A Promising Multifunctional Deep-Blue Fluorophor for High-Performance Monochromatic and Hybrid White OLEDs with Superior Efficiency/Color Stability and Low Efficiency Roll-Off

作者：Ying, Shian; Liu, Wei; Peng, Ling; Dai, Yanfeng; Yang, Dezhi; Qiao, Xianfeng; Chen, Jiangshan; Wang, Lei^*; Ma, Dongge^*

来源：Advanced Optical Materials, 2022, 10(3): 2101920.

DOI：10.1002/adom.202101920

• deep-blue fluorescent materials
• efficiency roll-off
• fluorescent
• phosphorescent hybrid
• organic light-emitting diodes
• triplet-triplet annihilation

High-performance deep-blue fluorescent materials matching the required Commission Internationale de l'Eclairage y coordinate value (CIEy) of < 0.08 are much-needed in organic light-emitting diodes (OLEDs) for realizing the perfect application of full-color displays. However, deep-blue fluorophors commonly show unsatisfactory performance due to the intrinsic large bandgap characteristic. Here, the deep-blue nondoped OLED with the good CIE coordinates of (0.15, 0.07) and external quantum efficiency (EQE) of approximate to 9% is achieved based on a multifunctional and efficient anthracene-based fluorophor (2M-ph-3CzAnBzt). Using it as a host, the sky-blue fluorescent OLED realizes the maximum EQE of 9.50%, and keeps as high as 9.27% and 8.56% at 1000 and 5000 cd m(-2). More surprisingly, high-performance hybrid white OLEDs (WOLEDs) with good color stability and low roll-off are achieved by using it as the blue emitter. Two-color WOLED shows the forward-viewing efficiencies of 20.46%, and 76.80 lm W-1. The three-color WOLED emitting a candlelight with the color rendering index of >= 82 realizes the maximum EQE of 21.49% and remains 20.80% at 1000 cd m(-2). Such superior electroluminescence performance achieved in these OLEDs ranks among the highest values based on deep-blue fluorophors with CIEy < 0.08.

• 单位
  华中科技大学