High-Luminance Green Zn₂SiO₄:Mn Thin-Film Electroluminescent Devices Using an Insulating BaTiO₃ Ceramic Sheet

Abstract

High-luminance green emission has been achieved from an electroluminescent (EL) device consisting of a Zn 2 SiO 4 :Mn thin-film phosphor and a thick BaTiO 3 ceramic insulator. The EL characteristics are strongly dependent on the preparation conditions of the Zn 2 SiO 4 :Mn thin film deposited by rf magnetron sputtering. The high-luminance green emission, which results from the 4 G- 6 S transition in the Mn 2+ ion, is obtained in a device using a Zn 2 SiO 4 :Mn thin film postannealed at 1000°C. A luminance of 3400 cd/m 2 and a maximum luminous efficiency of 0.15 lm/W were obtained in the device driven with a sinusoidal-wave voltage of 430 V at 5 kHz.