Poly(p-phenylene vinylene)/porous GaP composite materials

We report results obtained from physical characterization of thin composite films made by mixing poly(p-phenylene vinylene) (PPV) and porous gallium p hosphide (GaP) particles with different GaP concentrations. Optical measure ments including Raman, infrared and photoluminescence show that the GaP par ticles were progressively incorporated to the polymer film which fills the powder pores. The fabricated films possess properties of both materials wit h a weak contribution of GaP to the optical properties, the main interactio n effect consists in a blue shift in the emission spectra of PPV, Diodes us ing composites as an active layer exhibit higher conductivity than that of PPV, leading to an enhancement of the light emission. The improvement in op tical and electrical performance of the composite based light emitting diod es (LEDs) makes this new composite a good candidate for display application s. (C) 2001 Elsevier Science B,V. All rights reserved.