Luminescence and structural properties of oxyorthosilicate and Al2O3 nanophosphors



A large amount of research has been conducted on semiconducting quantum dots exploring quantum confinement effects. On the other hand, nanophosphors – inorganic insulating nanostructured luminescent materials – have received considerably less attention. Our research involving nanomaterials has then focused on the question: How does reduced dimensionality affect the physical and chemical behaviour of nanophosphors? In order to partially answer this fundamental question, we have produced numerous oxides, among them Lu2SiO5:Ce (LSO), Y2SiO5:Ce (YSO), Gd2SIO5:Ce (GSO), and Al2O3, and characterized their structural and luminescent properties. Structure, grain size, phase purity and crystallite morphology were determined using X-ray diffraction, transmission electron microscopy, and electron paramagnetic resonance. The luminescent properties of the nanophosphors were characterized by thermoluminescence, radioluminescence, photoluminescence, and optically stimulated luminescence. In this work, we will present an overview of the field of nanophosphors, and summarize the results obtained in our laboratory with particular emphasis on the luminescent properties. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)