Hot carrier type exchange in inorganic electroluminescent thin films

摘要

The authors have observed the hot carrier type (holes or electrons) exchange in rare-earth-ion-activated strontium thiogallate (SrGa_2S_4) thin films by measuring the transient electroluminescent wave forms of the devices having a single insulating thin film. Measured wave forms revealed that the green electroluminescence of europium activated SrGa_2S_4 thin film occurs due to hot hole excitation. In contrast, the blue electroluminescence of cerium activated SrGa_2S_4 thin film occurs due to hot electron excitation. Hence, the hot carrier type is exchanged by the different rare-earth-ion doping.