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http://cio.repositorioinstitucional.mx/jspui/handle/1002/553| ON THE STUDY OF PHOTOLUMINESCENCE AND PHOTOCATALYTIC PROPERTIES OF DOPED BaZrO3 | |
| RAUL BORJA-URBY | |
| Luis Armando Diaz-Torres | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| BARIUM ZIRCONATE, XRD, ABSORPTION, BAND GAP, MICROSCOPY, PHOTOLUMINESCENCE | |
| "The current human lifestyle relays on the constant development of technology and scientific knowledge on a faster rate than it was on past decades, to support and solve future necessities of human societies. It exist therefore, a necessity to generate specialized human resources to work on and to develop the technological industries which will aid on the solution of current and future problems. It is through the thorough study of the properties of the materials used on industry, that more efficient used or new applications could be found for them. Such is the case of illumination and catalysis industries. Generation of efficient white-light sources and new photocatalyst materials active in the visible-light range, are now two hot trends on the materials science field. In particular, barium zirconate (BaZrO3) is a ceramic material of the perovskite family which had been intensively studied in the past, now it is found in a wide variety of useful applications. The present work focused on the study and characterization of BaZrO3 crystalline structure, composition, morphology, optical, luminescent and catalytic properties as a function of: 1) the ionic radii of the substituted rare earth elements (RE), 2) overall RE concentration and 3) total bismuth concentration. The first two were concerned on the generation of white-light and blue-light nanophosphors, respectively. In the case of white-light nanophosphor, RE single doping BaZrO3 approach was used. Photoluminescence (PL) of each material sample was obtained after UV excitation at 267 nm site. During the hydrothermal synthesis silicon atoms were inadvertently added to the compounds from the glass autoclave. Incorporation of slight concentrations of silicon atoms into the RE single doped BaZrO3 samples seems favorable to the PL properties. Dysprosium and europium doped samples had better energy distribution on the emission spectra. White and red color emissions were respectively obtained from each of these samples due to nonradiative energy transfer process from the host to the dopant. Emission spectra of dysprosium doped sample approach to a white emission according to the CIE 1931 color model. In the case of blue-light emission phosphors, it was obtained by upconversion (UC) process under NIR excitation. The color emission of ytterbiumthulium codoped BaZrO3 samples strongly depended on cross relaxation processes between thulium ions." | |
| 2012-05 | |
| Tesis de doctorado | |
| Inglés | |
| León, Guanajuato | |
| Público en general | |
| Borja Urby, (2012). "On the study of photoluminescence and photocatalytic properties of doped BaZrO3". Tesis de Doctorado en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato. 62 pp. | |
| ÓPTICA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | DOCTORADO EN CIENCIAS (ÓPTICA) |
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