Absorption studies of tripositive praseodymium and neodymium doped zinc fluoride borophosphate (ZFBP) glasses

Abstract

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Zinc fluoride borophosphate (ZFBP) glasses doped with tripositive praseodymium and neodymium ions have been prepared by melt quenching technique. The final composition of glasses in mol.% is 15.44 B₂O₃ – 39.77 P₂O₅ -17.36 Na₂O – 16.67 Al₂O₃ – 10.74 ZnF₂ – R Ln (where R= 0.0, 0.1, 0.3 and 0.5 mol % and Ln = Pr³⁺ and Nd³⁺). The absorption spectra of doped ZFBP glasses have been recorded at room temperature. Eight absorption bands have been observed from the ground state ³H₄ to excited states ³F_2,³F_3,³F_4,¹G_4, ¹D₂, ³P₀, ³P₁ and ³P₂ in Pr³⁺ doped ZFBP glasses and twelve absorption bands from the ground state ⁴I_9/2 to excited states ⁴F_3/2, ⁴F_5/2, ⁴F_7/2, ⁴S_3/2, ⁴F_9/2, ²H_11/2, ⁴G_5/2, ⁴G_7/2, ⁴G_9/2, ²G_9/2, ⁴G_11/2, and ²P_1/2 in the case of Nd³⁺ doped ZFBP glasses. From these spectral data various energy interaction parameters like Slater-Condon parameter <i style="">F</i>_k (<i style="">k</i>=2, 4, 6), Lande´ parameter ξ_4f and Racah parameters <i style="">E</i>^k (<i style="">k</i>=1,2,3) have been computed. Nephelauxetic ratio (<img src='/image/spc_char/beta.gif' border=0>') and bonding parameters (<i style="">b</i>^1/2) have also been computed from these parameters to study the nature of bonding in doped glasses. The intensities of the f-f transitions in the absorption spectra have been analyzed by the application of the Judd-Ofelt theory. J-O parameters (Ω_λ) have been computed. Ω_λ parameters of ZFBP glasses have been compared with those of similar glasses to infer the nature of bonding in these glasses.

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