首页|Realizing External Quantum Efficiency over 25％with Low Efficiency Roll-Off in Polymer-Based Light-Emitting Diodes Synergistically Utilizing Intramolecular Sensitization and Bipolar Thermally Activated Delayed Fluorescence Monomer
Realizing External Quantum Efficiency over 25％with Low Efficiency Roll-Off in Polymer-Based Light-Emitting Diodes Synergistically Utilizing Intramolecular Sensitization and Bipolar Thermally Activated Delayed Fluorescence Monomer
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Since polymer-based light-emitting diodes(PLEDs)are well-suited building blocks for large-area and low-cost flexible display equipment,state-of-the-art thermally activated delayed fluorescence(TADF)PLEDs are in high demand.To respond to this demand,light-emitting TADF units have initially been modified with electron-transporting units to balance the carrier transport of regiorandom TADF poly-mers,and simultaneously,an intramolecular sensitizing strategy has also been employed by covalently incorporat-ing TADF sensitizers with light-emitting TADF units and hosts in conjugated polymers to accelerate the spin-flip of triplet excitons.Superior photophysical properties have been achieved by a rational regulation of the proportions of each component,achieving a photoluminescence quan-tum yield of 90％,an extremely high rate of reverse intersys-tem crossing of 3 × 106 s-1,and a relatively low nonradiative decay rate of around 105 s-1.As a result,the solution-processed PLEDs can attain an external quantum efficiency(EQE)value of 25.4％with emission peaks of around 550 nm,representing record-high performance for PLEDs.The effi-ciency roll-off can also be significantly suppressed,main-taining an EQE value of 24.2％at 1000 cd/m2 with ideal efficiency roll-off of lower than 5％.Encouragingly,this work provides a valid strategy to tackle the imperative need for PLEDs with high EQE and low efficiency roll-off.
Yuchao Liu、Yanchao Xie、Lei Hua、Xingwen Tong、Shian Ying、Zhongjie Ren、Shouke Yan
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Key Laboratory of Rubber-Plastics,Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics,Qingdao University of Science and Technology,Qingdao 266042
State Key Laboratory of Chemical Resource Engineering,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029
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