利用复模式分析方法对LED光提取效率的研究

发布时间：2018-01-22 05:55

  本文关键词： 发光二极管 光提取效率 复模式匹配算法 一维光子晶体　出处：《山东大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着能源危机的愈发严峻,世界各国纷纷采取各种措施来积极应对。照明用电作为能源消耗中的一个重要组成部分,依然还有巨大的节能空间。半导体发光二极管(Light Emitting Diode,LED)具有光电转换效率高、响应速度快等诸多优点,进一步提高LED的发光效率极具研究价值。LED的内量子效率普遍已经达到80%以上,但受限于全反射作用,光提取效率较低,因此利用表面微结构、芯片倒装等技术提高LED光提取效率成为了目前研究的热点。通过计算机对不同结构下的LED进行仿真模拟是研究LED光提取效率的主要手段,主要的电磁场数值仿真算法包括:有限元法、时域有限差分法、光束传播法、矩量法等。受限于计算机硬件水平,目前LED仿真模拟尚无法实现对LED模型进行全尺寸和高精度仿真模拟,因此探索和验证新的理论方法有助于明晰纳米结构提高LED光提取效率的物理过程和机理,提高LED的仿真模拟效率。本论文的主要研究内容包括:(1)在圣巴巴拉分校(University of California Santa Barbara,UCSB)的 A.David 的工作基础上,本论文首次提出利用复模式理论对纳米结构LED中的辐射模进行定量分析,进而深入研究纳米结构提高LED光提取效率的物理机制。(2)开发了纳米结构LED专用的复模式匹配算法,利用复模式匹配方法对纳米结构LED等效波导进行了仿真模拟,并与FDTD结果进行了对比验证。在同等尺寸和仿真精度的情况下,复模式匹配算法比FDTD算法速度有了极大提高,同时纳米结构调控模式的物理过程更加清晰。(3)利用复模式匹配算法对一维光子晶体LED进行了建模和仿真,得到了光子晶体周期、占空比、高度对LED中导模和辐射模的调控规律,并对一维光子晶体LED的结构参数进行了优化,使光提取效率提高了 111.2%。
[Abstract]:With the increasingly severe energy crisis, countries around the world have taken a variety of measures to actively deal with the lighting as an important part of energy consumption. The semiconductor light-emitting diode (LED) has many advantages, such as high photoelectric conversion efficiency, high response speed and so on. Further improving the luminescence efficiency of LED is of great value. The internal quantum efficiency of LED has generally reached more than 80%, but limited by the total reflection, the light extraction efficiency is low, so the surface microstructure is used. Chip inversion and other technologies to improve the efficiency of LED optical extraction has become a hot topic. Simulation of LED with different structures is the main method to study the efficiency of LED optical extraction. The main numerical simulation algorithms of electromagnetic field include finite element method, finite difference time-domain method, beam propagation method, moment method and so on. At present, LED simulation can not realize full-scale and high-precision simulation of LED model. Therefore, exploring and validating new theoretical methods can help to clarify the physical process and mechanism of nano-structure to improve the efficiency of LED optical extraction. To improve the efficiency of LED simulation. The main contents of this thesis include: 1) at Santa Barbara (. University of California Santa Barbara. Based on the work of A. David of UCSB, the complex mode theory is proposed for the quantitative analysis of radiation modes in nanostructure LED for the first time. Furthermore, the physical mechanism of improving the optical extraction efficiency of LED by nanostructures is studied. (2) A complex pattern matching algorithm for nano-structure LED is developed. The LED equivalent waveguide of nanostructure is simulated by complex mode matching method, and compared with the results of FDTD. Under the condition of the same size and simulation precision. The speed of complex pattern matching algorithm is much faster than that of FDTD algorithm. At the same time, the physical process of the modulation mode of nanostructure is clearer. (3) the one-dimensional photonic crystal LED is modeled and simulated using complex mode matching algorithm, and the cycle and duty cycle of the photonic crystal are obtained. The height regulates the guiding mode and radiation mode in LED, and the structure parameters of one-dimensional photonic crystal LED are optimized. The light extraction efficiency is improved by 111.2%.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN312.8

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