Intrinsic electronic excitations and impurity luminescent centres in NaMgF3 and MgF2 doped with Yb2+

Rosa B. Hughes-Currie, Konstantin V. Ivanovskikh, Jon Paul R. Wells*, Michael F. Reid, Andries Meijerink

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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.

Original languageEnglish
Article number109553
JournalOptical Materials
Volume99
DOIs
Publication statusPublished - Jan 2020

Keywords

  • Impurity-trapped exciton
  • Lanthanide
  • MgF2
  • NaMgF3
  • Self-trapped exciton
  • Synchrotron radiation
  • VUV spectroscopy
  • Ytterbium

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