Extremely efficient white organic light-emitting diodes for general lighting

Highly power-effi cient white organic light-emitting diodes (OLEDs) are still challenging to make for applications in high-quality displays and general lighting due to optical confi nement and energy loss during electron-photon conversion. Here, an effi cient white OLED structure is shown that combines deterministic aperiodic nanostructures for broadband quasi-omnidirectional light extraction and a multilayer energy cascade structure for energy-effi cient photon generation. The external quantum effi ciency and power effi ciency are raised to 54.6% and 123.4 lm W -1 at 1000 cd m -2 . An extremely small roll-off in effi ciency at high luminance is also obtained, yielding a striking value of 106.5 lm W -1 at 5000 cd m -2 . In addition to a substantial increase in effi - ciency, this device structure simultaneously offers the superiority of angular color stability over the visible wavelength range compared to conventional OLEDs. It is anticipated that these fi ndings could open up new opportunities to promote white OLEDs for commercial applications.