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    何益辉, 唐艳青, 谢凤鸣, 周经雄, 曾馨逸, 唐建新. D1-A-D2型高效红光热激活延迟荧光有机发光二极管[J]. 功能高分子学报, 2021, 34(5): 452-459. doi: 10.14133/j.cnki.1008-9357.20210204001
    引用本文: 何益辉, 唐艳青, 谢凤鸣, 周经雄, 曾馨逸, 唐建新. D1-A-D2型高效红光热激活延迟荧光有机发光二极管[J]. 功能高分子学报, 2021, 34(5): 452-459. doi: 10.14133/j.cnki.1008-9357.20210204001
    HE Yihui, TANG Yanqing, XIE Fengming, ZHOU Jingxiong, ZENG Xinyi, TANG Jianxin. High-Efficiency Organic Light-Emitting Diodes With D1-A-D2 Type Red Thermally Activated Delayed Fluorescence[J]. Journal of Functional Polymers, 2021, 34(5): 452-459. doi: 10.14133/j.cnki.1008-9357.20210204001
    Citation: HE Yihui, TANG Yanqing, XIE Fengming, ZHOU Jingxiong, ZENG Xinyi, TANG Jianxin. High-Efficiency Organic Light-Emitting Diodes With D1-A-D2 Type Red Thermally Activated Delayed Fluorescence[J]. Journal of Functional Polymers, 2021, 34(5): 452-459. doi: 10.14133/j.cnki.1008-9357.20210204001

    D1-A-D2型高效红光热激活延迟荧光有机发光二极管

    High-Efficiency Organic Light-Emitting Diodes With D1-A-D2 Type Red Thermally Activated Delayed Fluorescence

    • 摘要: 采用吩噁嗪(PXZ)片段作为具有分子刚性的强电子供体(D1)、三苯胺(TPA)片段作为具有大空间位阻的强电子供体(D2)、杂环芳烃构成的二苯并吩嗪(dibenzoa, cphenazine,BP)片段作为具有较强刚性的电子受体(A),开发了一种具有供体-受体-供体(D1-A-D2)型结构的新型高效红光热激活延迟荧光(TADF)材料(2T-BP-2P)。通过紫外-可见分光(UV-Vis)光谱、光致发光(PL)光谱、热重分析(TGA)和差示扫描量热(DSC)等对2T-BP-2P的光物理、电化学和热学性能进行了表征。结果表明,基于2T-BP-2P的器件实现了614.5 nm的红光发射,其外部量子效率(EQE)高达12.2%,国际照明委员会(CIE)坐标为(0.59,0.40)。

       

      Abstract: At present, the development of novel high performance red thermally activated delayed fluorescence (TADF) materials still faces great challenges. In this work, the phenoxazin (PXZ) fragment was used as the strong electron donor with molecular rigidity (D1), the triphenylamine (TPA) fragment was used as the strong electron donor with large steric hindrance (D2), and the dibenzoa, cphenazine (BP) fragment composed of heterocyclic aromatic hydrocarbon was used as the strong electron acceptor (A). With the three fragments, a new high efficiency red TADF emitter with donor-receptor-donor (D1-A-D2) structure, 4, 4'-(3, 6-di (10H-phenoxazin-10-yl) dibenzoa, cphenazine-11, 12-diyl) bis (N, N-diphenylaniline) (2T-BP-2P), was designed. The photophysical, electrochemical and thermal properties of 2T-BP-2P were characterized by ultraviolet-visible (UV-Vis) absorption, photoluminescence (PL), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. At the same time, 2T-BP-2P was characterized and confirmed by nuclear magnetic resonance (NMR) and mass spectrometry (MS) technology. Results showed that 2T-BP-2P had a high photoluminescence quantum yield (ΦPL) of 78.5% in the 15% mass fraction doped films with 4,4′-bis(N-carbazolyl)-1,1′-biphenyl(CBP) as a host material. The device based on 2T-BP-2P achieved red emission at 614.5 nm, maximum external quantum efficiency (EQEmax) of 12.2%, and the Commission International de l'Eclairage (CIE) coordinate of (0.59, 0.40). What’s more, the lowest turn-on voltage (Von) was 2.9 eV, and the highest power efficiency (PE) and current efficiency (CE) of the device were 17.37 lm/W and 17.70 cd/A, respectively. The superior performance of this device is at the leading level among the known red-doped TADF-organic light-emitting diodes (OLEDs). A new strategy for the future development of high-performance red-emitting OLEDs is provided.

       

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