title: Ho3+-doped strontium-aluminium-bismuth-borate glasses for green light emission.
abstract: Strontium-aluminium-bismuth-borate glasses (SAlBiB) doped with different concentrations of Ho(3+) were prepared using conventional melt quenching technique and their structural and optical properties investigated. X-ray diffraction and scanning electron microscopy analysis were used to study the structural properties. Optical properties were studied by measuring the optical absorption and visible luminescence spectra. The Judd-Ofelt (J-O) theory was applied to evaluate J-O intensity parameters, Ω(λ) (λ = 2, 4 and 6). Using J-O intensity parameters, radiative properties such as spontaneous transition probabilities (A(R)), branching ratios (β(R)) and radiative lifetimes (τ(R)) were determined. From the emission spectra, a strong green emission nearly at 549 nm corresponding to the transition, (5)S2 ((5)F4)→(5)I(8) was observed. Emission peak positions (λ(P)), effective bandwidths (Δλ(eff)) and stimulated emission cross-sections (σ(p)) were calculated for the observed emission transitions, (5)F3 →(5)I(8), (5)S2((5)F4)→(5)I(8) and (5)F5 →(5)I(8) of Ho(3+) in all the glass matrices. Chromaticity color coordinates were calculated using the emission spectra. The experimental results suggest that SAlBiB glass matrix with 1.5 mol% of Ho(3+) has better emission properties.
authors: Department of Physics, Sri Venkateswara University, Tirupati-517502, India.
authors: D
authors: D
authors: Rajesh
authors: M
authors: M
authors: Dhamodhara Naidu
authors: Y C
authors: YC
authors: Ratnakaram
authors: A
authors: A
authors: Balakrishna
mesh_terms: D000535:Aluminum / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry; D001881:Borates / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006695:Holmium / Q000737:chemistry*; D008027:Light; D049449:Luminescence; D013324:Strontium / Q000737:chemistry
chemical_list: D001881:Borates; D000535:Aluminum; D001729:Bismuth; D006695:Holmium; D013324:Strontium
keywords: EDS; XRD; absorption; luminescence