Publication Type |
Journal Article |
School or College |
College of Science |
Department |
Physics |
Creator |
Vardeny, Zeev Valentine |
Other Author |
Yang, C.; Kohler, A.; Wohlgenannt, M.; Al-Suti, M. K.; Khan, M. S. |
Title |
Spectroscopic study of spin-dependent exciton formation rates in ∏-conjugated semiconductors: comparison with electroluminescence techniques |
Date |
2004-12 |
Description |
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. |
Type |
Text |
Publisher |
American Physical Society |
Journal Title |
Physical Review B |
Volume |
70 |
Issue |
24 |
First Page |
241202 |
Last Page |
241201 |
DOI |
10.1103/PhysRevB.70.241202 |
citatation_issn |
1098-0121 |
Subject |
Spin-dependent exciton formation; pi-conjugated polymers |
Subject LCSH |
Conjugated polymers -- Optical properties; Organic semiconductors -- Optical properties; Exciton theory |
Language |
eng |
Bibliographic Citation |
Yang, C., Vardeny, Z. V., Kohler, A., Wohlgenannt, M., Al-Suti, M. K., & Khan, M. S. (2004). Spectrosopic study of spin-dependent exciton formation rates in ∏-conjugated semiconductors: comparison with electroluminescence techniques. Physical Review B, 70(24), 241202-1-4. |
Rights Management |
(c) American Physical Society http://dx.doi.org/10.1103/PhysRevB.70.241202 |
Format Medium |
application/pdf |
Format Extent |
52,525 bytes |
Identifier |
ir-main,10067 |
ARK |
ark:/87278/s6086pg3 |
Setname |
ir_uspace |
ID |
702962 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6086pg3 |