Abstract
AbstractIn this work we propose the study of the spectroscopy properties and the energy level location of Ce3+ and Pr3+ in Gd2O2S, along with the effects of Ce4+ (Ce2O2S2) incorporation in Gd2O2S and Gd2O2S:Pr3+ in order to understand the formation and position of the associated defects energy levels in relation to the band structure of Gd2O2S and Pr3+ energy levels. Ce‐, Pr3+‐doped and Pr3+,Ce‐doped Gd2O2S were prepared by the sulfidization of a basic gadolinium carbonate with S8 using H2/N2 (3.0/97.0%) and air during the firing of the precursor. Samples were analyzed by X‐ray diffraction in order to guarantee the formation of the Gd2O2S single phase. Diffuse reflectance spectroscopy and luminescent measurements (emission/excitation) were used to locate Ce3+, Pr3+ and defects energy levels in relation to the band structure of Gd2O2S. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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