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Luminescent materials based on thin metal oxide films doped with rare earthions

Kanarjov P.¹, Reedo V.¹, Oja Acik I.², Matisen L.¹, Vorobjov A.¹, Kiisk V.¹, Krunks M.², Sildos I.¹

¹Institute of Physics, University of Tartu, Tartu, Estonia

²Tallinn University of Technology, Department of Materials Science, Tallinn, Estonia

Выставление онлайн: 20 августа 2008 г.

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Thin luminescent films of TiO₂ : Sm were prepared by sol-gel-method using spray pyrolysis technique. Various techniques (includind IR absorption, Raman, AFM, XPS, photoluminescence) were to characterize the samples. After a thermal treatment up to 750^oC, an intense Sm³⁺ luminescence with a well-resolved fine structure was observed under optical excitation within the fundamental absorption band of the TiO₂ host. After further thermal treatments up to 950^oC the luminescence was quenched yet still no anatase-to-rutile phase transformation was observed. The behavior is attributed to nanocrystallinity and segregation of Sm ions onto surface. Estonian Science Foundation is acknowledged for financial support (grants N 6999, 6660, 6954 and 7102). PACS: 78.30.-j, 64.70.Kb

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