A study of optical properties of Sm3+ -doped M ' -type structure YTaO4 powders synthesized by the disodium tetraborate flux method

作者：Korzeniowski Kamil; Sobczyk Marcin^*

来源：Journal of Alloys and Compounds, 2018, 753: 717-724.

DOI：10.1016/j.jallcom.2018.04.162

• YTaO4
• Sm3+
• Judd-Ofelt analysis
• Luminescence properties
• Electron-phonon coupling
• Cross-relaxation

The Yi(1-x)Sm(x)TaO(4) (x = 0.1, 0.5,1.0, 2.0 and 5.0) compounds have been synthesized by conventional solid state method using disodium tetraborate as flux. The growth process of title compounds was studied using X-ray diffraction and electron microscopy (SEM and TEM). The powder diffraction pattern was indexed on a monoclinic cell, space group P2/a, lattice parameters: a = 5.302, b = 5.454 and c = 5.115 (A) over bar, Z = 2 and V = 146.97 (A) over bar (3). The absorption (300 K) and fluorescence spectra (5 and 300 K) as well as the fluorescence dynamics of the Sm3+:YTaO4 are presented and analysed in detail. The room-temperature absorption spectra have been analysed using the Judd-Ofelt approach. The intensity parameters have been evaluated and subsequently used to calculate fundamental spectroscopic parameters: the spontaneous transition probabilities, the branching ration, emission cross-sections and natural lifetime for the (4)G(4)(5/2) emitting level. The luminescence spectra recorded between 5 and 300 K are composed of transitions from the (4)G(4)(5/2) level to the H-6(5/2), H-6(7/2),H-6(9/2), H-6(11/2), H-6(13/2), H-6(15/2) F-6(1/2), F-6(3/2) and F-6(5/2) levels. The maximum emission cross-section has been calculated to be 0.935 and 0.985 x 10(-21) cm(2) at 609.1 and 657.1 nm, respectively. The electron-phonon coupling parameter alpha was found to be in the range 127 -512 cm(-1) for the (4)G(4)(5/2) -> H-6(5/2), (4)G(4)(5/2) -> H-6(7/2) and (4)G(4)(5/2) -> H-6(9/2) transitions.

• 出版日期2018-7-15