NEW THIN-FILM ELECTROLUMINESCENT MATERIAL ZNF2-MN

Both ac and dc orange (580 nm) electroluminescence (EL) are reported for thin films of ZnF2: Mn sandwiched between SiO semi-insulating films. All layers are formed by vacuum evaporation and no postdeposition annealing is required. Unique power input and efficiency-vs-frequency characteristics are observed, in part due to the 0.1-s lifetime of excited Mn in ZnF2; hysteresis in the brightness-voltage characteristic occurs. The brightness and power efficiency are found to be, respectively, 10 f L and 0.5% under suitable operating conditions.