LaYO3:Sm3+ Nanocrystalline Phosphor: Preparation and Emission Properties
V. Đorđević, M.G. Nikolić, Ž. Antić, M. Mitrić and M.D. Dramićanin
Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia
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Samarium doped LaYO3 nanocrystalline phosphor powders are obtained by polymer complex solution method. Stoichiometric quantities of La2O3, Y2O3 and for dopant ions Sm2O3 were dissolved in hot nitric acid. Polyethylene glycol was added in solutions in 1:1 mass ratio to corresponding metal nitrates to form: gel. The gel is combusted and annealed at 800°C for two hours to form nanopowder samples. Crystalline structure and phase purity is checked by X-ray diffraction and show that this material is synthesized in cubic bixbyite type structure for the first time. Luminescence properties of Sm3+ doped LaYO3 exhibited characteristic orange-red emission coming from the intra-4f-shell 4G5/26HJ electron transitions with emission decay of 1.5 ms. Energy level positions are derived from emission and excitation spectra.
DOI: 10.12693/APhysPolA.120.303
PACS numbers: 71.20.Eh, 78.55.Hx, 81.20.Ka, 81.07.Bc