Singlets annihilated: A single-molecule fluorescence spectroscopic study of multichromophoric peryleneimide-substituted polyphenylene-core dendrimers under various conditions indicates that increased intersystem crossing (see graphic) as a consequence of an annihilation process might represent a general motif for increased photobleaching of the first intensity levels in multichromophoric systems.
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Tinnefeld et al. (2004) studied this question.
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