Two novel oligomers based on fluorene and pyridine: Correlation between the structures and optoelectronic properties |
| |
Authors: | Hong‐Ji Jiang Hong‐Yu Wang Rui Zhu Jun‐Hua Wan Feng Liu Jia‐Chun Feng Wei Wei Wei Huang |
| |
Institution: | 1. Jiangsu Key Lab of Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210003, People's Republic of China;2. Institute of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China;3. Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 310012, People's Republic of China |
| |
Abstract: | To investigate the fine optoelectronic difference of the target oligomers with or without peripheral fluorene moieties, two dumbbell‐shaped oligomers ( F0 and F1 ) were designed and convergently prepared via Suzuki coupling reaction. The molecular structures of the oligomers were fully characterized by 1H NMR, 13C NMR, and MALDI‐TOF mass spectra, respectively. The absorption, photoluminescent behavior, and energy band gaps of the oligomers were examined through UV–vis, photoluminescent spectra and cyclic voltammetry. The experimental results demonstrate that the absorption and photoluminescent properties are little affected by molecular architecture, while the absolute photoluminescence quantum efficiency of films and energy band gaps derived from cyclic voltammetry in solution are strongly correlated with the molecular frameworks. The observed energy band gaps of oligomers are further validated by the different molecular orbital contours of the HOMO energy levels from theoretical calculations. Preliminary electroluminescent investigations for F1 have also been conducted and discussed. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 1548–1558, 2008 |
| |
Keywords: | band gap branched dumbbell‐shaped efficiency fluorene oligomers optoelectronic pyridine synthesis |
|
|