Inorganic El Devices With High-performance Blue Phosphor And Application To 34-in. Flat-panel Televisions

摘要

A high-performance inorganic electroluminescence (EL) device has been successfully developed by using an EL structure with a thick dielectric layer (TDEL) and sputtered BaAl_2S_4:Eu blue phosphor. The luminance and efficacy were higher than 2300 cd/m~2 and 2.5 lm/W at L_(60), 120 Hz, respectively. Furthermore, the luminance at L_(60), 1.2 kHz was more than 23,000 cd/m~2. The phosphor layer has a single phase and a highly oriented crystalline structure. The phosphor also shows high stability in air. A 34-in. high-definition television (HDTV) has been developed by combining a TDEL structure and color-conversion materials. The panels with an optimized color filter demonstrated a peak luminance of 350 cd/m~2, a color gamut of more than 100% NTSC, and a wide viewing angle similar to that of plasma-display panels. The high reproducibility of the 34-in. panels using our pilot line has been confirmed.