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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.

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 750oC, 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 950oC 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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