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Excitonic singlet-triplet ratios in molecular and polymeric organic materials
Abstract
A simple technique employing reverse bias measurements of photoluminescent efficiency is described to determine the excitonic singlet-triplet formation statistics of electroluminescent organic thin films. Using this method, the singlet fractions in thin films of two organic emissive materials commonly used in organic light emitting devices, tris(8-hydroxyquinoline) aluminum $({\mathrm{Alq}}_{3})$ and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), are found to be $(20\ifmmode\pm\else\textpm\fi{}1)%$ and $(20\ifmmode\pm\else\textpm\fi{}4)%,$ respectively. Results are confirmed using a sensitive synchronous detection scheme. We discuss other measurements and the current understanding of exciton formation statistics in polymeric and small molecular weight organic electroluminescent materials.
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Cited by
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Wong, W.-Y., & Ho, C.-L. (2009) · Coordination Chemistry Reviews · doi:10.1016/j.ccr.2009.01.013 · Cited by 622
Shuai, Z., & Peng, Q. (2014) · Physics Reports · doi:10.1016/j.physrep.2013.12.002 · Cited by 477
Kim, J. U., Park, I. S., Chan, C.-Y., Tanaka, M., Tsuchiya, Y., Nakanotani, H., & Adachi, C. (2020) · Nature Communications · doi:10.1038/s41467-020-15558-5 · Cited by 441
Xue, J., Liang, Q., Wang, R., Hou, J., Li, W., Peng, Q., Shuai, Z., & Qiao, J. (2019) · Advanced Materials · doi:10.1002/adma.201808242 · Cited by 409
Metadata
- Authors
- Segal, M., Baldo, M. A., Holmes, R. J., Forrest, S. R., & Soos, Z. G.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2003-08-28
- Volume
- 68
- Issue
- 7
- ISSN
- 0163-1829 (ISSN-L)
- 1095-3795
- OpenAlex
- W1973249455
- Cited by
- 359
- References
- 0
- FWCI
- 15.08
- Type
- journal article
- Language
- en
- Open access
- closed
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- Segal, M., Baldo, M. A., Holmes, R. J., Forrest, S. R., & Soos, Z. G. (2003). Excitonic singlet-triplet ratios in molecular and polymeric organic materials. Physical Review B. https://doi.org/10.1103/physrevb.68.075211
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