Blue phosphorescent organic light-emitting diodes (PHOLEDs) with high efficiency and lifetime were developed by exciton harvesting layer at electron transport layer. A green emitter doped electron transport layer was able to harvest the triplet excito...
Blue phosphorescent organic light-emitting diodes (PHOLEDs) with high efficiency and lifetime were developed by exciton harvesting layer at electron transport layer. A green emitter doped electron transport layer was able to harvest the triplet exciton in the blue PHOLEDs, which improved the lifetime and the efficiency of the blue PHOLEDs compared with a common electron transport layer. The exciton harvesting layer blocked blue triplet emitter from triplet exciton quenching.