Effect of Sr2+-doping on structure and luminescence properties of BaAl2Si2O8:Eu2+ phosphors

Improved photoluminescence properties of BaAl 2 Si 2 O 8 :Eu 3+ ,Tb 3+ phosphors by doping Tb 3+

“…Additional excitation peaks at 310 -500 nm, caused by the f -f transitions of Tb 3+ , are observed [26]. 7 The excitation spectra of Ba 0.88-x Al 2 Si 2 O 8 :0.12Eu 3+ ,xTb 3+ (0≤x≤0.12) phosphors monitored at 612 nm are shown in Fig. 4(a).…”

“…There are three different cation sites in the BaAl 2 Si 2 O 8 host, i.e., a twelve-coordinated Ba 2+ and two seven-coordinated Al 3+ and Si 4+ [7,13]. The ionic radius of Eu 3+ (1.066 Å) and Tb 3+ (1.04 Å) is closer to that of Ba 2+ (1.42 Å) in comparison with that of Al 3+ (0.39 Å) and Si 4+ (0.26 Å) [7,[14][15][16]. It is thus expected that Eu 3+ and Tb 3+ ions occupy Ba 2+ sites in the host lattice.…”

“…Feldspars are natural aluminosilicates, constituting one of the largest groups of minerals found in the Earth's crust [7]. In alkaline-earth feldspars MAl 2 Si 2 O 8 (M=Ca, Sr, and Ba), its structures are constructed by an array of interlinked corner-sharing SiO 4 It is known that Eu 3+ ions are good luminescent centers for many red phosphors due to their excellent red-emission [11,12].…”

Effect of CeO2 Doping on Phase Structure and Microstructure of AlCoCuFeMnNi Alloy Coating

“…Besides, the contents of all elements except for Ce are equal. Therefore, the lattice expansion causes the diffraction peaks to shift toward a small angular direction 18,19 .…”

Enhanced photoluminescence properties of red emitting Ba1−xAl2Si2O8:xEu3+ phosphors by charge compensation

“…The Ba 2+ is occupied between the sheets with 12 equidistant oxygen neighbours to compensate for the charge difference between Al 3+ and Si 4+ . 13 The Eu 3+ ions may occupy the Ba 2+ site in the host lattice because the ionic radius of Eu 3+ (1.066 Å) is similar to that of Ba 2+ (1.42 Å) in comparison with other Si 4+ and Al 3+ ions. The ionic radii of Al 3+ and Si 4+ are 0.39 and 0.26 Å, respectively.…”