Luminescent behavior of MEH-PPV/porous silicon heterostructure

Hybrid devices formed by filling porous silicon with MEH-PPV or poly [2-methoxy-5(2-ethylhexyloxy-p- phenylenevinylene)] have been investigated in this work. Analyses of the structures by scanning electron microscopy (SEM) demonstrated that the porous silicon layer was filled by polymer with no significant change of the structures except that the polymer was infiltrated in some of the pores there by hanging the dielectric constant of the composite. The photoluminescence of the structures at 300 K showed that the emission intensity was very high as compared to that of MEH-PPV only and also blue-shift was observed. The observations were explained on the basis of the exciton transfer from porous silicon to MEH-PPV.