High-brightness green-emitting electroluminescent devices with ZnS:Tb,F active layers

Abstract
The dependence of brightness on the concentration ratio of fluorine to terbium was studied in thin-film electroluminescent devices with rf-sputtered ZnS:Tb,F active layers. It was found that the device exhibits a maximum brightness at the concentration ratio of about 1. By optimizing not only the concentration ratio but also the terbium concentration, a brightness more than 300 fL is obtained under 1 kHz pulse excitation.