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Highly efficient green TADF organic light-emitting diodes by simultaneously manipulating hole and electron transport

机译：通过同时操纵孔和电子传输，高效的绿色TADF有机发光二极管

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摘要

This work demonstrates effective performance improvement by simultaneous manipulating of the hole injection and electron transport layers for (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl) isophthalonitrile (4CzIPN) based green thermally activated delayed fluorescent (TADF) organic light-emitting diodes (OLEDs). A 3 wt% sorbitol doped PEDOT:PSS layer results in the highest maximum current efficiency (CEmax) of 28.28 cd A(-1) and external quantum efficiency (EQE) of 17.04%. Single carrier devices denote that hole mobility gradually rises with the sorbitol ratio. The electroluminescence mainly originates from the emission of 4CzIPN. Atomic force microscopy images imply that 3 wt% sorbitol doped PEDOT:PSS film includes the largest PEDOT aggregate, which contributes to a higher electric conductivity thus the better performance of 3 wt% sorbitol doped device. Also the 4CzIPN ratio in the emissive layer was optimized, and 4 wt%-4CzIPN in CBP achieves the highest EQE of 20.99% and CEmax of 34.99 cd A(-1). The EL spectrum is independent of the luminous angle at a low 4CzIPN ratio but becomes more sensitive to the luminous angle at a high 4CzIPN ratio. Finally, we find out that the TADF OLED performance is very sensitive to TPBi thickness ranging from 20 nm to 65 nm, and 40 nm of TPBi achieves a CEmax up to 64.10 cd A(-1) and an excellent EQE of 25.14%, ascribing from its more balanced carrier transport.
机译：通过同时操纵（4s，6s）-2,4,5,6-四（9h-咔唑-9-基）脱氨酸（4czipn）的绿色热活化，通过同时操纵孔注射和电子传输层来证明有效的性能改善延迟荧光（TADF）有机发光二极管（OLED）。 A 3wt％山梨糖醇掺杂PEDOT：PSS层导致最高最大电流效率（CEMAX）为28.28℃（-1）和外部量子效率（EQE）为17.04％。单载体器件表示空穴迁移率随着山梨糖醇的比率逐渐上升。电致发光主要来自4czipn的排放。原子力显微镜图像意味着3wt％山梨糖醇掺杂PEDOT：PSS膜包括最大的佩特骨料，这有助于较高的电导率，因此3wt％山梨糖醇掺杂装置的性能更好。还优化了发光层中的4Czipn比，CBP中的4wt％-4Czipn达到了20.99％的最高EQE和34.99cd A（-1）的CEMAX。 EL光谱与低4CZIPN比的发光角度无关，但在高4CzIPN比率下对发光角度变得更敏感。最后，我们发现TADF OLED性能对TPBI厚度非常敏感，范围为20nm至65nm，40 nm的TPBI实现了高达64.10cd A（-1）的CEMAX和25.14％的优异EQE，ASCRIBE从其更平衡的载体运输。

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  • 来源
    《Nanotechnology》 |2019年第11期|共9页
  • 作者

    Wang Chao; Zheng Yan-Qiong; Tang Jie; Yu Jun-Le; Yang Fang; Wei Bin; Li Xi-Feng; Zhang Jian-Hua;

  • 作者单位

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

    Shanghai Univ Minist Educ Key Lab Adv Display &

    Syst Applicat 149 Yanchang Rd Shanghai 200072 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    green TADF OLED; sorbitol; PEDOT:PSS; 4CzIPN; carrier transport balance;

    机译：绿色TADF YOU;山梨糖醇;PEDOT：PSS;4CZIPN;载波运输平衡;

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