MOLECULAR-DISTRIBUTION OF PHOTOLUMINESCENT RU(BPY)(3)(2+) DISPERSED IN A POLYMER FILM AND ITS DISTANCE-DEPENDENT CONCENTRATION QUENCHING

Photoluminescent tris(2,2'-bipyridine)ruthenium(II) (Ru(bpy)3(2+)) was dispersed in a polysiloxane film by mixture casting from an ethanol solution. The distance distribution of the dispersed molecules and the distance-dependent concentration quenching of the photoluminescence were studied. The quenching obeyed a static quenching model, and the quenching distance was obtained by changing the concentration of the complex. A more correct quenching radius of 1.1 nm was obtained by considering the excluded volume of the probe. The distance between the dispersed molecules was discussed in terms of charge hopping between the molecules.