AVS 45th International Symposium
    Organic Electronic Materials Topical Conference Monday Sessions
       Session OE-MoP

Paper OE-MoP5
Structure and Properties of the System of Nanometer-scale Quantum Wells Fabricated by the Incorporation of Organic Molecules in Sol-gel SiO@sub 2@ Glass

Monday, November 2, 1998, 5:30 pm, Room Hall A

Session: Organic Electronic Materials Poster Session
Presenter: Y.V. Vorobiev, CINVESTAV-IPN, Mexico
Authors: J. Perez-Bueno, Univ. Autonoma de Queretaro, Mexico
L.L. Diaz-Flores, Inst. Tecnologico de Saltillo, Mexico
F.J. Espinoza-Beltran, CINVESTAV-IPN, Mexico
R. Ramirez-Bon, Universidad de Sonora, Mexico
Y.V. Vorobiev, CINVESTAV-IPN, Mexico
J. Gonzalez-Hernandez, CINVESTAV-IPN, Mexico
Correspondent: Click to Email
Organic molecules of the colorants (like Fast Green, Brilliant Black, Tartrazine, etc.)were encapsulated in SiO@sub 2@ glass derived by the solution-gelatinization process. The doping organic material in a power form was added to the initial solution, and after its solidification and annealing the colored glass was obtained containing the molecules of the colorants within the vitreous matrix. The optical and photoacoustic absorption as well as the photoluminescence excitation and emission spectra reveal the existence of sets of the discrete energy levels in these systems. The levels separation were determined by the structure of the colorant's molecule and the percentage of doping. The quantum mechanical description of the system is given considering the organic molecules as the two-dimensional or circular potential wells, depending on the molecular structure. The finite depth of the wells is taken into account by introduction of the periodic boundary conditions, which essentially influences the calculated energy spectra. The dependence of the spectra upon the colorant concentration is explained on the basis of the perturbation theory and, in itself, confirms the importance of the account of the finite depth of the potential wells. The theory was a reasonable agreement with the experiment. The results obtained demonstrate that the sol-gel technology gives a simple and cheap method of fabrication of a system of the nanometer-scale potential wells with a set of the energy levels which could be regulated by the structure of the doping molecules and their concentration.