發(fā)布時間：2018-01-22 05:55

  本文關鍵詞： 發(fā)光二極管 光提取效率 復模式匹配算法 一維光子晶體　出處：《山東大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著能源危機的愈發(fā)嚴峻,世界各國紛紛采取各種措施來積極應對。照明用電作為能源消耗中的一個重要組成部分,依然還有巨大的節(jié)能空間。半導體發(fā)光二極管(Light Emitting Diode,LED)具有光電轉(zhuǎn)換效率高、響應速度快等諸多優(yōu)點,進一步提高LED的發(fā)光效率極具研究價值。LED的內(nèi)量子效率普遍已經(jīng)達到80%以上,但受限于全反射作用,光提取效率較低,因此利用表面微結構、芯片倒裝等技術提高LED光提取效率成為了目前研究的熱點。通過計算機對不同結構下的LED進行仿真模擬是研究LED光提取效率的主要手段,主要的電磁場數(shù)值仿真算法包括:有限元法、時域有限差分法、光束傳播法、矩量法等。受限于計算機硬件水平,目前LED仿真模擬尚無法實現(xiàn)對LED模型進行全尺寸和高精度仿真模擬,因此探索和驗證新的理論方法有助于明晰納米結構提高LED光提取效率的物理過程和機理,提高LED的仿真模擬效率。本論文的主要研究內(nèi)容包括:(1)在圣巴巴拉分校(University of California Santa Barbara,UCSB)的 A.David 的工作基礎上,本論文首次提出利用復模式理論對納米結構LED中的輻射模進行定量分析,進而深入研究納米結構提高LED光提取效率的物理機制。(2)開發(fā)了納米結構LED專用的復模式匹配算法,利用復模式匹配方法對納米結構LED等效波導進行了仿真模擬,并與FDTD結果進行了對比驗證。在同等尺寸和仿真精度的情況下,復模式匹配算法比FDTD算法速度有了極大提高,同時納米結構調(diào)控模式的物理過程更加清晰。(3)利用復模式匹配算法對一維光子晶體LED進行了建模和仿真,得到了光子晶體周期、占空比、高度對LED中導模和輻射模的調(diào)控規(guī)律,并對一維光子晶體LED的結構參數(shù)進行了優(yōu)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%.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN312.8

【參考文獻】

中國期刊全文數(shù)據(jù)庫 前3條

1 張學勤;;能源經(jīng)濟形勢與機遇、挑戰(zhàn)[J];時代金融;2015年14期

2 鄭彥;;大功率LED散熱技術的研究[J];科技資訊;2013年29期

3 熊偉平;范廣涵;李琦;;提高LED光提取效率的研究[J];光子學報;2010年11期

中國博士學位論文全文數(shù)據(jù)庫 前1條

1 劉會;利用光子晶體與一維光柵結構提高GaN基LED光取出效率的研究[D];華中科技大學;2014年

中國碩士學位論文全文數(shù)據(jù)庫 前3條

1 向本才;高壓集成AC/DC LED驅(qū)動IC設計[D];電子科技大學;2015年

2 李偉;表面微結構對GaN基LED光提取效率提高的研究[D];山東大學;2014年

3 郝海濤;白光LED用熒光材料的制備及性能研究[D];太原理工大學;2006年

，

本文編號：1453877