Achieving High Efficiency at High Luminance in Fluorescent Organic Light‐Emitting Diodes through Triplet–Triplet Fusion Based on Phenanthroimidazole‐Benzothiadiazole Derivatives
Xiangyang Tang, Hui Liu, Lei Xu, Xuehui Xu, Xin He, Futong Liu, Jianwu Chen, Qiming Peng
Abstract
Abstract Achieving high efficiency at high luminance is one of the most important prerequisites towards practical application of any kind of light‐emitting diode (LED). Herein, we report highly emissive organic fluorescent molecules based on phenanthroimidazole‐benzothiadiazole derivatives capable of maintaining high external quantum efficiency (EQE) at high luminance enabled by triplet–triplet fusion (TTF) in doped organic LEDs. The PIBzP‐, PIBzPCN‐, and PIBzTPA‐based devices showed EQEs of 8.27, 9.15, and 8.64 %, respectively, at luminance of higher than 1000 cd m −2 , with little efficiency roll‐off.
Topics & Concepts
LuminanceOLEDFluorescenceFusionQuantum efficiencyOptoelectronicsDiodeMaterials scienceLight-emitting diodeChemistryOpticsPhysicsNanotechnologyLinguisticsPhilosophyLayer (electronics)Organic Light-Emitting Diodes ResearchOrganic Electronics and PhotovoltaicsLuminescence and Fluorescent Materials