Intersystem crossing mechanisms and single molecule fluorescence: Terrylene in anthracene crystals
- 229 Downloads
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.
KeywordsNaphthalene Single Molecule Molecule Investigation Host Matrix Molecule Fluorescence
Unable to display preview. Download preview PDF.
- 3.Single Molecule Optical Detection, Imaging and Spectroscopy, Ed. by T. Basché, W. E. Moerner, M. Orrit, and U. P. Wild (VSH, Weinheim, Germany, 1997).Google Scholar
- 6.E. A. Donley, V. Burzomato, U. P. Wild, and T. Plakhotnik, J. Lumin. 83–84, 255 (1999).Google Scholar
- 7.R. I. Personov, in Spectroscopy and Excitation Dynamics of Condensed Molecular Systems, Ed. by V. M. Agranovich and R. M. Hochstrasser (North-Holland, Amsterdam, 1983; Nauka, Moscow, 1987), Chap. 10.Google Scholar
- 13.S. P. McGlynn, T. Azumi, and M. Kinoshita, Molecular Spectroscopy of the Triplet State (Prentice Hall, Englewood Cliffs, N.J., 1969; Mir, Moscow, 1972).Google Scholar