Propiedades ópticas de óxidos binarios de alto gap dopados con iones luminiscentesefectos de las altas presiones

Resumo

The aim of this Thesis is the study of the optical properties of different oxide compounds doped with divalent transition metal ions (TM) such as Co (II) or trivalent rare-earth ions (RE) such as Pr (III) through different spectroscopic techniques: absorption, photoluminescence (PL), time resolved spectroscopy, Raman spectroscopy, etc. The spectroscopic techniques will be used to study the pressure-induced phase-transition from wurtzite to rock-salt phase in the case of ZnO (Raman, absorption and PL spectroscopy) and from cubic to hexagonal phase in the sesquioxides (PL spectroscopy), using for the PL experiments the optically active ions as local probes to study the pressure-induced phase-transition. We will study the effects of the size and dimensionality in the pressure induced phase-transitions in the ZnO samples as well as study the magnetic properties of the Co2+-doped ZnO through such techniques. We will also employ high pressure techniques, needed to the proper assignment of the inter-electronic transitions in the ZnO: Co2+ and crucial to explain the absence of luminescence from the 3PJ (J = 0, 1, 2) multiplet in the Pr3+-doped sesquioxides.