High-luminance Y-Ge-O system ternary compound phosphors using thin-film electroluminescent devices

摘要

High-luminance photoluminescence (PL) and electoroluminescence (EL) emissions were observed in new Mn-activated Y-Ge-O(Y{sub}2O{sub}3-GeO{sub}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{sup}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{sub}4GeO{sub}8:Mn, Y{sub}2GeO{sub}5 and Y{sub}2Ge{sub}2O{sub}7:Mn phosphor thin films prepared with a GeO{sub}2 content of 33, 50 and 67 mol.%, respectively, when driven at 1kHz(and 60Hz).