Highly efficient white OLEDs with single solution‐processed emitting layer fabricated by one‐step coating using self‐layered technique

We propose a self‐layered technique to form an emitting layer with a pseudo‐multilayered structure by one‐step coating and demonstrate the feasibility of its concept. We also fabricated a highly efficient white organic light‐emitting diode with the proposed technique. A maximum power efficiency of 70 lm/W was obtained by improving the effective radiation efficiency, carrier balance efficiency, and light‐extraction efficiency.