Photoluminescence quenching and confinement effects in mesoporous silicon: photoluminescence, optical and electrical studies
Abstract
Chemical modifications including Ag nanoparticle deposition have been performed on electrochemically formed mesoporous silicon (PS) to optimize confinement and templating of molecular systems within PS as well as to modify the electronic properties of both the host and the guest. A complete quenching of photoluminescence (PL) of PS along with a considerable change of the optical properties of the dye rhodamine 6G (R6G) in PS has been achieved. For all states of preparation of the sample, PL, UV/vis transmission spectroscopy and electrical measurements were carried out. From our transmission and electrical measurements we concluded that the quenching of PL is attributed to a fundamental disruption of the luminescence mechanism. A blue shift in the PL peak of R6G in PS compared to bulk R6G is attributed to an efficient quantum confinement effect.