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標題: | 二維光子晶體發光二極體結合量子點材料之光通訊系統分析 Two-dimensional Photonic Crystal Light-emitting Diodes Combined with Quantum Dots for Visible Light Communication System Analysis |
作者: | Wen-Hao Chiang 蔣文皓 |
指導教授: | 黃建璋(Jian-Jang Huang) |
關鍵字: | 發光二極體,可見光通訊,光子晶體,頻率響應,量子點,螢光共振能量轉移, light-emitting diode,visible light communication,photoinc crystals,electro-optical frequency response,colloidal quantum dot,Förster resonance energy transfer, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 可見光通訊系統近來年逐漸興起,逐漸應用在我們的日常生活中,無線通訊結合一般照明系統,使得這樣的組合成為具有潛力的通訊系統。對於無線通訊的需求漸漸增加,元件操作速率的提升也成為重要的目標。藍光發光二極體(LED)仍是目前最主要的發光源,同時也作為白色發光元件的發光源之一,但其較長的自發性輻射複合生命週期影響整體調變頻寬,因此除了提升LED操作速率外,結合量子點探討元件反應速率為本論文主要目標。 一般而言,縮小LED元件尺寸,雖然可提升元件的頻寬,但也減少了整體發光面積與強度。本論文將藍光LED結合二維光子晶體結構,透過此結構提升頻寬,針對開關鍵控調變的方式下,以178 MHz的調變頻寬,成功達到資料傳輸率400 Mbps,因此在我們的實驗下證實,利用氮化鎵系之藍光LED作為發光元件,並加入二微光子晶體結構,可成功提升元件的調變頻寬。 LED結合多樣的顏色轉換技術已被廣泛的使用在可見光通訊,但量子點參雜在奈米洞內的電光頻率響應卻很少討論。此篇文章我們提出LED結合光子晶體結構和綠光的量子點用於研究頻率響應。當考慮到整體藍光與綠光混和後的輸出信號時,我們觀察到具有量子點的光子晶體LED,其調變質量優於具有量子點的傳統LED。然而,當只有量子點所轉換綠光的頻率響應則顯示出矛盾的結果。較慢的電光轉換響應歸因於在光子晶體LED上的量子點的輻射和非輻射能量轉移過程產生更多的路徑來轉換至綠色量子點發光。 Visible light communication technologies have steadily arisen in recent years and are gradually being used in our daily lives. The combination of wireless communication and general lighting systems could be used as a communication system. Blue light-emitting diodes (LEDs) continue to be the most significant light-emitting sources, and they are also one of the light-emitting sources of white light-emitting components, although their long spontaneous radiation recombination lifetime limits the total modulation bandwidth. As a result, in addition to increasing the operating speed of LEDs, the major purpose of this thesis is to explore the device's E-O (electro-optical) response when combined with quantum dots. In general, shrinking the size of an LED mesa may enhance its bandwidth while simultaneously decreasing its total light-emitting area and intensity. In our study, a two-dimensional photonic crystal (PhC) structure is embedded in the blue LEDs (PhCLEDs), which improves the optical bandwidth. With on-off keying modulation and a modulation bandwidth of 178 MHz, a data transmission rate of 400 Mbps is successfully achieved. In our experiments, it has been shown that the modulation bandwidth of the elements can be successfully increased by using GaN-based blue LEDs with a two-dimension photonic crystal structure. Though light-emitting diodes (LEDs) combined with various color conversion techniques have been widely explored for VLC (visible light communication), E-O (electro-optical) frequency responses of devices with quantum dots (QDs) embedded within the nanoholes have rarely addressed. Here we propose LEDs with embedded photonic crystal (PhC) nanohole patterns and green light QDs for studying E-O frequency bandwidths. We observe the E-O modulation quality of PhC LEDs with QDs is better than a conventional LED with QDs when the overall blue mixed with green light output signal is considered. However, the optical response of only QD converted green light shows a contradictory result. The slower E-O conversion response is attributed to multi-path green light generation from both radiative and nonradiative energy transfer processes for QDs coated on the PhC LEDs. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/86028 |
DOI: | 10.6342/NTU202203476 |
全文授權: | 同意授權(全球公開) |
電子全文公開日期: | 2022-09-26 |
顯示於系所單位: | 光電工程學研究所 |
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U0001-1609202215511900.pdf | 2.69 MB | Adobe PDF | 檢視/開啟 |
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