Intrinsic electronic excitations and impurity luminescent centres in NaMgF3 and MgF2 doped with Yb2+
Publication date
2020-01
Authors
Hughes-Currie, Rosa B.
Ivanovskikh, Konstantin V.
Wells, Jon Paul R.
Reid, Michael F.
Meijerink, A.
Editors
Advisors
Supervisors
Document Type
Article
Metadata
Show full item recordCollections
License
taverne
Abstract
The relaxation pathways of states in the energy region of the fundamental absorption of NaMgF3:Yb2+ and MgF2:Yb2+ are investigated using time-resolved vacuum ultraviolet spectroscopy. For NaMgF3:Yb2+, excitation into intrinsic free exciton states or above the band gap results in emission features associated with self-trapped excitons and impurity-trapped excitons. Excitation into host-related states of MgF2:Yb2+ similarly exhibits self-trapped exciton emission as well as emission from Yb2+ 4f135d states. The excitation features related to Yb2+ 4f14→4f135d transitions are interpreted using semi-empirical crystal field models. For both materials, the interplay between intrinsic distortions and Yb impurity centres, as the excitation wavelength and sample temperature are varied, is presented and analysed.
Keywords
Impurity-trapped exciton, Lanthanide, MgF2, NaMgF3, Self-trapped exciton, Synchrotron radiation, VUV spectroscopy, Ytterbium, Taverne, Electronic, Optical and Magnetic Materials, General Computer Science, Atomic and Molecular Physics, and Optics, Spectroscopy, Physical and Theoretical Chemistry, Organic Chemistry, Inorganic Chemistry, Electrical and Electronic Engineering
Citation
Hughes-Currie, R B, Ivanovskikh, K V, Wells, J P R, Reid, M F & Meijerink, A 2020, 'Intrinsic electronic excitations and impurity luminescent centres in NaMgF 3 and MgF 2 doped with Yb 2+', Optical Materials, vol. 99, 109553. https://doi.org/10.1016/j.optmat.2019.109553