Mn-Activated CaO–Ga2O3 Phosphors for Thin-Film Electroluminescent Devices

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Multicomponent oxide phosphors such as Mn-activated CaO–Ga2O3 are demonstrated to be very promising as the thin-film emitting layer for thin-film electroluminescent (TFEL) devices. The EL emission color from CaO–Ga2O3:Mn TFEL devices changed from green to orange as the CaO content was increased from 0 to 100 mol%. A Ga2O3:Mn TFEL device driven at 1 kHz produced a green emission with a luminance of 232 cd/m2. A yellow emission with a luminance of 1725 and 261 cd/m2 was obtained in a TFEL device using a CaGa2O4:Mn thin film prepared with a CaO content of 50 mol%, when driven at 1 kHz and 60 Hz, respectively.