European Journal of Inorganic Chemistry · 2011 · 13 citations · 26 references
Natural SciencesMaterials EngineeringMaterials ScienceNanomaterialsNanotechnologyOptical MaterialsInorganic NanoparticlesLuminescent MaterialsMetal Oxide NanomaterialsNanomaterial CharacterizationNanomaterials SynthesisNanoparticle SynthesisCrystalline StructureHydrothermal ProcessingLuminescent NanomaterialsMetal Oxide Nanoparticle SynthesisMetal Oxide Nanoparticles SynthesisNanophosphorsNanorodsPhotoluminescent Materials
Abstract CeO 2 :Sm 3+ nanophosphors were synthesized by hydrothermal treatments of aqueous solutions containing cerium nitrate, samarium nitrate, and sodium hydroxide. The shape of the nanocrystals was controlled simply by changing the hydrothermal treatment temperature. Nanorods of CeO 2 :Sm 3+ were obtained at 100 °C, whereas highly crystalline nanocubes were formed at a higher temperature of 180 °C. Photoluminescent properties of the nanophosphors were greatly influenced by their shapes. The as‐prepared nanocubes exhibited much stronger orange‐red emissions from Sm 3+ than the as‐prepared nanorods. A high‐temperature treatment of the nanorods at 700 °C did not significantly enhance the emission intensity. The different photoluminescent properties were then examined by FTIR and Raman spectroscopy. Results showed that oxygen defects were the major reason for the inferior properties of the nanorods even after the high‐temperature treatment. In contrast, the CeO 2 :Sm 3+ nanocubes were shown to be excellent nanophosphors prepared at 180 °C without any further treatment.
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Raman scattering and lattice defects in nanocrystalline CeO2 thin films
Igor Kosacki, Toshio Suzuki, Harlan U. Anderson et al. · Solid State Ionics · 2002 · 561 citations