Multicoloured electroluminescence in CdF2

Abstract
Efficient multicoloured electroluminescence in MIS structures fabricated on conducting CdF2 crystals doped with rare earth impurities (Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm) is reported. A high-field impact excitation of RE centres is shown to be the most effective for the cubic symmetry centres. This phenomenon and differences in EL efficiency between RE impurities is discussed.