1.含噻吩、芴基混成之星狀有機共軛材料 2.茚芴之共軛寡聚物的合成與性質研究
1. Starburst Molecules Based on Thiophene and Fluorene 2. Syntheses and Property Studies of Indenofluorene Derivatives
Date Issued
2005
Date
2005
Author(s)
Huang, Shih-Chiang
DOI
zh-TW
Abstract
Oligothiophene have been used in many applications as active materials during the past years. Application in organic light emitting diodes would be limited due to lower quantum yield. We design in this thesis a novel series of starburst molecules based on thiophene and 9,9-ditolylfluorene hybridized. However, the bulkiness and rigidity of the terminal 9,9-ditolylfluorene moieties plays an important role to improve the quantum yield and thermal stability. As we expected that the PSFn in this study exhibit highly quantum yield (> 99 %) and show distinct and high glass transition temperatures from ranging from 166 to 205 ℃.The second part of this thesis is the synthesis and properties of indenofluorene-based conjugate materials. The short emission wavelength and large band gap indicate a great potential as host materials in organic light-emitting diodes. The compounds InF3-tt、InF3-tp and InF4 are different from the conjugation lengths on the core. In order to increase the steric hindrance, we have introduced numbers of aryl groups in the periphery to prevent intermolecular interactions and improve the morphological and thermal stability of the resulting organic materials. Energy level of InF3-tt、InF3-tp and InF4 could be determined using the data from cyclic voltammetry and absorption spectra. By calculating with the HOMO-LUMO band gap measured from the electrochemical processes, the values are 3.88 eV (InF3-tt)、3.84 eV (InF3-tp) and 3.64 eV (InF4).
Subjects
噻
吩
芴基
茚
芴
thiophene
fluorene
indenofluorene
Type
thesis
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