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標題: | 以高扭曲結構為核心之電洞傳輸材料設計、合成與元件的應用 Design, Synthesis and Application of Highly-Twisted Hole Transporting Materials |
作者: | Yi-Sheng Chen 陳以昇 |
指導教授: | 汪根欉(Ken-Tsung Wong) 汪根欉(Ken-Tsung Wong | kenwong@ntu.edu.tw | ), |
關鍵字: | 激發複合物, Eexciplex, |
出版年 : | 2022 |
學位: | 博士 |
摘要: | 近年來有機發光二極體的研究蓬勃發展,從生動的影像顯示色彩至近紅外光的影像探測,都展現了有機發光二極體的無限潛能。本論文將具有高立體障礙的官能基引入分子設計當中,合成出一系列具有高扭曲結構的電洞傳輸材料,透過與相對應的電子傳輸材料結合,形成一系列具有熱激延遲螢光性質的激發錯合物,並應用於有機發光二極體的放光層當中,嘗試製作高效率的有機發光元件。 第一章的部分,簡述了有機發光二極體的歷史、基本的光物理介紹,以及具延遲螢光性質的有機發光二極體材料之設計方向以及需求。第二章的部分,以具高立體障礙的旋環雙芴的結構作為核心,引入不同推電子能力以及不同大小的電子予體,發展出一系列的電洞傳輸材料,並結合適當的電子傳輸材料組成激發錯合物,進行其後續的光物理探討以及發光元件之應用。第三章則是以具高度扭曲結構的六苯基苯作為發想,引入不同推電子能力的電子予體,使其成為具高三重態能階的電洞傳輸材料,並結合適當的電子傳輸材料組成激發錯合物,進行其後續的光物理探討以及發光元件之應用。最後,第四章的部分則是在推電子基-拉電子基的架構下 (即 Donor-Acceptor 架構),在電子受體端引入氟原子,形成具有三重態能階的 D-A 架構電洞傳輸材料,並藉由篩選適當的電子傳輸材料搭配形成激發錯合物,以利於進一步探討引入氟原子的電洞傳輸材料,對於激發錯合物的形成與光物理行為之影響。 In recent year organic light emitting diodes (OLEDs) have received fascinating attention as one of the promising technologies for display. Nowadays, the OLED-based application not only affords great success for thin flat-panel displays with vivid colors but also further attempts to develop near-infrared OLEDs for various applications like night-vision display, optical telecommunication, bioimaging, etc. In this thesis, a series of highly steric derivatives were designed as the hole-transporting materials (HTL) to probe the exciplex-forming systems and their characteristics. These new blends have been examined as the emitting layer of the OLED device. In the first chapter, a brief introduction of the OLED development and working principle. In the secondary chapter, a series of spirobifluorene-centered derivatives were designed by introducing the different electron-donating groups with different degrees of steric effect. These new materials were combined with various electron-transporting materials (ETL) for examining the exciplex formation and their application in OLED devices fabrication. In the third chapter, the hexaphenylbenzene (HPB)-based molecules with different electron-donating groups were developed for exciplex-based OLEDs application. The highly-twisted structure of the HPB core leads to the higher triplet state, which is beneficial for giving high efficiency exciplex-based OLED device. In the last chapter, the Donor-Acceptor (D-A)-configured molecules containing the fluorine-substituted acceptor were synthesized for giving subtle intramolecular charge transfer that minimizes the singlet-triplet splitting. By screening the appropriate ETL to form exciplex, the structural influence of the F-modified D-A-configured HTL on exciplex formation and photophysical behavior were explored. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/83536 |
DOI: | 10.6342/NTU202202616 |
全文授權: | 未授權 |
顯示於系所單位: | 化學系 |
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