2015/11/02 by Е. А. Раджабов, E A Radzhabov, Roman Shendrik +3
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Glass properties and applications #Inorganic Fluorides and Related Compounds #Luminescence Properties of Advanced Materials #Materials Science (cond-mat.mtrl-sci) #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1511.00385
presented on LUMDETR2015 conference, submitted to Radiation Measurements
arxiv created 2015/11/02 · openalex publication_date 2015/11/02 · arxiv updated 2015/11/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Optical spectra (absorption, emission, excitation, decay) and dielectric relaxation were measured for divalent europium (and partially for ytterbium) in lanthanum fluoride crystals. Absorption of Eu2+ contains not only asymmetric weakly structured band at 245 nm but also long-wavelength bands at 330, 380 nm. Broadband Eu2+ emission at 600 nm appeared below 80 K, having decay time 2.2 μs at 7.5 K. Emission at 600 nm is attributed to so-called anomalous luminescence. Bulk conductivity is directly proportional to absorption coefficient of Eu2+ bands. Dielectric relaxation peak of LaF3-EuF3 is attributed to rotation of dipoles Eu2+-anion vacancy. The long-wavelength absorption bands at 330, 380 nm are assigned to transitions from 4f7 Eu2+ ground state to states of neighbouring fluorine vacancy.