AVS 47th International Symposium
    Photonics Tuesday Sessions
       Session PH-TuP

Paper PH-TuP1
Optical Processes in PMMA, SiO@sub 2@ and Hybrid Organic-Inorganic Sol-Gel Films Colored with Rhodamines

Tuesday, October 3, 2000, 5:30 pm, Room Exhibit Hall C & D

Session: Poster Session
Presenter: J.J. Pérez-Bueno, Universidad Autónoma de Querétaro, México
Authors: J.J. Pérez-Bueno, Universidad Autónoma de Querétaro, México
S.R. Vazquez-García, Universidad Autónoma de Querétaro, México
L. García-González, Unidad Querétaro, México
Yu.V. Vorobiev, Unidad Querétaro, México
J. González-Hernández, Unidad Querétaro, México
Correspondent: Click to Email
Various types of rhodamines (B-500, 6GDN), at different concentration, have been introduced in thin layers formed by a single matrix (SiO@sub 2@ or PMMA) and by a hybrid matrix, that is, a mixture of SiO@sub 2@ and an acrylic polymer, at variuos proportions. Firts, the precursor acrylic polymer was synthesized using the following components: 2-hydroxyethyl methacrylate (37.3 %), butyl acrylate (36.3 %), styreno (20.0 %), methyl methacrylate (4.4 %) and isobutyl methacrylate (2.0 %). Before solidification, the precursor avrylic polymer was dissolved in a mixture of 2-propanol and 2-butoxyethanol and then the tetraethyl-orthosilicate (TEOS) added to that solution. The hydrolisation and polycondensation were catalyzed using HCl. The optical absorption and the photoluminescence of layers on glass substrates were measured. It is found that the spectral position and fine structure of rhodamine absorption band greatly depend on the type of matrix. The luminescence intensity in layers with the PMMA and hybrid matrix is more intense than that of the layers with the SiO@sub 2@ matrix. The effects produced by the aggregation of the rhodamin molecules and their local environment on the optical processes addressed above are discussed.