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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 吳忠幟(Chung-Chih Wu) | |
dc.contributor.author | Bo-Kai Wang | en |
dc.contributor.author | 王柏凱 | zh_TW |
dc.date.accessioned | 2021-06-17T09:09:15Z | - |
dc.date.available | 2026-02-02 | |
dc.date.copyright | 2021-02-22 | |
dc.date.issued | 2021 | |
dc.date.submitted | 2021-02-02 | |
dc.identifier.citation | [1] H. Uoyama, K. Goushi, K. Shizu, H. Nomura, and C. Adachi, Highly efficient organic light-emitting diodes from delayed fluorescence. Nature, 492, 234-238 (2012). [2] M. A. Baldo, D. F. O'Brien, Y. You, A. Shoustikov, S. Sibley, M. E. Thompson, and S. R. Forrest, Highly efficient phosphorescent emission from organic electroluminescent devices. Nature, 395, 151-154 (1998). [3] W.-K. Lee, Y.-H. Huang, K.-C. Pan, T.-A. Lin, T. Chatterjee, K.-T. Wong, and C.-C. Wu, Quantitative analyses of high electroluminescence efficiency of thermally activated delayed fluorescence emitters based on acridine–triazine hybrids. Journal of Photonics for Energy, 8, 032105 (2018). [4] P. E. Burrows, A. B. Padmaperuma, L. S. Sapochak, P. Djurovich, and M. E. Thompson, Ultraviolet electroluminescence and blue-green phosphorescence using an organic diphosphine oxide charge transporting layer. Applied Physics Letters, 88 183503 (2006). [5] S. Moller and S. R. Forrest, Improved light out-coupling in organic light emitting diodes employing ordered microlens arrays. Journal of Applied Physics, 91, 3324-3327 (2002). [6] G. Gu, D. Z. Garbuzov, P. E. Burrows, S. Venkatesh, S. R. Forrest, and M. E. Thompson, High-external-quantum-efficiency organic light-emitting devices. Optics Letters, 22, 396-398 (1997). [7] Y. Qu, J. Kim, C. Coburn, and S. R. Forrest, Efficient, Nonintrusive Outcoupling in Organic Light Emitting Devices Using Embedded Microlens Arrays. ACS Photonics, 5, 2453-2458 (2018). [8] S. Jeon, S. Lee, K. H. Han, H. Shin, K. H. Kim, J. H. Jeong, and J. J. Kim, High-Quality White OLEDs with Comparable Efficiencies to LEDs. Advanced Optical Materials, 6, 1701349 (2018). [9] C. Y. Lu, M. Jiao, W. K. Lee, C. Y. Chen, W. L. Tsai, C. Y. Lin, and C. C. Wu, Achieving Above 60% External Quantum Efficiency in Organic Light-Emitting Devices Using ITO-Free Low-Index Transparent Electrode and Emitters with Preferential Horizontal Emitting Dipoles. Advanced Functional Materials, 26, 3250-3258 (2016). [10] M. Jiao, C. Y. Lu, W. K. Lee, C. Y. Chen, and C. C. Wu, Simple Planar Indium-Tin-Oxide-Free Organic Light-Emitting Devices with Nearly 39% External Quantum Efficiency. Advanced Optical Materials, 4, 365-370 (2016). [11] W. Youn, J. Lee, M. F. Xu, R. Singh, and F. So, Corrugated Sapphire Substrates for Organic Light-Emitting Diode Light Extraction. ACS applied materials interfaces, 7, 8974-8978 (2015). [12] Y. H. Huang, W. L. Tsai, W. K. Lee, M. Jiao, C. Y. Lu, C. Y. Lin, C. Y. Chen, and C. C. Wu, Unlocking the Full Potential of Conducting Polymers for High-Effi ciency Organic Light-Emitting Devices. Advanced Materials, 27, 929-934 (2015). [13] W. H. Koo, S. M. Jeong, F. Araoka, K. Ishikawa, S. Nishimura, T. Toyooka, and H. Takezoe, Light extraction from organic light-emitting diodes enhanced by spontaneously formed buckles. Nature Photonics, 4, 222-226 (2010). [14] Y. Sun and S. R. Forrest, Enhanced light out-coupling of organic light-emitting devices using embedded low-index grids. Nature Photonics, 2, 483-487 (2008). [15] J. J. Shiang, T. J. Faircloth, and A. R. Duggal, Experimental