Combining Emissions of Hole- and Electron-Transporting Layers Simultaneously for Simple Blue and White Organic Light-Emitting Diodes with Superior Device Performance

Combining emissions of hole- and electron-transporting layers simultaneously, a simple four-color hybrid white OLED realizes good white emission with a maximum CRI of 93–94 over a wide luminance range of 83.68–17 050 cd m−2, and also achieves a high EQE of 18.44%.