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dc.contributor.author黄文胜en_US
dc.contributor.authorBOON-SENG NGen_US
dc.contributor.author林宏洲en_US
dc.contributor.authorDr. Hong-Cheu Linen_US
dc.date.accessioned2014-12-12T02:29:59Z-
dc.date.available2014-12-12T02:29:59Z-
dc.date.issued2002en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#NT910159029en_US
dc.identifier.urihttp://hdl.handle.net/11536/69916-
dc.description.abstract合成及鉴定含吡啶及侧边烷氧取代基之芳香环共轭的萤光材料
学生:黄文胜 指导教授:林宏洲教授
摘要
本实验主要是以McMurry coupling reaction、Heck coupling reaction合成出一系列含吡啶之芳香共轭环的萤光材料,所有化合物经由H1-NMR、C13-NMR 和元素分析加以鉴定其结构与纯度,再与不同的质子予体酸制备成氢键错合物。在热性质方面,以热重分析仪(TGA)得知热裂解温度(Td)为259℃~413℃。由热微差扫瞄分析仪(DSC)与偏光显微镜(POM)观察出合配制成的氢键错合物中,只有PBBPOC4- ONA、PBBPOC8 -ONA显现了向列型液晶的性质,其他的错合物并没有液晶相。化合物的萤光性质则由紫外光可见光光谱仪(UV-Vis)和萤光分光光谱仪测得,化合物在极稀(10-5M)的二氯甲烷溶剂中所得到的最大吸收波长范围为388nm~448nm;最大萤光(PL)放射波长为454nm ~500nm,化合物PBBBrOC4、PBBBrOC8为发蓝绿光材料,PBBPMe、PBBPOMe、PBBPOC4、PBBPOC8为发绿光材料,量子效率为35%∼70%。当配置氢键错合物时所取用的酸pH值越强,越容易形成氢键错合物,由于拉电子效应变强,分子LUMO变低,energy band gap就变窄,所以酸度最强的THDA配成氢键错合物后,其造成红位移的现象最为明显。循环伏安法(CV)测得不可逆氧化电位,得知本系列化合物HOMO位于5.30 eV ~ 5.82 eV。由于还原电位不明显,经由λmax onset推算得知LUMO位于2.89 eV ~3.58 eV。在液晶性质和发光特性相结合的偏极化实验中,成功发现共轭萤光分子在液晶相(配位后)中可发出具有方向性的偏极化光,且Polarization ratio 约有1.43倍的差距。
zh_TW
dc.description.abstractSynthesis and characterization of novel photoluminescent materials containing conjugated-rings with pyridine
and alkoxy-substituted lateral groups
Graduate student: Boon-Seng Ng Advisor:Dr. Hong-Cheu Lin
Department of Materials Science and Engineering
National Chiao Tung University
Abstract
A series of novel photoluminescent materials with conjugated aromatic segment including end-capping pyridine and substituted alkoxy group were synthesized successfully via Mcmurry, and Heck reaction. Hydrogen bonding complexes were obtained from the mixing of these photolumines -cent compounds with different proton donors containing carboxylic acids groups in THF/CH2Cl2. The thermal properties of these materials were measured by TGA. The decomposition temperature at 5% weight loss (Td) of all compounds ranged from 259℃~413℃. DSC and POM claimed that most of these compounds have no mesogenic phase except PBBPOC4-ONA and OBBPOC8-ONA. The optical properties of these materials were measured by UV-Vis and PL (photoluminescence) spectroscopic studies. These compounds exhibited maximum absorption in the range of 388nm ~448nm in diluted CH2Cl2. They emitted blue-green to green fluorescence around 456~500nm in CH2Cl2. The quantum efficiency of them were ranged from 35%~70% comparing to coumarin 6. For a good formation of Hydrogen-bonding complexes, the highly acidic proton donor should be used . The energy band gap was shortened once the Hydrogen- bonding complexes were formed. According to the PL spectra, the complexes whose contains THDA showing the most apparent red-shifted emission due to its lowest pka value. The CV showed that the HOMO and LUMO of these compounds were located at 5.30 eV ~ 5.82 eV and 2.89 eV ~3.58 eV respectively. The polarization measurement showed the existence of the polarized light and the polarization ratio is about 1.43 .
en_US
dc.language.isozh_TWen_US
dc.subject氢键液晶zh_TW
dc.subject有机发光zh_TW
dc.subject吡啶zh_TW
dc.subject共轭环zh_TW
dc.subjecthydrogen bonding liquid crystalen_US
dc.subjectorganic light emittingen_US
dc.subjectpyridineen_US
dc.subjectconjugated ringen_US
dc.title合成及鉴定含吡啶及侧边烷氧取代基之共轭环萤光材料zh_TW
dc.titleSynthesis and characterization of novel photoluminescent materials containing conjugated- rings with pyridine and alkoxy-substituted lateral groupsen_US
dc.typeThesisen_US
dc.contributor.department材料科学与工程学系zh_TW
显示于类别:Thesis