Luminescent Characteristics of Ba_1−xAl₂Si₂O₈:xTb³⁺ Green Phosphors

Abstract

Ba(1--x)Al2Si2O8:xTb3+ (0.03 < or = x < or = 0.12) green phosphors are prepared by solution combustion method. The photoluminescence properties of the Ba(1--x)Al2Si2O8:xTb3+ phosphors are studied as a function of Tb3+ concentration. The Ba(1--x)Al2Si2O8:xTb3+ phosphors crystallize in a hexagonal crystal structure. The excitation spectra consist of two broad bands with maxima at 238 nm and 265 nm and several weak peaks in the range of 310-500 nm. Strong emission peaks are observed at 484, 540, 589, and 612 nm due to the (5)D4 --> (7)F6, (5)D4 --> (7)F5, (5)D4 --> (7)F4, and (5)D4 --> (7)F3 tran- sitions of the Tb3+, respectively. The emission peak (540 nm) from the (5)D4 --> (7)F3 transition is dominant, indicating green light emission. Ba(1--x)Al2Si2O8:xTb3+ phosphor shows the strongest green emission intensity. The Ba(1--x)Al2Si2O8:xTb3+ can be considered a promising green phosphor for white LEDs applications.

Effect of kaolinite edge surfaces on formation of Tb3+-doped phosphor by solid-state reaction

“…2) is typical for Tb 3+ ions, with green emission due to the 5 D 4 / 7 F 5 transition at 543 nm. 14 This emission is absent in the spectra of the m-CAS and m-CAS-Tb-0.075 (data not shown). The product colourations observed under normal lighting were in agreement with the visible-light spectra shown in Fig.…”

“…3g), which produced a pattern similar to those previously published in the literature. 14 The m-CAS-Tb-0.3-4.5 h primarily produced a halo pattern (Fig. 3c).…”

“…8 This sample was processed using similar grinding conditions to those employed in generating the m-CAS and was calcined at 1100 C for 12 h. 8 Notably, layered BaAl 2 Si 2 O 8 has previously been used to synthesize a Tb 3+ -doped phosphorescent material. 14 Solid-state reactions including Ca 2+ or a reducing atmosphere…”

Four-Dimensional Incommensurate Modulation and Luminescent Properties of Host Material Na3La(PO4)2

“…Excited at the wavelength of 375 nm, Na 3 La­(PO 4 ) 2 :Tb 3+ shows strong green emission spectrum, as shown in Figure b. Four typical transitions from 5 D 4 level down to 7 F J levels of 4f 8 configuration of Tb 3+ were observed, that is, 5 D 4 → 7 F 6 (around 488 nm), 5 D 4 → 7 F 5 (around 546 nm), and 5 D 4 → 7 F 3 (around 621 nm), and the strongest of them is the green emission at ∼546 nm. − The excitation and emission spectra indicate that phosphor Na 3 La­(PO 4 ) 2 :Tb 3+ exhibits a strong greenish emission.…”

Synthesis and luminescence characterization of Y2BaZnO5:RE (RE = Eu3+, Tb3+, Pr3+ and Sm3+) phosphors

“…Line emission corresponding to f–f transitions is observed. Commonly observed, most intense lines are around 485 and 543 nm, corresponding to (Δ J = 2) the forced electric dipole allowed 5 D 4 → 7 F 6 and (Δ J = 1) magnetic dipole allowed 5 D 4 → 7 F 5 transitions, respectively . At low concentrations, blue emission is dominant.…”