Wydział Chemii

Piotr Solarz

Marcin Sobczyk

2012

Optical Materials

34

1826-1832

10.1016/j.optmat.2012.05.011

Naukowa

Angielski

Artykuł

The KZnLa_100%−xSm_x(PO₄)₂ (x = 0.1, 1, 5, 10 at.%) compounds have been synthesized by a conventional solid-state method. The powder pattern of sample was indexed on the basis of a monoclinic cell, space group P₁21/A, with the lattice parameters: a = 6.839, b = 7.703, c = 6.511 Å, z = 4 and V = 254.3 Å³. The emission spectra recorded at low temperature are composed of transitions from the ⁴G_5/2 multiplet to the ⁶H_5/2 (17 566, 17 656, 17 858 cm⁻¹), ⁶H_7/2 (16 472, 16 540, 16 723, 16 770 cm⁻¹), ⁶H_9/2 (15 281, 15 320, 15 406, 15 531, 15 569 cm⁻¹) and ⁶H_11/2 (13 961, 13 995, 14 045, 14 114, 14 223, 14 259 cm⁻¹). The spectroscopic properties were investigated in the range IR–VUV. It was found that the Sm³⁺ ions occupy position with one point symmetry site. The decay curves were pure exponential for 0.1–1 at.% of samarium and become non-exponential for higher Sm³⁺ concentrations. The Inokuti–Hirayama energy transfer process fit returns R₀ = 10.96 Å, C_da = 4.04 × 10⁻⁵² m⁶ s⁻¹ for S = 6. The electron–phonon coupling parameter α was found to be in the range 554–608 cm⁻¹ for lines centred at 17 858, 16 770, 16 723 and 15 569 cm⁻¹.

Samarium, luminescence, VUV, Electron–phonon coupling, Energy transfer, Inokuti–Hirayama

https://doi.org/10.1016/j.optmat.2012.05.011

http://www.elsevier.com