Unexpected long room-temperature phosphorescence lifetimes of up to 1.0 s observed in iodinated molecular systems

We report an unexpected long room-temperature phosphorescence lifetime of up to 1.0 s by doping iodinated difluoroboron( iii ) β-diketonate (IBF 2 ) into phenyl benzoate matrices. In contrast, IBF 2 powders alone show insignificant afterglow even at 77 K.