Anti-Stokes delayed fluorescence from metal-organic bichromophores

Long wavelength excitation of [Ru(dmb)(2)(bpy-An)](2+) (dmb is 4,4'-dimethyl-2,2'-bipyridine and bpy-An is 4-methyl-4'-(9-anthrylethyl)-2,2'-bipyridine) in CH3CN solution produces upconverted delayed singlet anthracene fluorescence via bimolecular triplet-triplet annihilation.