance energy transfer to the exterior acceptor molecules.