High-efficiency Technology of White OLEDs

High-performance all-phosphorescent white devices on a light outcoupling substrate which comprised high-index materials were investigated. The two-unit device composed of the red/blue and red/green phosphorescent units on the light outcoupling substrate achieved high light coupling efficiency of 49%. An electrically and optically optimized two-unit of all phosphorescent white OLED realized low driving voltage of 5.5 V, high luminous efficacy of 114 lm/W and half decay lifetime of over 120,000 h at 1,000 cd/m(2).