A novel bipolar phosphorescent host for highly efficient deep-red OLEDs at a wide luminance range of 1000–10 000 cd m⁻²

Abstract

A novel phosphorescent host FPYPCA possessing the bipolar charge transporting ability realizes the most efficient deep-red PhOLED, which maintains very high-level EQEs of >23% at rather a high and wide luminance range of 1000-10 000 cd m(-2).