High-Luminance Y-Ge-O System Ternary Compound Phosphors Using Thin-Film Electroluminescent Devices

Abstract

High-luminance photoluminescence (PL) and electoroluminescence (EL) emissions were observed in new Mn-activated Y-Ge-O(Y_2O_3-GeO_2) system ternary compound phosphor thin films prepared by r.f.magnetron sputtering. Luminances of 2500 (68.1), 3020 (414) and 2590 (354) cd/m^2, and luminous efficiencies of 0.8 (3.4), 0.93 (3.3) and 0.22 (2.02)lm/W were obtained in TFEL devices using Y_4GeO_8Mn, Y_2GeO_5 and Y_2Ge_2O_7:Mn phosphor thin films prepared with a GeO_2 content of 33,50 and 67 mol.%. respectively. when driven at 1kHz(and 60Hz).