完整后设资料纪录
DC 栏位 | 值 | 语言 |
---|---|---|
dc.contributor.author | 黄文胜 | en_US |
dc.contributor.author | BOON-SENG NG | en_US |
dc.contributor.author | 林宏洲 | en_US |
dc.contributor.author | Dr. Hong-Cheu Lin | en_US |
dc.date.accessioned | 2014-12-12T02:29:59Z | - |
dc.date.available | 2014-12-12T02:29:59Z | - |
dc.date.issued | 2002 | en_US |
dc.identifier.uri | http://140.113.39.130/cdrfb3/record/nctu/#NT910159029 | en_US |
dc.identifier.uri | http://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.abstract | Synthesis 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.iso | zh_TW | en_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.subject | hydrogen bonding liquid crystal | en_US |
dc.subject | organic light emitting | en_US |
dc.subject | pyridine | en_US |
dc.subject | conjugated ring | en_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.title | Synthesis and characterization of novel photoluminescent materials containing conjugated- rings with pyridine and alkoxy-substituted lateral groups | en_US |
dc.type | Thesis | en_US |
dc.contributor.department | 材料科学与工程学系 | zh_TW |
显示于类别: | Thesis |