Abstract
A new host material for electroluminescent (EL) phosphors consisting of Y_2O_3-based multicomponent oxide has been developed. High-luminance yellow-emitting thin-film EL (TFEL) device were fabricated using a newly developed Mn-activated (Y_2O_3)_<0.6>-(GeO_2)_<0.4> phosphor. Luminances above 6000 and 550 cd/m^2 and luminous efficencies above 0.6 and 4 lm/W were abtained in at TFEL device fabricated using a 0.5 μm-thick-((Y_2O_3)_<0.6>-(GeO_2)_<0,4> : Mn phophor thin film and driven at 1 kHz and 60 Hz, respectively.
