Highly Efficient Electroluminescent Materials with High Color Purity Based on Strong Acceptor Attachment onto B-N-Containing Multiple Resonance Frameworks
作者机构：State Key Laboratory of Supramolecular Structure and MaterialsCollege of ChemistryJilin UniversityChangchun 130012 Jihua LaboratoryFoshan 528200Guangdong Province
出 版 物：《CCS Chemistry》 (中国化学会会刊（英文）)
年 卷 期：2022年第4卷第6期
页 面：2065-2079页
学科分类：07[理学] 070303[理学-有机化学] 0703[理学-化学]
基 金：supported by the National Natural Science Foundation of China(no.21935005) the National Key R&D Program of China(no.2020YFA0714601) Program for JLU Science and Technology Innovative Research Team(no.2019TD-33).
主 题：organic light-emitting diode multiple resonance narrowband emission high color purity thermally activated delayed fluorescence
摘 要：The development and enrichment of organic materials with narrowband emission in longer wavelength regions beyond 515 nm still remains a great challenge.Herein,a synthetic methodology for narrowband emission materials has been proposed to functionalize multiple resonance(MR)skeletons and generate a universal building block,namely,the key intermediate DtCzB-Bpin,which can be utilized to construct multifarious thermally activated delayed fluorescence(TADF)materials with high color purity through a simple one-step Suzuki coupling reaction.Based on this unique synthetic strategy,a series of efficient narrowband green TADF emitters has been constructed by localized attachment of 1,3,5-triazine and pyrimidine derivatives-based acceptors onto B–N-containing MR frameworks with 1,3-bis(3,6-di-tertbutylcarbazol-9-yl)benzene(DtCz)as the ligand.The precise modulation of the acceptor is an intelligent approach to achieve bathochromic shift and narrowband emission simultaneously.The DtCzB-TPTRZbased organic light-emitting diode(OLED)exhibits pure green emission with Commission Internationale de L’Eclairage(CIE)coordinates of(0.23,0.68),a maximum external quantum efficiency(EQE)of 30.6%,and relatively low efficiency roll-off.
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