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介绍了几种利用复合技术提高光子晶体LED出光效率的方法。利用复合技术在LED上形成光子晶体结构和微腔结构、全方位反射镜、图形化衬底、AlGaN限制层或嵌入式光子晶体层复合的结构,可以改变LED的发光光路与内部导波模式分布,有效地提高光子晶体LED的发光效率。以五种复合结构为例进行分析,通过实验制备和时域有限差分(FDTD)模拟仿真,证实了与传统LED结构相比,经过适当优化参数配置,具有复合结构的LED比只具有表面光子晶体的LED结构出光效率有显著提高。
Several methods for improving the light extraction efficiency of photonic crystal LED using composite technology are introduced. Using composite technology to form a structure of photonic crystal structure and microcavity structure, omnidirectional mirror, patterned substrate, AlGaN confinement layer or embedded photonic crystal layer composite structure on the LED can change the light emitting light path and internal waveguide mode distribution , Effectively improve the photon crystal LED luminous efficiency. Taking the five kinds of composite structures as an example, the experimental simulation and time-domain finite difference (FDTD) simulation show that, compared with the traditional LED structure, with the optimized parameters, the LED with the composite structure has better optical performance than the surface photonic crystal The LED structure of the light efficiency has significantly improved.