Stef Marius, Schornig Carla, Buse Gabriel
Faculty of Physics, West University of Timisoara, Bd. V. Parvan 4, 300223 Timisoara, Romania.
Institute for Advanced Environmental Research, West University of Timisoara, 300086 Timisoara, Romania.
Materials (Basel). 2025 Apr 23;18(9):1915. doi: 10.3390/ma18091915.
A BaF single crystal co-doped with Er⁺ and Yb⁺ was grown by the vertical Bridgman technique and investigated for its optical and dielectric properties. Judd-Ofelt analysis yielded intensity parameters Ω = 0.59, Ω = 0.38, and Ω = 0.27 (×10 cm), 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 × 10 cm. These results support the suitability of Er⁺,Yb⁺ co-doped BaF crystals for luminescent and dielectric applications in advanced photonic materials.
采用垂直布里奇曼技术生长了共掺杂Er⁺和Yb⁺的BaF单晶，并对其光学和介电性能进行了研究。Judd-Ofelt分析得出强度参数Ω₂ = 0.59、Ω₄ = 0.38和Ω₆ = 0.27（×10⁻²⁰ cm⁻²），品质因数χ = 1.41，表明存在强辐射跃迁。在紫外和近紫外激发下，观察到321、405、518和536 nm处的发射，辐射寿命在1.1至3.4 ms之间。确定了一个单一的介电弛豫过程，其激活能为0.58 eV，与三角近邻近邻（NNN）偶极相关。估计NNN偶极浓度约为2.5×10¹⁸ cm⁻³。这些结果支持了Er⁺、Yb⁺共掺杂BaF晶体适用于先进光子材料中的发光和介电应用。
