一种提高OLED基底出光效率的亚波长光栅设计

为了提高OLED出光效率，在OLED基底表面设计了二维连续表面亚波长光栅。利用等高台阶逼近的方法近似连续表面光栅结构，并结合等效介质理论和薄膜光学原理，设计光栅参数:刻蚀深度0.29 μm，周期大小0.165 μm，底边直径与周期的比值等于1，可以实现宽光谱、广角度的高透射率。利用时域有限差分方法仿真计算了该光栅对OLED基底出光效率的影响，结果表明，出光效率最高可提高30%。

Design of sub-wavelength grating for improving efficiency of OLED substrate

A two-dimensional continuous surface sub-wavelength grating was designed on the organic light-emitting diode(OLED) substrate surface in order to improve the efficiency of OLED. The sub-wavelength grating with approximate continuous surface structure was design by the method of equal height step approximation, according to the theory of equivalent medium and the principle of thin film optics. The grating parameters were designed as follows: the etching depth is 0.29 μm, the period is 0.165 μm, the ratio of the bottom diameter to the period is equal to 1, which can effectively realize high transmittance of wide spectrum and wide angle. The effect of the grating on the light efficiency of the OLED substrate was simulated by the finite-difference time domain method, and the results show that the maximum light output efficiency of 30% can be increased.