Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

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JUNE 28 WEDNESDAY AFTERNOON JS1-WeA-P.5 PHOTOLUMINESCENCE OF RHODAMINE 6G DOPED AMOR- PHOUS TIO 2 THIN FILMS GROWN BY SOL-GEL. R. Palomino-Merino 1 , J. Torres- Kauffman 1 , R. Lozada-Morales 1 , and O. Portillo-Moreno 2 , Benemérita Universidad. Autónoma de Puebla. 1 Posgrado en Optoelectrónica, Facultad de Ciencias Físico-Matemáticas. 2 Facultad de Ciencias Químicas. México. M. García-Rocha, and O. Zelaya-Angel. Department of Physics. Centro de Investigacion y de Estudios Avanzados del IPN. P.O. Box 14-740, Mexico 07360 D.F. Rhodamine 6G doped amorphous titania thin films were prepared by the sol-gel technique. The films were grown at room temperature and supported on silica-glass substrates which were previously chemically activated. Photoluminescence (PL) spectra were registered at room temperature by using as photoexcitation the 325 nm He-Cd line. The PL versus the photon energy emission curves peak at around 3.2 eV, which open the possible application of this material for solid state UV laser devices fabrication. 128
JUNE 28 WEDNESDAY AFTERNOON JS1-WeA-P.4 PHOTOLUMINESCENCE AND BAND-SPLITTING IN CDS THIN FILMS, INFLUENCE OF CDCL 2 AND THERMAL ANNEALING. O. Vigil-Galán, G. Contreras-Puente, and J. Aguilar-Hernández. Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, México 07738 D.F. J. Vidal-Larramendi, and A. Arias-Carbajal. Univ. de la Habana, 43100, La Habana, Cuba. O. Zelaya-Angel. Departamento de Física, CINVESTAV-IPN, P.O. Box 14-740, México 07360 D. F. CdS thin films were deposited on conducting glass substrates by three different techniques: (a) chemical bath deposition (CBD), (b) close spaced vapor transport (CSVT), and (c) laser ablation (LA). As-grown and coated with CdCl 2 CdS-samples were thermal treated (TT) in Ar. From optical absorption measurements the valence band splitting in cubic and hexagonal layers are observed (in CBD and CSVT films). In the case of CdS films grown by CSVT the hexagonal wurtzite (W) crystalline phase is observed in as-grown and TT samples, while using CBD as-grown and annealed CdS films are cubic zincblende (ZB). For LA-CdS samples no band splitting was observed in both asgrown and annealed samples, these two types of LA-CdS layers have W as crystalline phase. Band splitting is characterized for the variation of the energy band gap (E g ) shift (ΔE g ) due to the spin-orbit * * interaction with ΔE g = 0.069 eV, where ΔE g → Δ E g when ZB → W, with Δ E g = 0.081 eV, the change is owing to the reordering of splitting levels because of the addition of the crystal field interaction. The evolution of the crystalline quality and the ΔE g change in the three kinds of grown films, beside optical absorption measurements, was studied from photoluminescence spectra 127
Page 1 and 2: Wüest M. 51 Wykes M. 82 Yamaguchi
Page 3 and 4: Oliveira F. J. 140 Orts M.J. 76 Ota
Page 5 and 6: Gabouze N. 125 Galán L. 112, 113,
Page 7 and 8: AUTHOR’S INDEX Aouabdia Y. 46 Aba
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Sigilum Universitatis Studii Salama
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