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Spectroscopic study of spin-dependent exciton formation rates in π-conjugated semiconductors: Comparison with electroluminescence techniques

Title data

Yang, C. ; Vardeny, Z. V. ; Köhler, Anna ; Wohlgenannt, M. ; Al-Suti, Mohammed K. ; Khan, Muhammad S.:
Spectroscopic study of spin-dependent exciton formation rates in π-conjugated semiconductors: Comparison with electroluminescence techniques.
In: Physical Review B. Vol. 70 (2004) .
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.70.241202

Official URL: Volltext

Abstract in another language

It has been found in recent measurements that the singlet-to-triplet exciton ratio in organic light-emitting diodes (OLEDs) is larger than expected from spin degeneracy, and that singlet excitons form at a larger rate than triplets. We employed the technique of optically detected magnetic resonance to measure the spin-dependent exciton formation rates in films of a polymer and corresponding monomer, and explore the relation between the formation rates and the actual singlet-to-triplet ratio measured previously in OLEDs. We found that the spin-dependent exciton formation rates can indeed quantitatively explain the observed exciton yields, and that singlet formation rates and yields are significantly enhanced only in polymer OLEDs, but not in OLEDs made from the corresponding monomer.

Further data

Item Type: Article in a journal
Refereed: No
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 13:52
Last Modified: 16 Mar 2015 13:52
URI: https://eref.uni-bayreuth.de/id/eprint/8327