High Efficiency and Low Roll‐Off Hybrid WOLEDs by Using a Deep Blue Aggregation‐Induced Emission Material Simultaneously as Blue Emitter and Phosphor Host

Abstract OLEDs with high efficiency and low roll‐off are urgently needed to meet the constantly increasing commercial demands for white organic light‐emitting diodes (WOLEDs) in lighting industry applications. To enhance efficiency and decrease WOLED roll‐off, complicated doping technologies are employed, which result in an additional increase in costs. Herein, a deep‐blue‐light molecule (3TPA‐CN) with aggregation‐induced emission (AIE) is introduced as blue emitter and phosphor host to fabricate WOLEDs. By optimizing the emission zones, high efficiency and low roll‐off hybrid WOLEDs are achieved. The maximum forward‐viewing power and external quantum efficiencies reach 86.7 lm W −1 and 22.3%, and remain 59.2 lm W −1 and 19.6% at a luminance of 1000 cd m −2 , fully exhibiting the prospect of AIE molecules as a promising electroluminescence material for the fabrication of high‐performance WOLEDs.