Toward highly photoluminescent and bipolar charge-transporting conjugated polymers

DBPP (2,5-di-(2-biphenyl)-1,4-phenylene) units were embedded into a PPV (po ly(p-phenylenevinylene)) backbone, resulting in a dramatic improvement in t he solid-state photoluminescence quantum efficiency of the polymer. Oxadiaz ole units were introduced as PPV main-chain substitutents, imparting the re sulting polymer with bipolar charge-transporting properties. A carefully-de signed conjugated polymer combining both DBPP and oxadiazole units showed b oth high PL efficiency and bipolar charge transport ability, making it a pr omising candidate for the fabrication of efficient single-layer LED devices .