Full-range tunability of electron and hole carrier mobilities and density ratios via incorporation of highly electron-deficient moieties in poly(phenylene vinylene) side chains

The incorporation of a triazole moiety in poly(phenylene vinylene) (see Figure) allows tuning of the ratio of electron flux to hole flux over a broad range. Originally hole-dominated transport can be turned to electron-dominated transport. At proper triazole content, electron and hole fluxes are balanced, and the efficiency and brightness of a device with a high work function Al cathode can be improved to the level of low work function Ca.