title: Spectroscopic investigations on Pr³+ and Nd³+ doped strontium-lithium-bismuth borate glasses.
abstract: Spectroscopic investigations on different concentrations (0.1, 0.5, 1.0, 1.5 and 2.0mol%) of Pr(3+) and Nd(3+) doped strontium lithium bismuth borate glasses have been done. X-ray diffraction, SEM with EDS, absorption and luminescence spectra were recorded for all the glass matrices and analyzed. X-ray diffraction profiles and SEM images conformed amorphous nature of investigated glass samples. EDS spectra of host glass and Pr(3+)doped glass matrices gave information about the chemical composition of glass samples. From the absorption spectra of Pr(3+) and Nd(3+) ions, Judd-Ofelt (J-O) intensity parameters (Ω(λ),λ=2, 4 and 6) have been calculated and compared with other glass matrices. The emission characteristics such as radiative lifetimes (τ(R)), measured and calculated branching ratios (β) and stimulated emission cross-sections (σ(P)) have been obtained for the observed emission transitions of Pr(3+) and Nd(3+) ions in the above glass matrix for all the concentrations. From the emission spectra of Pr(3+) and Nd(3+) doped glass matrices, the effect of concentration on the quenching of intensity of (1)D(2)→(3)H(4) transition of Pr(3+) ion and (4)F(3/2)→(4)I(9/2), (4)I(11/2) and (4)I(13/2) transitions of Nd(3+) have been studied and discussed.
authors.affiliation: Department of Physics, Sri Venkateswara University, Tirupati 517 502, India.
authors.forename: D
authors.initials: D
authors.lastname: Rajesh
authors.forename: A
authors.initials: A
authors.lastname: Balakrishna
authors.forename: M
authors.initials: M
authors.lastname: Seshadri
authors.forename: Y C
authors.initials: YC
authors.lastname: Ratnakaram
mesh_terms: D000042:Absorption; D001729:Bismuth / Q000737:chemistry*; D001881:Borates / Q000737:chemistry*; D004583:Electrons; D005898:Glass / Q000737:chemistry*; D018020:Lithium Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D009354:Neodymium / Q000737:chemistry*; D011221:Praseodymium / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013052:Spectrometry, X-Ray Emission; D013324:Strontium / Q000737:chemistry*; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D001881:Borates; D018020:Lithium Compounds; D009354:Neodymium; C021051:lithium borate; D011221:Praseodymium; D001729:Bismuth; D013324:Strontium