Optical and luminescence properties of Pr³⁺ in Gd₂O₃-CaO-SiO₂-B₂O₃ glasses

This paper reports on the results concerning optical absorption and luminescence properties of 25Gd₂O₃-10CaO-10SiO₂-(55-x) B₂O₃-xPr₂O₃ (where x is 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol %) have been synthesized by melting and quenching process. The locations of the absorption peak observed are investigated for the first time. It is shown that the f-f transitions in the studied glasses are allowed by distortions of Pr³⁺ ions. Seven absorption bands corresponding to the ³H⁴ → ³P₂, ¹I₆+³P₁, ¹D₂, ¹G₄, ³F₄, ³F₃ and ³F₂, respectively absorption bands peaked at 459,483,575,1011,1418,1513 and 1931 nm. The luminescence intensity of Pr³⁺ doped glass under excited at 459 and 483 nm, the emission band under excited at 459 nm wavelengths emission centered at 542 nm (³P₀→³H₅), 602 nm (¹D2→³H₄), 646 nm (³P₀→³F₂) and 689 nm (¹D₂→³H₅).The emission bands with 483 nm excitation wavelength, the emission band centered at 532 nm (³P₁→³H₅), 602 nm (¹D₂→³H₄), 646 nm (³P₀→³F₂) and 725 nm (³P₀→³F₄), respectively. The present paper brings out the results pertaining to the studies carried out on different structural and optical absorption in UV-VIS-NIR region are also measured and discussed in term of energy levels, energy band gap and emission spectra of Pr³⁺ ions doped in Gd₂O₃-CaO-SiO₂-B₂O₃ glasses.