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The Singlet–Triplet Exchange Energy in Conjugated Polymers

Title 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

Official URL: Volltext

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 > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - 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 > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
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