Study on the electrochemical properties of PFVYCFV, PFVDPV and PFVTPV

Abstract

The effects of molecular structure on the redox properties' are explored by the cyclic voltammetry and spectroscopy using the thin films of organic electroluminescence materials of poly(9,9'-dioctyl-2,7-fluorenediyl vinyleneco-9-cyanamide-2,7-fluorenediyl vinylene); PFVYCFV poly(9,9-dioctyl-2, 7-fluorenediyl vinylene 2,5-dicyano-1,4-phenyl vinylene); PFVDPV and poly(9,9'-dioctyl-2,7-fluorenediyl vinylene 2,3,5,6-tetracyno-1,4-phenyl vinylene); PFVTPV The PFVYCFV PFVDPV and PFVTPV show the UV/visible absorption maxima at 413 nm, 448 nm and 400 nm, respectively. Photoluminescence (PL) of these materials is blue-green color. The measured electrochemical ionization potential and electron affinity of these materials are 5.72 eV/3.19 eV for PFVYCFV 5.79 eV/3.26 eV or PFVDPV and 5.62 eV/3.48 eV for PFVTPV The electochemical bisection (oxidation & reduction) energy gaps of PFVYCFV PFVDPV and PFVTPV about PL onset are 2.93 eV 2.97 eV and 3.08 eV that are 5.09 eV & 2.97 eV 5.89 eV & 2.92 eV and 6.17 eV & 3.09 eV with respect to vacuum level, respectively.