Strong Ultraviolet-Emitting ZnF₂:Gd Thin Film Electroluminescent Device

Abstract

A ZnF 2 :Gd thin film electroluminescent device was fabricated, and very strong ultraviolet (UV) emission was achieved from this device. This UV emission showed a sharp line at 311.5 nm assigned to the 6 P 7/2 → 8 S 7/2 transition of Gd 3+ ion. Blue photoluminescence was observed from the CaF 2 :Eu single crystal excited by the ZnF 2 :Gd electroluminescent device.