Stimulated emission in electroluminescent CdF2 :TR3+ films
Bednarchuk D.I., Novoseletskii N.E., Filonenko V.V.
It is shown that stimulated emission is produced, due to population inversion by impact excitation, in electroluminescent CdF2:TR3+ (Eu, Er, Dy) films at field intensities exceeding a "threshold" value.