Persistent luminescence from Y3Al2Ga3O12 doped with Ce3+ and Cr3+ after X-ray and blue light irradiation

Unraveling the Origin of Photocatalytic Deactivation in CeO2/Nb2O5 Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

“…As far as differences in recombination of charge carriers are concerned, it is worth noting that improved emission of the Ce1/Nb 2 O 5 catalyst at 545 nm may result not only from the presence of oxygen vacancies but also Ce 3+ ions where the broad emission can be expected from 400 to 650 nm, depending on the host compound. Similar emission spectra were recorded for Y 3 Al 2 Ga 3 O 12 :Ce 3+ ceramics and Sr 3 AlO 4 F:Ce 3+ phosphors, where the maximum of Ce 3+ emission occurred at around 500–550 nm due to the 5d 1 - 2 F 5/2 and 5d 1 - 2 F 7/2 transitions. − As described in the XPS section, relative contribution of Ce 3d peaks typical of ceria defect sites (e.g., Ce 3+ ions and/or Ce 4+ ions surrounded by oxygen vacancies in which electrons are trapped; peaks labeled as u 0 , u′ and v 0 , v′ in Figure ) was significantly higher for all ceria-modified Nb 2 O 5 catalysts than that observed for commercial CeO 2 . Thus, the presence of some Ce 3+ ions in niobia-based samples is very probable.…”

NaMgF3:Tb3+@NaMgF3 Nanoparticles Containing Deep Traps for Optical Information Storage

“…[7] Multidimensional optical information storage is considered as an important storage technology in the next generation, in which specific physical parameters, such as amplitude, [8][9][10][11] frequency (wavelength), [12][13][14][15] phase, [16][17][18] or polarization of light, [19][20][21] are taken as additional information dimensions to multiply the space information capacity.Persistent luminescence (PersL) materials are a kind of phosphors with light storage ability and delayed photon emissions under thermal or photostimulation. [22][23][24][25][26][27] When the trap depths of the PersL materials are deep sufficiently (typically larger than 1.2 eV), the charge carriers could be trapped (frozen) in the traps at room temperature (RT) for a long duration, thus enabling long-term optical information storage. In the past few years, a lot of work has been done on developing new materials and exploring their applications in multifunctional optical information storage.…”

“…Persistent luminescence (PersL) materials are a kind of phosphors with light storage ability and delayed photon emissions under thermal or photostimulation. [22][23][24][25][26][27] When the trap depths of the PersL materials are deep sufficiently (typically larger than 1.2 eV), the charge carriers could be trapped (frozen) in the traps at room temperature (RT) for a long duration, thus enabling long-term optical information storage. In the past few years, a lot of work has been done on developing new materials and exploring their applications in multifunctional optical information storage.…”

Size-Dependent Persistent Luminescence of YAGG:Cr3+ Nanophosphors

“…Y 3 Al 1.99 Cr 0.01 Ga 3 O 12 (YAGG:Cr 3+ ) nanophosphors were synthesized by using a modified Pechini method described previously in more detail [19]. Y 2 O 3 (99.999% purity, Stanford Materials Corporation, Lake Forest, IL, USA ), AlCl 3 (99.999% purity, Alfa Aesar, Haverhill, MA, USA) GaCl 3 (99.999% purity, Sigma-Aldrich, Saint Louise, MO, USA), and Cr(NO 3 ) 3 ×9H 2 O (99.99% purity, Alfa Aesar, Haverhill, MA, USA), additionally Citric acid (99.5% purity, Alfa Aesar, Haverhill, MA, USA) aqueous solution and ethylene glycol (99% purity, POCH.…”