Fast and efficient VUV/UV emissions from (Ba,La)F2:Er crystals

We conclude that the 2G7/2 and 2F5/2 levels have major impact on VUV and UV emissions from the Er3+ ion in (Ba,La)F2 contributing to complex emission pattern described in this report Their key role, elucidated by the VUV and UV luminescence spectroscopy, is consistent with predictions from a simple configuration coordinate model based on experimental results and calculations of the 4f11 energy levels.