博碩士論文 100226042 詳細資訊




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姓名 陳柏廷(Po-Ting Chen)  查詢紙本館藏   畢業系所 光電科學與工程學系
論文名稱 有機波導結構的ASE現象研究以及共振腔結構的模擬
(Studies of ASE Phenomenon in Organic Waveguide Structure and Resonator Structure Simulation)
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摘要(中) 本論文主要是利用一般有機發光二極體的元件架構,研究多層波導結構下有機材料的ASE現象。主要的方法是在ITO透明導電電極與有機發光層(BSB-Cz)中間插入空間層,來解決ITO電極所產生的光學損耗。實驗發現插入較BSB-Cz折射率低的有機高分子電洞傳輸層PVK並優化其厚度,可將ASE的閥值能量降到與直接鍍製BSB-Cz於玻璃基板上一樣的等級,約0.78 uJ/pulse。主要原因為PVK插入後可以改善波導模態的光場分布,減少在ITO電極的光學損耗。然而,插入高折射率的電子傳輸層TiO2則無法看到明顯的ASE現象。原因可能為TiO2折射率過高,光子容易被侷限在TiO2這層裡面,減少了光子在有機發光層裡的光放大機制。最後也模擬了一維DFB共振腔結構,找出適當的週期使共振波長吻合發光材料增益最大的波長位置,並且能運用在有電極的多層波導結構。此研究可有助於之後對電激發有機雷射的開發。
摘要(英) In this paper, we study ASE phenomenon of organic materials in a multilayer waveguide structure based on the general OLED device configuration. The method is to insert a spacer between the transparent electrode (ITO) and the organic emitting layer (BSB-Cz) to reduce the optical losses introduced by the ITO electrode. In the experiments, we observe that by inserting an organic polymer hole transport layer (PVK) with the refractive index lower than BSB-Cz and the thickness optimized, the ASE threshold energy can be reduced down to about 0.78 uJ/pulse, similar to as when BSB-Cz is directly deposited on the glass substrate. The main reason is that insertion of PVK can restore the waveguide mode profile and reduce the optical losses in ITO layer. However, we didn’t observe the ASE obviously when inserting the electron transport layer (TiO2) with a higher refractive index than BSB-Cz. The reason is that the high refractive index of TiO2 results in the photons essentially confined in the TiO2 layer, and hence decreasing the photon light amplification mechanism in the organic emitting layer. Finally, we simulate one dimension DFB resonator, to find out the suitable period such that the resonant wavelength can match the peak gain wavelength of organic materials. This study can be applied to multilayer waveguide structure, and the future development of electrically pumped organic lasers.
關鍵字(中) ★ 有機
★ ASE現象
★ 波導結構
★ DFB共振腔
關鍵字(英) ★ organic
★ ASE effect
★ waveguide structure
★ DFB resonator
論文目次 摘要 -------------------------------------------------- I
Abstract --------------------------------------------- II
致謝 ------------------------------------------------ III
目錄 ------------------------------------------------- IV
圖目錄 ----------------------------------------------- VI
表目錄 ------------------------------------------------ X
第一章 緒論 ---------------------------------------- 1
1.1 有機半導體簡介 ------------------------------ 1
1.2 有機雷射發展與難題 -------------------------- 2
1.3 研究動機與目的 ------------------------------ 5
第二章 基本原理 ------------------------------------ 6
2.1 有機雷射原理 -------------------------------- 6
2.1.1 有機發光材料 ---------------------------- 6
2.1.2 發光機制 ------------------------------- 11
2.1.3 增益特性 ------------------------------- 15
2.1.4 共振腔 --------------------------------- 21
2.2 三層平板波導之模態計算 --------------------- 26
2.3 傳遞矩陣法解多層波導之模態 ----------------- 35
第三章 研究方法 ----------------------------------- 41
3.1 元件結構介紹與製備 ------------------------- 41
3.2 量測儀器 ----------------------------------- 45
3.3 實驗量測架構 ------------------------------- 49
3.4 雙光束干涉製作光柵結構 --------------------- 51
第四章 實驗結果與討論 ----------------------------- 54
4.1 有機材料光學特性 --------------------------- 54
4.2 多層波導結構之ASE量測 ---------------------- 63
4.3 共振腔結構模擬 ----------------------------- 75
第五章 總結與未來展望 ----------------------------- 88
參考文獻 -------------------------------------------- 90
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指導教授 張瑞芬、李正中
(Jui-Fen Chang、Cheng-Chung Lee)
審核日期 2013-8-27
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