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-toguest energy transfer.
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