Intersystem crossing mechanisms and single molecule fluorescence: Terrylene in anthracene crystals
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- 作者：M. A. Kol鈥檆henko (1)
B. Kozankiewicz (12)
A. Nicolet (1)
M. Orrit (1) orrit@molphys.leidenuniv.nl - 刊名：Optics and Spectroscopy
- 出版时间：May 2005
- 出版年：2005
- 期刊代码：22_0030-400x
- 类别：ph
- 卷：98
- 期：5
- 页码：681-686
- 数据来源：sp
摘要
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.