demonstration of increased organic light emitting device output via volumetric light scattering. Journal of Applied Physics, 95, 2889-2895 (2004). [16] Y. J. Lee, S. H. Kim, J. Huh, G. H. Kim, Y. H. Lee, S. H. Cho, Y. C. Kim, and Y. R. Do, A high-extraction-efficiency nanopatterned organic light-emitting diode. Applied Physics Letters, 82, 3779-3781 (2003). [17] E. Kim, H. Cho, K. Kim, T. W. Koh, J. Chung, J. Lee, Y. Park, and S. Yoo, A Facile Route to Efficient, Low-Cost Flexible Organic Light-Emitting Diodes: Utilizing the High Refractive Index and Built-In Scattering Properties of Industrial-Grade PEN Substrates. Advanced Materials, 27, 1624-1631 (2015). [18] S. Reineke, F. Lindner, G. Schwartz, N. Seidler, K. Walzer, B. Luessem, and K. Leo, White organic light-emitting diodes with fluorescent tube efficiency. Nature, 459, 234-238 (2009). [19] S. Mladenovski, K. Neyts, D. Pavicic, A. Werner, and C. Rothe, Exceptionally efficient organic light emitting devices using high refractive index substrates. Optics Express, 17, 7562-7570 (2009). [20] C. Mayr, S. Y. Lee, T. D. Schmidt, T. Yasuda, C. Adachi, and W. Brutting, Efficiency Enhancement of Organic Light-Emitting Diodes Incorporating a Highly Oriented Thermally Activated Delayed Fluorescence Emitter. Advanced Functional Materials, 24, 5232-5239 (2014). [21] P. Liehm, C. Murawski, M. Furno, B. Lussem, K. Leo, and M. C. Gather, Comparing the emissive dipole orientation of two similar phosphorescent green emitter molecules in highly efficient organic light-emitting diodes. Applied Physics Letters, 101, 253304 (2012). [22] W. X. Zeng, H. Y. Lai, W. K. Lee, M. Jiao, Y. J. Shiu, C. Zhong, S. L. Gong, T. Zhou, G. Xie, M. Sarma, K. T. Wong, C. C. Wu, and C. Yang, Achieving Nearly 30% External Quantum Efficiency for Orange-Red Organic Light Emitting Diodes by Employing Thermally Activated Delayed Fluorescence Emitters Composed of 1,8-Naphthalimide-Acridine Hybrids. Advanced Materials, 30, 1704961 (2018). [23] K. C. Tien, M. S. Lin, Y. H. Lin, C. H. Tsai, M. H. Shiu, M. C. Wei, H. C. Cheng, C. L. Lin, H. W. Lin, and C. C. Wu, Utilizing surface plasmon polariton mediated energy transfer for tunable double-emitting organic light-emitting devices. Organic Electronics, 11, 397-406 (2010). [24] C. L. Lin, T. Y. Cho, C. H. Chang, and C. C. Wu, Enhancing light outcoupling of organic light-emitting devices by locating emitters around the second antinode of the reflective metal electrode. Applied Physics Letters, 88, 081114 (2006). [25] C. L. Lin, H. W. Lin, and C. C. Wu, Examining microcavity organic light-emitting devices having two metal mirrors. Applied Physics Letters, 87, 021101 (2005). [26] K. A. Neyts, Simulation of light emission from thin-film microcavities. Journal of the Optical Society of America A, 15, 962-971 (1998). [27] J. E. Sipe, The dipole antenna problem in surface physics: a new approach. Surface Science, 105, 489-504 (1981). [28] W. Lukosz and R. E. Kunz, Light emission by magnetic and electric dipoles close to a plane interface. I. Total radiated power. Journal of the Optical Society of America, 67, 1607-1615 (1977). [29] M. Liu, R. Komatsu, X. Y. Cai, K. Hotta, S. Sato, K. K. Liu, D. C. Chen, Y. Kato, H. Sasabe, S. Ohisa, Y. Suzuri, D. Yokoyama, S. J. Su, and J. Kido, Horizontally Orientated Sticklike Emitters: Enhancement of Intrinsic Out-Coupling Factor and Electroluminescence Performance. Chemistry of Materials, 29, 8630-8636 (2017). [30] Y.-H. Huang, K.-C. Lin, X. Zeng, M. Sarma, F. Ni, Y.-J. Shiu, W.-K. Lee, C.-J. Hsu, S.-W. Wen, and K.-T. Wong, High-efficiency organic light emitting diodes using high-index transparent electrode. Organic Electronics, 87, 105984 (2020). [31] J. D. Jackson, Classical Electrodynamics - Third Edition, Ch6, 265, John Wiley Sons., Inc. (1999). | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74871 | - |
