设计了一种新型的具有较高光提取效率的双光栅结构的发光二极管,它在传统光栅发光二极管的有源层的下表面增加了光栅结构,提取出原本受限于全反射的光,获得了更高的光提取效率。利用三维严格耦合波理论对该结构的光学性能进行了分析,计算结果表明,这种新型的双光栅结构发光二极管的提取效率可达传统平板型的6.3倍。 A novel light-emitting diode with double grating structure with high light extraction efficiency is designed, which adds a grating structure on the lower surface of the active layer of a conventional light-emitting diode and extracts the light originally limited by total reflection to obtain Higher light extraction efficiency. The optical properties of the structure were analyzed by using the three-dimensional rigorous coupled-wave theory. The calculation results show that the new double-grating LED can be extracted by 6.3 times the traditional flat-plate type.