Photoluminescence of Liquid Crystal Infiltrated Porous Silicon Film
We have investigated the photoluminescence (PL) of a porous silicon film in which a typical nematic liquid crystal 4-pentyl-4’-cyanobiphenyl infiltrated. Before the liquid crystal filtration, the PL spectrum of the porous silicon film is comprised of two luminescent bands, one of which is located at about 600 nm whereas the other of which is located at about 450 nm. After the liquid crystal filtration, the porous silicon film gives off intense deep-blue PL with its peak located at about 400 nm at the cost of the complete quenching of the PL from the original porous silicon film. Our results have demonstrated that the luminescent properties of porous silicon films can be dramatically modified by liquid crystal infiltration.
Yuan Ming Huang
Y. M. Huang et al., "Photoluminescence of Liquid Crystal Infiltrated Porous Silicon Film", Materials Science Forum, Vols. 663-665, pp. 812-815, 2011