Synthesis and characterization of a novel poly(p-phenylenevinylene) derivative containing dibenzothiophene-5,5-dioxide moiety in the main chain with high electron affinity

摘要

We synthesized poly(2,8-dibenzothiophene-5,5-dioxide-vinylene-alt-l,4-phenylene-vinylene) (DD-PPV) (oligomer) by the traditional Wittig condensation and characterized it with IR, NMR, UV―vis etc. It is thermally stable and soluble in high polar solvents. Its UV―vis absorption and photoluminescence spectra in N,N-dimethyl-formamide solution show peaks at 369 and 457 nm, respectively. Its fluorescence quantum efficiency in solution is 75%. Its electron affinity is 3.17 eV. The band gap is 2.88 eV. Single-layer light-emitting diode device indium―tin oxide glass/DD-PPV/Aluminum emits greenish blue and the turn-on voltage is approximately 12 V.