Intersystem Crossing Mechanisms and Single Molecule Fluorescence: Terrylene in Anthracene Crystals
| Autor: | Michel Orrit, M. A. Kol'chenko, Bolesław Kozankiewicz, Aurélien A. L. Nicolet |
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| Rok vydání: | 2005 |
| Předmět: |
Anthracene
Materials science Intermolecular force Single-molecule experiment Photochemistry Fluorescence Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound Intersystem crossing chemistry Singlet fission Singlet state Physics::Chemical Physics Spectroscopy |
| Zdroj: | Optics and Spectroscopy. 98:681 |
| ISSN: | 0030-400X |
| DOI: | 10.1134/1.1929053 |
| Popis: | Single molecule spectroscopy requires molecules with low triplet yields and/or short triplet lifetimes. The intersystem crossing (ISC) rate may be dramatically enhanced by the host matrix. Comparing the fluorescence intensity of single terrylene molecules in para-terphenyl, naphthalene, and anthracene crystals, we found a reduction of the saturation intensity by three orders of magnitude in the latter case. The fluorescence autocorrelation function indicates that the bottleneck state is the terrylene triplet. We propose a ping-pong mechanism between host and guest. This intermolecular ISC mechanism, which can open whenever the host triplet lies lower than the guest singlet, was overlooked in previous single molecule investigations. |
| Databáze: | OpenAIRE |
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