The unusual temperature dependence of the Eu${}^{2+}$ fluorescence lifetime in CaF${}_2$ crystals

C. K. Duan, A. Mejerink, R. J. Reeves +1

Fluorescence lifetimes of Eu${}^{2+}$ doped in CaF${}_2$ are measured at various temperatures between 4K and 450K. The lifetime increases with between 100K and 300K, in contrast to the…