PHOTOLUMINESCENCE OF OLIGOMER AND POLYMER BLENDS

We have measured the photoluminescence(PL) of polymer and oligomer ble nds using partially converted poly-(p-phenylene vinylene) (PC-PPV) and a kind of p-phenylene vinylene oligomer, 1,4-distyrylbenzene in the s olution of N-methyl-2-pyrrolidinone (NMP). The PL spectra of this blen ded material showed that the amounts of oscillator strength of oligome r peak at 2.79eV shifted to red, near 2.49eV, which is responsible for PC-PPV. This changing of oscillator strength results the enhancement of initially weak PL intensity of PC-PPV and eventually changing the c olor. In order to explain the excitonic migration effect occurring mor e seriously in blended system, as we believed, we compared this data t o that of PC-PPV/oligomer multi-layered film as well as of oligomer it self. Those results will be also compared with that of another blended material, oligomer and polyaniline(PANI), and the differences will be discussed.