dc.description.abstract | 隨著有機發光二極體之發展,目前已被視為重要的顯示及照明技術,而目前發展的主要目標著重於兩大方向,第一是開發新材料,透過提升發光效率或載子傳輸特性,來使元件的效率得到提升,就現今的OLED而言,在許多研究學者的努力下,材料面已有重大之突破。目前已有內部量子效率達接近100%之熱激活化延遲螢光材料以及磷光系統的出現。第二則是提升光萃取技術,如何將更多的光從有機發光二極體之中萃取出來是一個很重要的課題。 儘管高折射率基板和水平偶極矩發光材料均已被證實可以用於增強有機發光元件的光萃取效率,但它們的組合對有機發光元件之光學耦合效率的好處及潛力尚未充分的被研究。在本論文第一部份研究中,模擬結果指出,同時使用高折射率基板(折射率> 1.8-1.9)和高水平偶極矩發光材料(水平偶極矩比例> 85%),並一起搭配上低折射率或折射率匹配的載子傳輸層,並優化各有機層和透明電極的厚度,可以達到非常高的光耦合出光效率約90%(即有機發光元件外部量子效率約90%)。運用這些適當的元件設計條件,可以有效地抑制元件中所有的波導模態和大部分表面電漿模態,以達到最佳化的光輸出耦合效率。在元件實驗中,結合高折射率n〜1.78的藍寶石基板以及最新開發的有機發光元件之放光材料,其水平偶極矩比例高達87%,搭配上簡單的外部光萃取透鏡,成功實現了外部量子效率超過80%的有機發光元件 。 此外,近年來已經有許多透明有機發光元件及其可能應用之報導,例如透明顯示器、透明照明面板、頭戴式顯示器、智能窗戶等,因此,透明有機發光元件之出光效率以及穿透度是研究所關注之議題。本論文研究的第二部份中,運用高折射率摻鈮之二氧化鈦(TNO)透明電極(折射率約為2.4)與高水平偶極矩發光材料(水平偶極比率為87%)之組合,增強透明有機發光元件之微共振腔效應與有效地抑制侷限模態,進而顯著提高透明有機發光元件的整體出光耦合效率,達到不利用外部出光結構即可具有33.5%之總外部量子效率且峰值穿透率高達73%。除此之外,藉由調整元件厚度來達到不同穿透反射頻譜的峰值位置,使元件在未點亮前,因不同結構下呈現不同的顏色變化,使得透明元件更具有特色,也具有更多有趣的應用,例如彩色教堂和車用抗藍光擋風玻璃顯示器或照明面板等。 | zh_TW |
dc.description.abstract | With the development of organic light-emitting diodes (OLEDs), it has been regarded as an important display and lighting technology. The main goals of the current development focus on two major directions. The first is the development of new materials, that can improve efficiency or carrier transport characteristics. With the efforts of many researchers, many high-performance materials have been developed. At present, thermally activated delayed fluorescent materials and phosphorescent materials giving internal quantum efficiency close to ideal 100% have been developed. The second is to improve the light extraction of OLEDs. How to extract more light from the organic light emitting diode to air is an important issue. Although both high-index substrates and horizontal-dipole emitters have been shown to be facile approaches for enhancing OLEDs light extraction, the full benefits and potential of their combination for OLEDs optical out-coupling have not been thoroughly studied and explored. In the first part of this thesis study, simulation studies indicate that very high optical coupling efficiency into substrates ϕsub (and perhaps similarly high OLEDs external quantum efficiencies) of ~90% can be possibly obtained with both high-index substrates (refractive index >1.8-1.9) and highly horizontal-dipole emitters (horizontal dipole ratio >85%), together with adoption of low-index or index-matching carrier transport layers and optimization of organic layer and transparent electrode thicknesses. With these judicious device design conditions, all waveguided modes and surface plasmon modes in devices can be effectively suppressed for optimal optical out-coupling. Finally, combining the sapphire substrate having high index of n~1.78, the recently developed OLEDs emitters having high horizontal emitting dipole ratio of up to 87%, and simple external extraction lens, OLEDs devices having external quantum efficiency of over 80% were successfully realized. In recent years, possible applications of transparent organic light-emitting devices (TOLEDs) have been proposed, such as transparent displays, transparent lighting panels, head-mounted displays, and