| 학회 |
한국고분자학회 |
| 학술대회 |
2019년 가을 (10/09 ~ 10/11, 제주컨벤션센터) |
| 권호 |
44권 2호 |
| 발표분야 |
Korea-Germany Joint Symposium: Self-Organized Materials for Optoelectronics (English) |
| 제목 |
Single Molecule Spectroscopy of a Ladder-type Conjugated Polymer: On the Origin of the Green Emission |
| 초록 |
The origin of the unwanted green emission in poly(fluorene)-type conjugated polymers is still under debate. Photo-oxidation leading to keto-defects, as well as excimer formation or charge-transfer states have been discussed as possible sources of this emission. To shed more light on this topic, we have conducted single molecule spectroscopy experiments with poly(ladder-type pentaphenylene) (LPPentP) between room and liquid helium temperatures. Due to their rigid backbone, these conjugated polymer chains should be less prone to structural relaxation after electronic excitation. At room temperature rich spectral dynamics is observed for basically every single chain while at low temperature under a helium atmosphere these dynamics are much less abundant. Together with the spectral shifts significant changes of fluorescence lifetimes occurred. Our findings suggest that in LPPentP photo-oxidation is the main source of the red-shifted emission rather than conformational changes or aggregation. |
| 저자 |
Stefan Thoms1, Klaus Müllen2, Thomas Basché1
|
| 소속 |
1Institute of Physical Chemistry, 2Johannes-Gutenberg Univ. |
| 키워드 |
- |
| E-Mail |
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