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博碩士論文 etd-0620118-142307 詳細資訊
Title page for etd-0620118-142307
論文名稱
Title
以高分子摻雜提升藍光高分子有機發光二極體之效率及壽命研究
Improving efficiency and lifetime of blue polymer light-emitting diodes with polymer dopant system
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
2018-07-19
繳交日期
Date of Submission
2018-07-20
關鍵字
Keywords
摻雜、高分子有機發光二極體、電子傳輸、藍光聚芳香醚、能階、壽命、溶液製程
Polymer light-emitting diodes, Doping, Blue Poly(arylene ether)s, Energy level, Electron transport, Lifetime, Solution process
統計
Statistics
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中文摘要
本論文主要以本實驗室所合成出三種新型聚芳香醚藍光高分子,包含唑(Carbazole),蒽(Anthracene)、聯蒽(BiAnthracene)和芘(pyrene)的衍生物,成功應用於高分子有機發光二極體,透過高分子薄膜特性分析,包含材料的吸收、放光、熱穩定性以及能階,在三種材料CzAn、CzBAn、CzPy中以CzBAn具有良好的立體障礙性及熱穩定性T¬d5%高達500oC,而玻璃轉移溫度Tg為230oC,三種高分子材料皆具有良好藍光光色,其理論CIE座標的y軸小於0.15,高分子CzAn和CzBAn的相對量子效率皆大於標準品材料PFO。
三款材料的HOMO能階介於5.71eV至5.78eV之間,因材料本身的非共軛型態導致傳輸能力不佳,為了改善此問題,增加電子傳輸材料TPBi,因其具有較深之HOMO能階,同時兼具電洞阻擋效果,另一種方法是將有機發光層進行物理摻雜的方式,進而提升材料之導電特性,提高元件效率,且有效降低元件驅動電壓。
在此研究,所使用的摻雜藍光高分子有機發光二極體元件結構分別為ITO/ PEDOT:PSS/ CzBAn: PFO/ LiF/ Al及ITO/ PEDOT: PSS/ CzBAn: PVK/ LiF/ Al,分別得到最小驅動電壓4.5V最大亮度2030 cd/m2、最大電流效率 2.5 cd/A、外部量子效率1.4% 和最小驅動電壓6V最大亮度522 cd/m2、最大電流效率4.87 cd/A、外部量子效率2.89%,元件壽命方面,以CzBAn:PVK的摻雜作為發光層,具有最佳之元件壽命。
Abstract
In this thesis, Three new novel blue light Emitting poly(arylene ether)s containing carbazole、Anthracene、Bianthracene and Pyrene derivatives has been successfully for PLED application. Through the polymers thin film characteristic analyzed, including absorption, light emission, thermal stability, and energy levels. The obtained polymers have high steric hindrance and good thermal stabilities, such as Tg range from 221oC to 230¬oC, and Td5% range from 438oC to 500oC. All polymers have lower value in CIE coordinates y < 0.15. The relative quantum efficiency of polymers, CzAn and CzBAn, are better than the standard material PFO.
Due to the structure of the polymers with non-conjugated, the HOMO energy levels were ranged from 5.71eV to 5.78eV. Herein, these two methods had been improved this phenomenon, one method is adding the electron transport layer material TPBi and have hole-blocking layer effect because it HOMO energy level up to 6.3eV, and the other method is physically doping in organic light-emitting layer, thereby improving the conductive properties of the material, increasing the efficiency of device, and effectively reduce the turn on voltage.
The optimized PLED structure of ITO/ PEDOT: PSS/ CzBAn: PFO/ TPBi/ Al, exhibited the turn on voltage is 4.5V, the maximum luminance of 2030 cd/m2, current efficiency of 2.5 cd/A, EQE of 1.4%. The other optimized PLED structure of ITO/ PEDOT:PSS/ CzBAn: PVK/ TPBi/ Al, exhibited the turn on voltage is 6V, the Maximum luminance of 522 cd/m2, the current efficiency of 4.87 cd/A, EQE of 2.89%.
The lifetime of the PLED device of CzBAn: PVK as emitting layer had the best result.
目次 Table of Contents
論文審定書 i
中文摘要 ii
Abstract iii
目錄 iv
圖目錄 vii
表目錄 xi
第一章 序論 1
1.1 前言 1
1.2 有機發光二極體之發展 2
1.3 有機發光二極體原理 6
1.4 有機發光二極體能量轉移機制 8
1.4.1 輻射能量轉移 9
1.4.2 非輻射能量轉移 9
1.5 有機發光二極體OLED和PLED之比較 11
1.6 量子效率 12
1.7 濃度淬熄效應 13
1.8 元件基本光學特性 13
1.9 CIE座標 14
1.10 文獻回顧 16
1.11 研究動機 26
第二章 實驗儀器介紹與原理 27
2.1 製程儀器 27
2.1.1 超音波清洗機(Ultrasonic Cleaner) 27
2.1.2 旋轉塗佈機(Spin Coater) 28
2.1.3 磁式旋轉加熱盤(hot plate) 29
2.1.4 電子天秤 29
2.1.5 紫外光臭氧清洗機(UV Ozone) 30
2.1.6 三聯式手套箱系統(Glove Box) 31
2.1.7 蒸鍍機(Evaporator) 32
2.2 量測儀器 33
2.2.1 紫外-可見光光譜儀(UV-visible Spectrophotometer) 33
2.2.2 螢光光譜儀(Fluorescence Spectrophotometer) 34
2.2.3 光電子能譜分析儀(Photo-Electron Spectroscopy in Air,PESA) 35
2.2.4 表面輪廓儀(Surface profiler) 36
2.2.5 光電特性量測系統 37
2.2.6 元件壽命量測系統(Lifetime) 38
第三章 實驗 39
3.1實驗藥品 39
3.2實驗規劃 44
3.3元件製程 45
3.4元件封裝 48
第四章 結果與討論 49
4.1 CzAn、CzBAn、CzPy高分子有機發光二極體材料特性分析 49
4.1.1 吸光特性分析 49
4.1.2 放光特性分析 51
4.1.3 CzAn、CzBAn、CzPy 材料薄膜能階分析 52
4.2 CzAn、CzBAn、CzPy、PFO高分子有機發光二極體之基本元件 54
4.3 以TPBi應用於高分子有機發光二極體元件 59
4.4 以CzBAn與PFO不同比例摻雜 64
4.5 以CzBAn與PVK不同比例摻雜 68
4.6 元件壽命 72
4.6.1 參數設定 72
4.6.2 元件壽命量測 73
第五章 結論 76
參考文獻 77
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