34.2: High‐Luminance Thin‐Film EL Devices Using Mn‐Activated Multicomponent Oxide Phosphors

Abstract

High‐luminance thin‐film electroluminescent devices have been newly developed using Mn‐activated multicomponent oxide phosphors. Multicolor emission was obtained by changing the composition of CaO:Mn‐Ga₂O₃:Mn phosphor; luminances of 2790 and 592 cd/m² for yellow emission were obtained in a device using a phosphor with a CaO:Mn content of 50 molar%, when driven at 1 kHz and 60 Hz, respectively. Luminance of 4220 and 809 cd/m² for green emission were obtained in a device using Zn₂SiO₄:Mn‐Zn₂GeO₄:Mn phosphor with a Zn₂GeO₄:Mn content of 25 mol%, when driven at 1 kHz and 60 Hz, respectively. A high driving frequency has been demonstrated effective for oxide phosphor TFEL devices.