Organic-inorganic system of two-dimensional quantum wells prepared by the dye incorporation into sol-gel glass

Molecules of the organic colorants were encapsulated in SiO2 glass derived by the solution-gelatinization process; as the result, the colored glass wa s obtained containing the colorant embedded within the glass in a molecular or molecular aggregates form. The system thus prepared manifests an effici ent photoluminescence; the optical absorption as well as the photoluminesce nce excitation and emission spectra reveal the existence of sets of the dis crete energy levels. The structure of the colorant's molecule and the perce ntage of doping determine the level separation; the dependence upon the env ironment is relatively small. The quantum mechanical description of the sys tem is given considering the organic molecules as the two-dimensional quant um wells, with the boundary conditions taking account of the finite depth o f the wells and the existence of aggregation. The results of calculations a gree with the experiment. (C) 2000 Elsevier Science BN. All rights reserved .