Impact of Tb³⁺ ion concentration on the morphology, structure and photoluminescence of Gd₂O₂SO₄:Tb³⁺ phosphor obtained using thermal decomposition of sulfate hydrate

Abstract

Gadolinium oxysulfate doped with terbium (Gd2O2SO4:Tb3+; 0.1, 1.0, and 10.0 mol%) materials were obtained using thermal decomposition from sulfate hydrate under a dynamic air atmosphere and between 1320–1400 K. The materials were characterized using Fourier transform infrared spectroscopy, thermogravimetric/derivative thermogravimetric investigations and X‐ray powder diffraction patterns. The Tb2O2SO4 compound was obtained at 1300 K and was used to compare thermal stability and photoluminescence behaviour with that of Gd2O2SO4:Tb3+ (0.1, 1.0, and 10.0 mol%). Magnetic susceptibility measurements indicated the presence of 15% Tb4+ phases within Tb2O2SO4. The materials were excited at 377 nm and displayed green narrow lines with the strongest emission peak at 545.5 nm due to the 5D4→7F5 transition of Tb3+ ions. Brightness of terbium‐activated gadolinium oxysulfate phosphors was enhanced with increase in the concentration of Tb3+. Detailed analysis of spectroscopic properties of materials under investigations revealed efficient Gd2O2SO4 to Tb3+ and Tb3+ to Tb3+ energy transfers. Increase in dopant concentration led to the enhancement of 5D4→7FJ emission intensity and reduction of 5D3→7FJ emission intensity via cross‐relaxation mechanisms. Distribution of particle size was increased by controlling dopant concentration in the host lattice. Obtained results confirmed that these materials could be applied potentially in field emission display devices and light‐emitting diodes.

A Study of Tb3+ → Eu3+ Energy Transfer in Tb3+/Eu3+ Codoped Y2Mg2Al2Si2O12 Phosphors

“…The emission band corresponding to 5 D 4 → 7 F 5 transition has the highest intensity, which is well according with the earlier reports. [2][3][4][5][6]36 While the emission coming from the 5 As we can see in Fig. 3 (x = 0.02, 0.04, 0.06, 0.08 and 0.10) phosphors.…”

“…For example, as a widely used green luminescence center, Tb 3+ ions generally show emission bands corresponding to 5 D 4 → 7 F 6, 5, 4, 3 transitions and the emission corresponding to 5 D 4 → 7 F 5 transition is dominated. [2][3][4][5][6] However, as a widely used red luminescence center, Eu 3+ ions generally show emission bands corresponding to 5 D 0 → 7 F 1, 2, 3, 4 transitions and the relative intensities of 5 D 0 → 7 F 1, 2 transitions depend on the host. The emission induced by 5 D 0 → 7 F 1 transition is dominated while they are in situations with the inversion symmetry, such as TbBO 3 , 7 NaCaBi(TeO 6 ) 8 and Ba 2 Ln 2/3 TeO 6 (Ln = La, Pr, Ng, Sm and Eu).…”

“…[2][3][4][5][6] However, as a widely used red luminescence center, Eu 3+ ions generally show emission bands corresponding to 5 D 0 → 7 F 1, 2, 3, 4 transitions and the relative intensities of 5 D 0 → 7 F 1, 2 transitions depend on the host. The emission induced by 5 D 0 → 7 F 1 transition is dominated while they are in situations with the inversion symmetry, such as TbBO 3 , 7 NaCaBi(TeO 6 ) 8 and Ba 2 Ln 2/3 TeO 6 (Ln = La, Pr, Ng, Sm and Eu). 9 The emission induced by 5 D 0 → 7 F 2 transition is dominated while they are in situations without the inversion symmetry, such as CaYAl 3 O 7 , 10 NaREMgWO 6 (RE = La, Gd, Y) 11 and Ca 2 YZr 2 Al 3 O 12 .…”

“…The emission induced by 5 D 0 → 7 F 1 transition is dominated while they are in situations with the inversion symmetry, such as TbBO 3 , 7 NaCaBi(TeO 6 ) 8 and Ba 2 Ln 2/3 TeO 6 (Ln = La, Pr, Ng, Sm and Eu). 9 The emission induced by 5 D 0 → 7 F 2 transition is dominated while they are in situations without the inversion symmetry, such as CaYAl 3 O 7 , 10 NaREMgWO 6 (RE = La, Gd, Y) 11 and Ca 2 YZr 2 Al 3 O 12 . 12 Energy transfer is one of effective ways to generate interesting multi-color and tunable emission in phosphors with sensitizers and activators.…”