Intrinsic electronic excitations and impurity luminescent centres in NaMgF3 and MgF2 doped with Yb2+
Copyright policy )Intrinsic electronic excitations and impurity luminescent centres in NaMgF3 and MgF2 doped with Yb2+
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.
- Utrecht University Netherlands
- Deutsches Elektronen-Synchrotron DESY Germany
- The Dodd-Walls Centre for Photonic and Quantum Technologies New Zealand
- Massey University New Zealand
- Victoria University of Wellington New Zealand
Self-trapped exciton, SELF TRAPPED EXCITONS, ENERGY GAP, Impurity-trapped exciton, Lanthanide, MgF2, Ytterbium, LANTHANIDE, YTTERBIUM COMPOUNDS, SELF-TRAPPED EXCITON, VUV SPECTROSCOPY, info:eu-repo/classification/ddc/670, Synchrotron radiation, EXCITONS, MAGNESIUM COMPOUNDS, NAMGF3, ULTRAVIOLET SPECTROSCOPY, CRYSTAL IMPURITIES, NaMgF3, TRAPPED EXCITON, YTTERBIUM, IMPURITY-TRAPPED EXCITON, SYNCHROTRON RADIATION, MGF2, RARE EARTH ELEMENTS, VUV spectroscopy
Self-trapped exciton, SELF TRAPPED EXCITONS, ENERGY GAP, Impurity-trapped exciton, Lanthanide, MgF2, Ytterbium, LANTHANIDE, YTTERBIUM COMPOUNDS, SELF-TRAPPED EXCITON, VUV SPECTROSCOPY, info:eu-repo/classification/ddc/670, Synchrotron radiation, EXCITONS, MAGNESIUM COMPOUNDS, NAMGF3, ULTRAVIOLET SPECTROSCOPY, CRYSTAL IMPURITIES, NaMgF3, TRAPPED EXCITON, YTTERBIUM, IMPURITY-TRAPPED EXCITON, SYNCHROTRON RADIATION, MGF2, RARE EARTH ELEMENTS, VUV spectroscopy
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