at Google ScholarTitle data
Köhler, Anna ; Beljonne, David:
The Singlet–Triplet Exchange Energy in Conjugated Polymers.
In: Advanced Functional Materials.
Vol. 14
(2004)
Issue 1
.
- pp. 11-18.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.200305032
Abstract in another language
Electron–electron interactions in organic semiconductors split the lowest singlet and triplet states by the exchange energy, ΔEST. Measurement of singlet and triplet emission spectra in a large number of conjugated polymers yield an almost constant ΔEST value close to 0.7 eV. This is in contrast to the situation in molecules, where the exchange energy is found to depend on molecular size and to vary over a wide range. Quantum-chemical calculations are performed to address the origin of the constant exchange energy in phenylene-based conjugated polymers. The electron–hole separation in the lowest singlet and triplet excited states is found to be independent of the π-conjugated backbone, and saturates for chains longer than a few repeating units, resulting in a constant exchange energy. In shorter conjugated oligomers, confinement of the excitations destabilizes the singlet with respect to the triplet through exchange interactions and leads to a larger and size-dependent singlet–triplet energy separation.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | No |
| Keywords: | Exchange energy;Polymers, conjugated;Quantum chemical calculations;Singlet energy level;Triplet energy level |
| Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter |
| Result of work at the UBT: | No |
| DDC Subjects: | 500 Science > 530 Physics |
| Date Deposited: | 16 Mar 2015 13:34 |
| Last Modified: | 16 Mar 2015 13:34 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/8328 |