Elucidation of the electron transfer mechanism in Eu2+ and Sm3+ codoped CaF2: A step towards better understanding of trapping and detrapping in luminescent materialsRemoveJonas J. Joos, David Van der Heggen, Lucia Amidani, Luis Seijo, and Zoila BarandiaránPhys. Rev. B 104, L201108 (2021)