Simultaneous Realization of High EQE of 30%, Low Drive Voltage, and Low Efficiency Roll‐Off at High Brightness in Blue Phosphorescent OLEDs

A blue organic light-emitting device that simultaneously realizes a driving voltage of 3.25 V, external quantum efficiency of 30%, and a power efficiency of 78 lm W−1 at 1000 cd m−2 is developed. By using a mixed-host system, the device shows ≈1.4 times higher power efficiency than that of the corresponding double emission layer at a high brightness. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.