Electrical and optical properties of phenylene vinylene oligomers obtained by vacuum evaporation

Optical absorption, photoluminescence and electrical impedance of phenylene vinylene (PV) oligomer films deposited onto indium—tin oxide (ITO) substrates by evaporation in vacuum were studied in a wide range of temperatures (10–450 K) and a.c. frequencies (0.3–105 Hz). The material possesses an optical band of 2.8 eV. Photoluminescence spectra are Stokes shifted for 0.2 eV with respect to absorption and excitement luminescence. A.c. electrical properties of the material show some temperature-dependent hysteresis of the real part of dielectric permittivity, as well as several relaxation/conduction modes at low (− 100 to − 50 °C) and high (above 60 °C) temperatures.