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


  • We thank the National Science Council and Ministry of Education (project 91-E-FA 04-2-4A) of the Republic of China for financial aid.


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.