Thin Film Electroluminescent Devices using New CaO-GaィイD22ィエD2OィイD23ィエD2 Phosphors

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Recently, oxide phosphors have attracted much attention as emitting layers for thin-film electroluminescent (TFEL) devices. For example, TFEL devices using either manganese-activated zinc-silicate (ZnィイD22ィエD2SiOィイD24ィエD2 : Mn) or manganese-activated zinc-gallate (ZnGaィイD22ィエD2OィイD24ィエD2 : Mn) phosphor as the emitting layer produced a high luminance EL emissions. In addition, multicomponent oxide phosphors such as ZnGaィイD22ィエD2OィイD24ィエD2 : Mn - ZnAlィイD22ィエD2OィイD24ィエD2 : Mn and ZnGaィイD22ィエD2OィイD24ィエD2 : Mn - ZnィイD22ィエD2SiOィイD24ィエD2 : Mn systems are promising as emitting layers for TFEL devices, because color coordinate control of the green emission can be realized by varying the composition in the multicomponent oxide host materials. However, only high luminances in green emission could be obtained using these oxide phosphors. In order to obtain high-luminance multicolor emissions from TFEL devices using oxide phosphors, it is necessary to develop new thin-film phosphor materials.In this research, we propose using a new multicomponent oxide phosphor composed of transition metal or rare earth element-doped CaO-GaィイD22ィエD2OィイD23ィエD2 system phosphor, as the emitting layser for TFEL devices. To achieve this, we fabricated TFEL devices using CaO-GaィイD22ィエD2OィイD23ィエD2 phosphor thin-film emitting layers combined with a BaTiOィイD23ィエD2 ceramic sheet insulating layer. For example, the emission color from TFEL devices using CaO-GaィイD22ィエD2OィイD23ィエD2 : Mn phosphors was changed from orange to green by varying the composition of the phosphors.No degradation of EL characteristics was observed in these TFEL devices, even when driven at 10 kHz.