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博碩士論文 etd-0627115-170132 詳細資訊
Title page for etd-0627115-170132
論文名稱
Title
雙芴環衍生物其聚集特性對於放光行為之影響與應用
Study of aggregation effects on spirobifluorene derivative emission and application
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
95
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2015-07-09
繳交日期
Date of Submission
2015-08-05
關鍵字
Keywords
白光OLED、雙芴環、寬光譜、笓基、聚集
OLED device, Aggregation, Broadband spectrum, Spirobifluorene, Pyrene
統計
Statistics
本論文已被瀏覽 5721 次,被下載 40
The thesis/dissertation has been browsed 5721 times, has been downloaded 40 times.
中文摘要
近年來小分子材料設計進步對於有機發光二極體的發展具有重大的貢獻,在共軛有機化合物中,笓基(Pyrene)具有較剛硬的平面性發光團,並具有較佳的螢光量子效率及高熱穩定性,搭配剛性結構較強之螺旋雙芴環(spirobifluorene)可有效提高材料熱穩定性。
本實驗室自行設計並合成新型雙芴環衍生物材料2,2',7,7'-tetra-(pyrene -1-yl)-9,9'-spirobifluorene (TPSBF),研究過程中發現此小分子材料具有寬光譜放光行為,展現有別於一般小分子材料之窄頻譜放光特性,其放光範圍幾乎涵蓋整個可見光光譜。根據初步研究結果推測此寬光譜現象是由於分子與分子間不同堆疊形態所造成;其白光光譜具有多重放光峰值,主峰分別在460 nm(分子自放光)、520 nm(分子與分子間聚集放光)及550 nm~650 nm(分子間無序堆疊放光),且經由調變蒸鍍製程,可分別得到藍光CIE(0.22,0.28)和黃光CIE(0.44,0.50)。
本研究將藉由不同純化及蒸鍍條件設計,並搭配基質輔助雷射脫附游離飛行質譜儀(MALDI-TOF)、X光繞射儀(X-ray Diffraction,XRD),原子力掃描探針顯微鏡(Atomic Force Microscopy,AFM)、螢光光譜儀(Photoluminescence)、熱重分析(Thermogravimetric Analysis,TGA)等儀器,進行TPSBF分子AIE(Aggregation- Induced Emission)現象,對於寬光譜行為之影響及研究。
最後本論文以TPSBF作為發光層製作OLED元件。其元件結構為ITO(170nm)/2T-NATA(15nm)/TPSBF(15nm)/Alq3(15nm)/LiF(0.8nm)/Al(200nm),並得到最大亮度為51040cd/m2,CIE座標(0.25,0.33),最大發光效率為7.18cd/A,最大功率效率2.62lm/w。
Abstract
Recently, “Pyrene” is a well-known substitutive group because the rigid structure and hole-injection ability of pyrene units can improve the thermal and electronic properties of blue OLED materials. The aromatic ring of pyrene not only improves the thermal and hole-injection ability of derivatives, but also provides high photoluminescence (PL) efficiency and high carrier mobility. Spirobifluorene core provide an extremely thermal stability because of its highly rigid molecular structure and stereo hindrance .
We developed small molecule structures with spiro-type molecules based on 9,9-spirobifluorene named TPSBF, the PL spectrum of TPSBF film prepared by vacuum deposition with different thickness, it appears broadband spectrum. According to preliminary research, we speculate that broadband spectrum phenomenon associated with chromogen aggregation.
In this study, we will design a series of control experiment have been performed to externally and internally modulate the TPSBF aggregation. The results were measured by matrix-assisted laser desorption inoization-time of flight mass spectrometry(MALDI-TOF), Thermogravimetric analysis(TGA), Atomic force microscopy(AFM), and Photoluminescence(PL).
The above analysis implies that the broadband spectrum process is responsible for the aggregation induce emission(AIE) phenomena.
Finally, we fabricated the organic white light emitting device with a structure of ITO(170nm)/2T-NATA(15nm)/TPSBF(15nm)/Alq3(15nm)/LiF(0.8nm)/Al(200nm).It exhibited a maximum luminance at 1063 mA/cm2 of 51040 cd/m2,the maximum current and power efficiency were 7.18 cd/A and 2.62 lm/W, respectively, and with good CIE coordinate of(0.25,0.33).
目次 Table of Contents
論文審定書 i
誌謝 ii
中文摘要 iii
Abstract iv
目錄 vi
圖目錄 ix
表目錄 xiii
第一章 緒論 1
1-1 前言 1
1-2 OLED發展與簡介 3
1-3 OLED之元件 6
1-4 OLED之材料介紹 8
1-4-1 電極材料 9
1-4-2 電洞注入材料 10
1-4-3 電洞傳輸材料 11
1-4-4 電子傳輸層 12
1-4-5 發光層 13
1-5 WOLED之元件 18
第二章 理論基礎 21
2-1 OLED發光原理 21
2-2 發光機制 24
2-2-1 螢光與磷光 24
2-2-2 Forster與Dexter能量轉移機制 26
2-2-3 材料共軛長度與發光波長 28
2-2-4 濃度淬息效應 28
2-2-5 OLED發光效率之定義 29
2-3 CIE色座標 31
第三章 研究動機與實驗製程 32
3-1 研究動機 32
3-2 實驗架構 36
3-3 儀器簡介 38
3-3-1 製程儀器 38
3-3-2 量測儀器介紹 42
3-4 本研究之元件製作與量測 50
3-4-1 元件製作 51
第四章 結果與討論 53
4-1 TPSBF純化製程探討 53
4-2 熱製程對TPSBF材料變化之影響 56
4-2-1 不同粉末態之材料鑑定 58
4-2-2 TPSBF不同形態之PL光譜分析 60
4-2-3 以PLE光譜探討TPSBF不同形態之放光機制 63
4-3 化學結晶法之聚集現象 67
4-4 利用蒸鍍製程的調變觀察TPSBF薄膜特性 71
4-4-1 不同製程條件之PL光譜圖 71
4-4-2 以AFM探討薄膜表面形態 72
4-5 白光OLED元件特性探討 74
第五章 結論 77
參考文獻 78
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