Year: 2025
Type: article
Abstract: A BaF2 single crystal co-doped with Er3⁺ and Yb3⁺ was grown by the vertical Bridgman technique and investigated for its optical and dielectric properties. Judd–Ofelt analysis yielded intensity parameters Ω2 = 0.59, Ω4 = 0.38, and Ω6 = 0.27 (×10−20 cm2), with a quality factor χ = 1.41, indicating strong radiative transitions. Under UV and near-UV excitation, emissions at 321, 405, 518, and 536 nm were observed, with radiative lifetimes ranging from 1.1 to 3.4 ms. A single dielectric relaxation process was identified, with activation energy of 0.58 eV and associated with trigonal NNN dipoles. The NNN dipole concentration was estimated at ~2.5 × 1018 cm−3. These results support the suitability of Er3⁺,Yb3⁺ co-doped BaF2 crystals for luminescent and dielectric applications in advanced photonic materials.
Source: Materials
DOI: 10.3390/ma18091915
Authors: Marius Stef, Carla Schornig, Gabriel Buse
Institution: West University of Timişoara
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
Funder: European Commission
OpenAlex ID: W4409730692