Investigation of Luminescence Characteristics of SrLaGa₃O₇:Dy³⁺ Phosphors

Abstract

We synthesized Dy3+ doped SrLaGa3O7 phosphors via a sintering process at 1350 °C under atmosphere. The X-ray diffraction data demonstrate that they have the pure tetragonal phase, meaning the successful substitution of Dy3+ in SrLaGa3O7 host. Monitoring at 572 nm, Dy3+ doped SrLaGa3O7 phosphors show a series of excitation bands within 275–475 nm. Exciting at 342 nm, Dy3+ doped SrLaGa3O7 phosphors show emission bands in the range of 450–700 nm. The emission bands respectively locate in blue, yellow and right light regions, which respectively correspond to 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 transitions of Dy3+. The concentration quenching is induced by dipole-dipole interactions among neighboring Dy3+ ions. There is only one peak in the thermoluminescence glow curves of Dy3+ doped SrLaGa3O7 phosphors, indicating that there is only one type of trap center in these phosphors. The trap depth is calculated to be 0.754 eV.

Dy3+ → Eu3+ Energy Transfer in SrLaGa3O7:Dy3+/Eu3+ Phosphors

“…The broad band in the shorter wavelength region is a CTB induced by the O 2− → Dy 3+ charge transfer absorption, but other bands come from the f → f transitions of Dy 3+ . 6,11 All of the transitions are distinguished and signaled detailedly in the left spectrum of Fig. 2B.…”

“…In Dy 3+ /Eu 3+ doped SrLaGa 3 O 7 phosphors, Dy 3+ /Eu 3+ ions occupy lattice sites and substitute La 3+ ions. 6,19 Figure 2 displays the luminescence spectra of SrLaGa 3 O 7 : 0.02Eu 3+ (A), SrLaGa 3 O 7 :0.04Dy 3+ (B) and SrLaGa 3 O 7 :0.04Dy 3+ / 0.02Eu 3+ (C) phosphors. As we can see in Fig.…”

“…For example, erbium(III) (Er 3+ ), holmium(III) (Ho 3+ ) and thulium(III) (Tm 3+ ) are widely used as luminescence centers in up-conversion phosphors and ytterbium(III) (Yb 3+ ) can act as the sensitizer of these RE ions. 1 Cerium(III) (Ce 3+ ), 2 europium(II) (Eu 2+ ), 3 europium(III) (Eu 3+ ), 4 terbium(III) (Tb 3+ ), 5 dysprosium(III) (Dy 3+ ) 6 et al are widely used as luminescence centers in down-conversion phosphors and part of them can act as the sensitizers to improve the emission of the activators in sensitizer/activator codoped phosphors via the energy transfer processes. Up to now, some energy transfer processes have been reported, such as Ce 3+ → Eu 2+ , 7 Ce 3+ → Tb 3+ , 8 Tb 3+ → Eu 3+9 and Dy 3+ → Eu 3+ .…”

Luminescence Characteristics of Dy3+/Eu3+ Doped CaBi2Ta2O9 Phosphors

“…As one of widely used activators, dysprosium (Dy 3+ ) ions generally show emission bands corresponding to the 4 F 9/2 → 6 H 15/2,13/2,11/2 transitions. 10 Herein, the 4 F 9/2 → 6 H 13/2 transition is a hypersensitive transition. The emission band corresponding to this transition will be prominent while Dy 3+ ions locate in the sites without inversions.…”

Luminescence and Energy Transfer of Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) Phosphors

“…[7][8][9][10] Particularly, these phosphors with different emission colors could be created through selecting one appropriate lanthanide ion and proper control of their dopants. The single-component rare-earthdoped phosphors such as the red emission color of NaSrLa(MO 4 ) 3 : Eu [M = Mo and W] 11 and Ba 3 Y 4 O 9 : Eu 12 derived from the 5 D 0 → 7 F 1,2 transitions of Eu 3+ ion, the adjustable ones of Ca 3 Sc 2 Si 3 O 12 : Dy, 13 Ca 3 MgSi 2 O 8 : Dy 14 and SrLaGa 3 O 7 : Dy 15 caused by the ratio of magnetic and electric dipole transitions of Dy 3+ ion, the blue ones of NaCaBO 3 : Tm, 16 ZnB 2 O 4 : Tm 17 and Li 6 CaLa 2 Nb 2 O 12 : Tm 18 beacuse of 1 D 2 → 3 F 4 transition of Tm 3+ ion, the green ones of NaBaY(BO 3 ) 2 : Tb and NaLaMgWO 6 :Tb 19 on account of 5 D 4 → 7 F 5 transition of Tb 3+ ion 20 have been investigated.…”