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Influence of titanium and lutetium on the persistent luminescence of ZrO_2

2012; Optica Publishing Group; Volume: 2; Issue: 3 Linguagem: Inglês

10.1364/ome.2.000331

2159-3930

José Miranda de Carvalho, Lucas Carvalho Veloso Rodrigues, Jorma Hölsä, Mika Lastusaari, L. A. O. Nunes, M.C.F.C. Felinto, Oscar L. Malta, Hermi F. Brito,

Luminescence and Fluorescent Materials

Non-doped as well as titanium and lutetium doped zirconia (ZrO 2 ) materials were synthesized via the sol-gel method and structurally characterized with X-ray powder diffraction.The addition of Ti in the zirconia lattice does not change the crystalline structure whilst the Lu doping introduces a small fraction of the tetragonal phase.The UV excitation results in a bright white-blue luminescence at ca. 500 nm for all the materials which emission could be assigned to the Ti 3+ e g  t 2g transition.The persistent luminescence originates from the same Ti 3+ center.The thermoluminescence data shows a well-defined though rather similar defect structures for all the zirconia materials.The kinetics of persistent luminescence was probed with the isothermal decay curve analyses which indicated significant retrapping.The short duration of persistent luminescence was attributed to the quasi-continuum distribution of the traps and to the possibility of shallow traps even below the room temperature.