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%.