Poly(p phenylene vinylene)/porous silicon light emitting diodes

Optical properties of composite films formed by mixing poly (p phenylene vi nylene) and porous silicon (PPV/PS) with various concentrations were invest igated by Raman, infrared (IR) and photoluminescence (PL) spectroscopy. Ana lysis of the Raman and IR spectra showed that PS was incorporated to the po lymer matrix without effecting its properties. Modifications of the PL spec tra were explained by the presence of oxygen from the PS grains. Light emit ting diodes (LEDs) using the composite as an emitter exhibited low turn-on voltage as compared to PPV based devices. (C) 2000 Elsevier Science S.A. Al l rights reserved.