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標題: | 含二苯并噻碸和氰基吡啶雙極性材料之合成與性質分析及其在有機發光二極體的應用 Syntheses and Properties of Dibenzothiophene-S,S-dioxide- and Cyanopyridine-Based Bipolar Materials for Organic Light Emitting Diodes. |
作者: | Yu-Yi Ho 何昱儀 |
指導教授: | 汪根欉(Ken-Tsung Wong) |
關鍵字: | 二苯并??,氰基?啶,有機發光二極體,熱激活化延遲螢光, Dibenzothiophene-S,S-dioxide,Cyanopyridine,Organic Light Emitting Diodes,thermally activated delayed fluorescence (TADF), |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | 在本論文中,我們致力於設計出具有非常小的單重激發態最低能階與三重激發態最低能階之間的能隙(ΔEST)之雙極性分子,因此激子(exciton)可以在環境提供的熱能幫助下(大約0.026 eV),發生自旋上轉換(spin up-conversion)並進行逆向系統間跨越(reverse intersystem crossing, RISC),從不發光的三重激發態能階回到單重態激發能階,放出熱激活化延遲螢光(TADF)。 論文第一部份,我們合成了一系列以二苯并噻碸為核心之雙極性分子,除了引 入不同給電子能力的電子予體,也探討電子予體在二苯并噻碸不同位置上的基本 性質。 論文第二部分以9,10-二氫-9,9-二甲基吖啶(9,9-dimethyl-9,10-dihydroacridine,DMAC)作為電子予體、氰基吡啶(Cyanopyridine)作為電子受體,希望藉由增強分子整體的電荷轉移(charge transfer)能力,達到降低ΔEST,並探討此系列材料之基本性質和元件應用。 We synthesized a series of bipolar organic electroluminescent materials with a small energy gap (ΔEST) between the singlet and triplet excited states, leading to efficient spin-up conversion. The reverse intersystem crossing (RISC) from non-radiative triplet state to radiative singlet state allow these materials to perform thermally activated delayed fluorescence (TADF). In theory, the electroluminescent device with TADF emitter can deliver 100 % internal quantum efficiency (IQE), leading to 20 % external quantum efficiency (EQE). Firstly, we have synthesized a series of bipolar molecules using dibenzothiophene-S,S-dioxide as the accepting core equipping with various donors moieties. We found that the nature of donor and their attaching position onto the dibenzothiophene-S,S-dioxide core govern the physical properties. Secondly, we increase the electron-donating/ electron-withdrawing abilities of donor/ acceptor moieties, respectively. The new molecular design increases charge transfer behavior, giving a lower ΔEST and thus efficient TADF was observed. These new materials show promising OLED characteristics and useful for future display application. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/17969 |
全文授權: | 未授權 |
顯示於系所單位: | 化學系 |
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檔案 | 大小 | 格式 | |
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ntu-104-1.pdf 目前未授權公開取用 | 8.03 MB | Adobe PDF |
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