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%.

由于有机发光二极管（OLED）的出色性能，近来引起了广泛的关注。尽管进行了深入的研究，但当应用于柔性显示器时，OLED仍然面临着外部量子效率（EQE）低和不稳定性的挑战。本文中，我们通过激光干涉光刻（LIL）开发了一种周期性柔性纳米光栅结构（FNG）。通过基于梁理论在结构参数方面对通过引入FNG结构而增强的灵活性进行了建模，并表示为相对弯曲挠度。另外，通过计算时域有限差分法（FDTD）同时优化了FNG结构的结构参数，周期和厚度。FNG结构不仅提高了设备​​的光学效率，而且还减轻了柔性设备的压力。因此，当将最大相对弯曲挠度为2.29的FNG应用于OLED器件时，外部量子效率（EQE）达到2.80％，而参考值则为2.08％。循环弯曲后，由于相对弯曲刚度降低，EQE的差异更大，其中FNG集成设备的EQE为2.49％，参考设备的EQE为0.91％。