Photoluminescence in the CaxSr1−xWO4 system at room temperature

Spectroscopic investigations of Cd0.25Gd0.50□0.25WO4:Eu3 + — A new promising red phosphor

“…It could suggest that the structure of the investigated compounds reveals some disordering and that the energy absorbed by the WO 4 2− group in these compounds may be transferred to Eu 3+ levels nonradiatively. The localization of this band is similar with the one reported for CaWO 4 [13]. However, the explanation of the reason of so weak emission at room temperature for new solid solutions with the scheelite-like structure requires additional studies.…”

“…It is only one type of emission center that is observed for this kind of compounds. Porto et al investigated the influence of the heat treatment temperature, as well as the structural ordering on the photoluminescence intensity at room temperature for scheelite-like tungstate compounds [13]. The authors reported that in case of tungstates a complete ordering of the structure was not suitable to have good conditions of the PL emission.…”

Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation

“…In particular, phase stability has been shown to be efficiently and accurately accessible through DFT computations in much different chemistry. [63][64][65][66][67][68] Our group have been involved in a research project devoted to understand the mechanism behind the PL emissions in scheelite based materials, 41,69,70 and a fundamental issue that remains far from being fully understood concerns the role of the electronic excited states or how the electronic excited states are involved in the PL behavior. In a recent paper we have revisited theoretically the excited electronic states in SrTiO 3,71 and to the best of our knowledge, this approach has never been attempted before.…”

Influence of europium oxide doping on the structural and optical properties of pulsed laser ablated barium tungstate thin films

“…Moreover, because the attenuation constant of BaWO 4 lies in the range from microseconds to nanoseconds, it is also a potential and especially essential material for designing all-solid state lasers that can emit radiation in a specific spectral region. Photoluminescence study of different crystalline metal oxide ceramics doped mainly with rare earth ions such as Eu 3+ , Er 3+ , Nd 3+ etc., revealed a considerable potential of these materials in optoelectronic applications [5,6]. These compounds can be widely used as phosphors in cathode-ray tubes, field emission, vacuum fluorescent and electroluminescent displays as well as scintillators in X-ray and positron emission tomography [5][6][7][8][9].…”

“…Photoluminescence study of different crystalline metal oxide ceramics doped mainly with rare earth ions such as Eu 3+ , Er 3+ , Nd 3+ etc., revealed a considerable potential of these materials in optoelectronic applications [5,6]. These compounds can be widely used as phosphors in cathode-ray tubes, field emission, vacuum fluorescent and electroluminescent displays as well as scintillators in X-ray and positron emission tomography [5][6][7][8][9]. The optical properties of trivalent rare-earth ions (RE 3+ ) in tungstate materials with scheelite structure have been widely investigated [10][11][12][13], especially due to their attractive third order nonlinear dielectric susceptibilities [14,15].…”