Lanthanide 4f-level Location In Lanthanide Doped And Cerium-lanthanide Codoped Nalaf_4 By Photo- And Thermoluminescence

摘要

Photo- and thermoluminescence (TL) spectra of NaLaF_4:Ln~(3+) (Ln=Ce,Pr,Nd,Sm,Eu, Gd,Tb,Dy,Ho,Er,Tm) and NaLaF_4:Ce~(3+), Ln~(3+) (Ln=Nd,Sm,Ho,Er,Tm) are presented and used together with the empirical Dorenbos model in order to establish the 4/ energy level positions of all tri- and divalent lanthanide ions doped in NaLaF_4. The information will be presented in the form of an energy level diagram. It is shown that in addition to this diagram only two assumptions, viz., the presence of two host related electron traps and the presence of V_k-centers, are necessary for explaining the lanthanide-specific TL glow curves of both Ln mono- and Ce-Ln codoped NaLaF_4.