Abstract
A high-efficiency white organic light emitting diode with a power- efficiency of 34.9 lm/W (EQE =22.8 %) at 100 cd/m2, and 24.5 lm/W (EQE =18.8 %) at 1,000 cd/m2 will be presented. The high efficiency may be attributed to the use of electroluminescence efficient materials and effective host-to- guest energy transfer.