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含苯并咪唑二苯並呋喃磷光主體材料的開發 = Development of...

國立高雄大學應用化學系碩士班

含苯并咪唑二苯並呋喃磷光主體材料的開發 = Development of Benzimidazole-containing Dibenzofurans for Phosphorescent OLED

Record Type:	Language materials, printed : monographic
Paralel Title:	Development of Benzimidazole-containing Dibenzofurans for Phosphorescent OLED
Author:	張惟嘉,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	2015[民104]
Description:	120面圖，表 : 30公分;
Subject:	有機發光二極體
Subject:	PhOLED
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/75647716341827844153
Summary:	高效率、低驅動電壓的有機發光元件一直是現今顯示器以及固態照明設備所追求的目標,而利用高三重態能量及具有雙極子特性的有機材料作為磷光摻雜物的主體材料更是提高元件效率的重要關鍵技術。在本篇論文中,我們成功的利用高三重態能量的dibenzofuran做為電洞傳輸基團,以及利用 N-phenylbenzimidazole做為電子傳輸基團,組合設計出三個小分子雙極性磷光主體材料(DBFIm28、DBFIm46及DBFPhIm46)。為了瞭解這三個材料在磷光主體材料方面的應用潛力,我們利用了UV吸收光譜、螢光及磷光放射光譜來研究材料的光學特性,由材料光學性質可得知這三個材料在固態薄膜下的三重態能量最高可達2.52 eV,可作為綠色及紅色磷光元件的主體材料。在X-ray及分子模擬的解析中,我們也成功利用分子位向的選擇及取代基的立體效應造成分子結構的扭轉,減少材料在固態薄膜下的堆疊。本研究中也使用光電子光譜來量測材料的功函數,得知這些材料的HOMO能階介於-5.8 ~ -5.87 eV,LUMO能階介於-2.29 ~ -2.55 eV,這樣的能階範圍是能有效涵蓋一般常見的客發光體材料的HOMO/LUMO能階。此外,在分子設計中,藉由剛硬基團的導入及分子量的提升,也從TGA及DSC的數據證明了三個材料都具有良好的熱穩定性(Td > 390℃, Tg > 110℃)。 High efficiency and low driving voltage of Phosphorescent organic light-emitting diodes (PhOLEDs) has been a goal in flat-panel displays and lighting sources nowadays. The performance of the PhOLEDs can be improved substantially by doping phosphorescent dye into the bipolar host. In this work, three novel bipolar host materials (DBFIm28, DBFIm46 and DBFPhIm46) comprising of a hole-transport dibenzofuran core functionalized with electron-transport moieties (N-phenylbenzimidazole) have been synthesized.In order to assess the potential of bipolar molecules for phosphorescent application, their photophysical, electrochemical and thermal properties were characterized. The ET value of the bipolar molecule was as high as 2.52 eV in solid film which was suitable to serve as a green or red phosphor host. X-ray analysis and theoretical calculations also revealed these twisted molecular structures could reduce the {212450}-{212450} interaction due to the big torsion angles between the dibenzofuran unit and the electron-withdrawing moieties. The HOMO energy levels of these bipolar molecules measured by photoelectron spectrometer, are in the range of -5.8 ~ -5.87 eV, and the LUMO energy levels are in the range of -2.29 ~ -2.55 eV. The results exhibit that the bipolar molecules possess broad bandgap which cover the energy level of most commercial phosphorescent dopants. The TGA and DSC revealed the excellent decomposition temperature (Td > 390{212B68}) and stable glassy morphology (Tg > 110{212B68}) respectively, which suggested there was a successful strategy that the bulky and rigid structure can stabilize the thermal properties effectively.

含苯并咪唑二苯並呋喃磷光主體材料的開發 = Development of Benzimidazole-containing Dibenzofurans for Phosphorescent OLED
張, 惟嘉

含苯并咪唑二苯並呋喃磷光主體材料的開發 = Development of Benzimidazole-containing Dibenzofurans for Phosphorescent OLED / 張惟嘉撰 - [高雄市] : 撰者, 2015[民104]. - 120面 ; 圖，表 ; 30公分.
參考書目：面70-75.
有機發光二極體PhOLED

含苯并咪唑二苯並呋喃磷光主體材料的開發 = Development of Benzimidazole-containing Dibenzofurans for Phosphorescent OLED
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