Photoluminescence of porous silicon with liquid crystalline fillers

Luminescence spectra of both pure porous silicon and filled with liquid crystals 5CB and H109 which emit radiation in violet spectral region are investigated. It is shown that there are bands of both porous silicon and a liquid crystal in the luminescence spectrum of porous silicon with liquid crystall filler. Thus the intensity of the band corresponding to porous silicon increases several times in comparison with a luminescence of pure porous silicon without filler. Experimental results are explained by internal no radiating swapping of energy from a liquid crystal to porous silicon