Highly efficient white organic light-emitting diodes with over 100lm/W for next-generation solid-state lighting

摘要

High-performance two-unit all-phosphorescent white devices on a built-up light extraction substrate that comprised high-index materials were studied. As a result of suitable optical and electrical design, the device showed an extremely high efficacy of 114lm/W at 1000cd/m~2. The device also showed 102lm/W with long lifetime (LT70) of over 10,000h at 3000cd/m~2. Outstanding external quantum efficiency of almost 50% was also achieved in a flat panel with an emissive area of 25 cm~2. Color coordinates of the panel met the Energy Star® criteria of solid-state lighting with CIE (Commission Internationale de I'Eclairage) 1931 (x, y) = (0.477,0.423), and the color rendering index was 81.