Phosphorescent polymer light-emitting diodes based on an end-capped polyfluorene with Rhenium (I) chromophores

A novel electrophosphorescent polymer was prepared by a pyridine end-capped polyfluorene reacted with 2,2-bipyridyl(tricarbonyl)rhenium(I) chloride. Using this approach, we can simultaneously control the molecular weight of the polymer, and incorporate phosphorescent metal complexes to the polymer without the phase separation problem between the metal and polymer. The incorporation of the metal complexes into the polymer has been demonstrated by utilizing 1H-NMR, Ultraviolet-visible (UV–vis) spectroscopy, PL spectra and EL spectra.