smart windows etc. As such, the efficiency and transparency of TOLEDs have been extensively studied. In the second part of this thesis, with the adoption of the high-index transparent electrode and the highly horizontal dipole emitters in transparent organic light-emitting devices (TOLEDs), the guided modes can be efficiently suppressed. As a result, overall coupling efficiencies of TOLEDs can be significantly enhanced. By using blue thermally activated delayed fluorescence (TADF) emitters with a highly horizontal dipole ratio of 87% and high-index niobium-doped titanium oxide (TNO) transparent electrode (with refractive index of 2.4), TOLEDs achieving a high external quantum efficiency (EQE) of up to 33.5% and a high peak transmittance of up to 73% was demonstrated. Furthermore, we could also adjusted the thicknesses of carrier transport layers to realize color-tunable transmissive/reflective hues in the off-state of such TOLEDs may have some interesting applications, such as stained color windows for churches and stylish smart windows etc. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T09:09:15Z (GMT). No. of bitstreams: 1 U0001-0102202102305600.pdf: 5503544 bytes, checksum: 3f039f452bae5b39cd7680bceabacbdd (MD5) Previous issue date: 2021 | en |
dc.description.tableofcontents | 口試委員審定書 i 誌謝 ii 中文摘要 iv ABSTRACT vi CONTENTS viii LIST OF TABLES x LIST OF FIGURES xi Chapter 1 Introduction 1.1 Overview of Organic Light-Emitting Devices 1 1.2 Overview of Optics of Organic Light-Emitting Devices 3 1.3 Motivation and Organization of Thesis 5 Reference 6 Tables and Figures 10 Chapter 2 Realization of Exceeding 80% External Quantum Efficiency In Organic Light-Emitting Diodes Using High-Index Substrates and Highly Horizontal Emitters 2.1 Introduction 12 2.2 Methods 15 2.2.1 Optical Simulation 15 2.2.2 Photophysical and Optical Characterization 16 2.2.3 OLED Fabrication and Characterization 17 2.3 Optical Simulation and Design 19 2.4 OLED Device Results and Discussions 23 2.5 Summary 27 References 28 Tables and Figures 33 Chapter 3 Transparent Organic Light-Emitting Diodes Having Exceeding 30% External Quantum Efficiency and Tunable Transmissive/Reflective Hues 3.1 Introduction 46 3.2 Methods 48 3.2.1 Optical Simulation 48 3.2.2 Photophysical and Optical Characterization 49 3.2.3 Deposition and Characterizations of TNO Films 50 3.2.4 TOLEDs Fabrication and Characterization 51 3.3 Optical Simulation and Design 53 3.4 TOLEDs Device Results and Discussions 55 3.5 Summary 62 References 63 Tables and Figures 68 Chapter 4 Summary 4.1 Summary 86 | |
dc.language.iso | en | |
dc.title | 應用高折射率材料增進有機發光元件效率之研究 | zh_TW |
dc.title | Investigating Use of High Refractive Index Materials for Enhancing Efficiencies of Organic Light-Emitting Diodes | en |
dc.type | Thesis | |
dc.date.schoolyear | 109-1 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 陳俐吟(Li-Yin Chen),蔡志宏(Chih-Hung Tsai),林昶宇(Chang-Yu Lin),黃奕翔(Yi-Hsiang Huang) | |
dc.subject.keyword | 有機發光元件,透明有機發光元件,熱激活化延遲螢光,水平發光偶極矩,高折射率基板,高折射率透明電極,微共振腔, | zh_TW |
dc.subject.keyword | OLEDs,transparent OLEDs,thermally activated delayed fluorescence,horizontal emitting dipole,high-index substrate,high-index transparent electrode,microcavity, | en |
dc.relation.page | 87 | |
dc.identifier.doi | 10.6342/NTU202100308 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2021-02-02 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電子工程學研究所 | zh_TW |
顯示於系所單位: | 電子工程學研究所 |
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