Influence of the adsorbed Ru(II) complexes on the properties of photoluminescence from the chemically oxidized porous silicon

The sensitizers cis-Ru(bpy)(2)(CN)(2) and trans-Ru(py)(4)(CN)(2) had been a pplied to influence the photoluminescence (PL) of the chemically oxidized p orous silicon (PS) by attaching them on the surface of the nanoparticles in the PS layers. The PL properties including the peak energy,the decay time and the intensity were affected by the adsorption of cis-Ru(bpy)(2)(CN)(2), but not by that of trans-Ru(py)(4)(CN)(2). By comparing the chemical and p hoto-physical properties of cis-Ru (bpy)(2)(CN)(2) with those of trans-Ru(p y)(4)(CN)(2) we deduced that it was the energy transfer between the oxidize d PS and the adsorbed cis-Ru(bpy)(2)(CN)(2) that induced the change of the PL properties. Although the pi, efficiency was decreased, the peak energy c ould be changed in some degree and the decay time of the PL was shortened, The results clew a possibility for the change of the PL properties of the o xidized PS by an energy transfer process. It also helps to understand the m echanism of the PL.