Low-voltage tunnel-injection blue electroluminescence in ZnS MIS diodes

Abstract
Tunnel‐injection green and blue electroluminescence in ZnS tunnel MIS diodes with alkali halide insulator layers is reported. Complete films down to 59 Å average thickness and external quantum efficiencies up to 1.1×10−5 have been achieved. The trend of the data is an increase in external quantum efficiency for a decrease in insulator layer thickness. The measured interface state density is on the order of 1014 cm−2 eV−1.