Estudio de nano- y microestructuras de ZnO codopado con Li y Tierras Raras
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2023
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25/11/2022
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Universidad Complutense de Madrid
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En este trabajo de tesis, titulado Estudio de nano- y microestructuras de ZnO codopado con Li y Tierras Raras, se ha analizado la influencia que puede tener la adición de determinados lantánidos en las propiedades del óxido de zinc y en su comportamiento luminiscente cuando además se añade otro codopante como es el litio. El ZnO es un material semiconductor que ya de por sí presenta unas buenas propiedades que lo hacen adecuado para infinidad de aplicaciones tecnológicas. El dopado de este material con lantánidos mejora sus propiedades luminiscentes en longitudes de onda muy concretas, aunque la diferencia de carga y de radio iónico entre el zinc y estos dopantes produce defectos locales y/o deformaciones en la red cristalina. La adición de alcalinos al ZnO, por su parte, modifica su ancho de banda, su tipo de conductividad eléctrica, algunos como el litio también mejoran la eficiencia de emisión en el óxido de zinc dopado con lantánidos, y además los alcalinos pueden ayudar a la formación de compuestos estables contribuyendo a compensar los excesos de carga que los lantánidos producen en el ZnO...
In this thesis work, entitled Study of nano- and microstructures of ZnO codoped with Liand Rare Earths, the influence that the addition of certain lanthanides may have on the properties of zinc oxide and on its luminescent behavior has been analyzed when, in addition, add another codopant such as lithium.ZnO is a semiconductor material that already has good properties that make it suitable for countless technological applications. Doping this material with lanthanides improves its luminescent properties at very specific wave lengths, although the difference in charge andionic radius between zinc and these dopants produces local defects and/or deformations in the crystal lattice. The addition of alkalis to ZnO, for its part, modifies its bandwidth, its type of electrical conductivity, some such as lithium also improve the emission efficiency in zinc oxide doped with lanthanides, and alkalis can also help the formation of stable compounds carrying out the necessary charge compensation...
In this thesis work, entitled Study of nano- and microstructures of ZnO codoped with Liand Rare Earths, the influence that the addition of certain lanthanides may have on the properties of zinc oxide and on its luminescent behavior has been analyzed when, in addition, add another codopant such as lithium.ZnO is a semiconductor material that already has good properties that make it suitable for countless technological applications. Doping this material with lanthanides improves its luminescent properties at very specific wave lengths, although the difference in charge andionic radius between zinc and these dopants produces local defects and/or deformations in the crystal lattice. The addition of alkalis to ZnO, for its part, modifies its bandwidth, its type of electrical conductivity, some such as lithium also improve the emission efficiency in zinc oxide doped with lanthanides, and alkalis can also help the formation of stable compounds carrying out the necessary charge compensation...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, leída el 25-11-2022. Tesis formato europeo (compendio de artículos)