Luminescence properties of sol–gel-derived TiO2:Sm powder

Structural and luminescence characteristics of SnO2:Eu and SnO2:Eu,Sb nanophosphors upon annealing at high temperatures

“…the symmetry of the emission center). No marked temporal stretching of the emission due to hindered energy transfer from host to guest is evident in the case of this host, in contrast to TiO 2 [3]. Moreover, the decay time of the long decay component does not appreciably depend on annealing treatment suggesting that the quenching of Eu 3+ emission does not take place evenly across the bulk of the crystal but is confined to a particular fraction of emission centers (e.g.…”

“…Moreover, the matrices can be perspective for rare earth (RE) activation owing to the possibility of host-mediated excitation of RE impurities while providing transparency throughout the visible range and reduced thermal quenching of RE emission [3,4]. The host-toguest energy transfer imposes the potential of carrier-mediated excitation of RE ions as well as the possibility of employing very thin phosphor layers due to the strong absorption of the excitation light by the host.…”

Spectroscopic and crystal-field analysis of energy levels of Eu3+ in SnO2 in comparison with ZrO2 and TiO2

“…Wide-gap (E g > 3 eV) semiconductors like SnO 2 (stannia), TiO 2 (titania) or ZrO 2 (zirconia) are technologically interesting since, due to an efficient energy transfer from host to rare-earth (RE) activators, these materials could be employed in the form of very thin phosphor layers and impose the potential of carrier-mediated excitation of RE ions yet providing transparency throughout the visible range and reduced thermal quenching of RE emission [1][2][3]. Moreover, such doped oxides are relatively easily prepared in various morphologies employing "soft" wet chemistry techniques.…”

Multisite luminescence of rare earth doped TiO2 anatase nanoparticles

“…10b) exhibits the most pronounced band centered at w360 nm, associated with the band-to-band excitation of TiO 2 and the following energy transfer to Sm 3þ ions, indicating that the sensitized excitation is more efficient than the direct one [8,31]. Other two, less pronounced excitation bands, centered at 411 and 476 nm, could be attributed to the direct excitation of Sm 3þ ions to the 6 G 7/2 and 4 I 13/2 levels, respectively [8,35]. , for sites I, II and III, respectively.…”