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Modeling of flexible light extraction structure: Improved flexibility and optical efficiency for organic light-emitting diodes

机译：柔性光提取结构的建模：有机发光二极管的提高灵活性和光学效率

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摘要

Organic light-emitting diodes (OLEDs) have recently garnered significant attention due to their excellent performance. Despite intensive research efforts, OLEDs still face the challenges of low external quantum efficiency (EQE) and instability when applied to flexible displays. Herein, we developed a periodic flexible nano-grating structure (FNG) through laser interference lithography (LIL). Enhanced flexibility through the introduction of the FNG structure was modeled based on beam theory in terms of structure parameters and represented as the relative bending deflection. In addition, the structure parameters, period and thickness of the FNG structure were simultaneously optimized by computational finite-difference time-domain (FDTD) methods. The FNG structure not only enhanced the optical efficiencies of the device, but also reduced the stress of the flexible devices. Consequently, when the FNG with the largest relative bending deflection of 2.29 was applied to the OLED device, the external quantum efficiency (EQE) were higher as 2.80% compared to that of reference as 2.08%. After cyclic bending, the difference in EQE was more increased due to reduced relative bending stiffness, where the EQE of the FNG integrated device was 2.49% and that of the reference device was 0.91%.
机译：有机发光二极管（OLED）由于其出色的性能而言，最近获得了显着的关注。尽管采取了集约化的研究，但OLED仍然面临低外部量子效率（EQE）和应用于柔性显示器时的挑战。这里，我们通过激光干扰光刻（LIL）开发了一种周期性的柔性纳米光栅结构（FNG）。通过在结构参数方面基于光束理论建模FNG结构的增强灵活性，并表示为相对弯曲偏转。另外，通过计算有限差差时域（FDTD）方法同时优化FNG结构的结构参数，周期和厚度。 FNG结构不仅提高了器件的光学效率，而且还降低了柔性装置的应力。因此，当对OLED器件施加具有2.29的最大相对弯曲偏转的FNG时，与参考值相比，外部量子效率（EQE）较高至2.80％，如2.08％。在循环弯曲之后，由于相对弯曲刚度降低，EQE的差异更大，其中FNG集成装置的EQE为2.49％，参考装置的EQE为0.91％。

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  • 来源
    《Organic Electronics》 |2020年第10期|105760.1-105760.9|共9页
  • 作者

    Jae Geun Kim; Ju Sung Lee; Ha Hwang; Enjung Kim; Younguk Choi; Jin Ho Kwak; Soo Jong Park; Yooji Hwang; Kwang Wook Choi; Young Wook Park; Byeong-Kwon Ju;

  • 作者单位

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea Samsung Display Co. Samsung Street 181 Tangjeong-Myeon Asan-si Chungcheongnam-do 31460 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

    School of Mechanical and ICT Convergence Engineering Sun Moon University Choongcheongnamdo 31460 Republic of Korea;

    Display and Nanosystem Laboratory Department of Electrical Engineering Korea University Seoul 02841 Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    Flexible organic light-emitting diodes (OLEDs); Modeling of bending stiffness; FDTD simulation; Light extraction;

    机译：柔性有机发光二极管（OLED）;弯曲刚度的建模;FDTD模拟;轻萃取;

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