Abstract
A high-efficiency white organic light emitting diode with a power- efficiency of 34.9 lm/W (EQE = 22.8%) at 100 cd/m 2 , and 24.5 lm/W (EQE = 18.8%) at 1,000 cd/m 2 will be presented. The high efficiency may be attributed to the use of electroluminescence efficient materials and effective host-to-guest energy transfer.