Abstract
The efficiency of transfer from the triplet of polymethylvinylketone (PMVK) to naphthalene has been measured at 77°K. The critical distance of transfer according to Hirayama is 11 · 3 Å. This is the usual value of R o for exchange interaction without migration. Singlet energy transfer from the polymer to benzophenone occurs when donor and acceptor are very close together, at room temperature. In the system PMVK-anthracene, the emission spectrum shows that microcrystals of the additive are formed in the polymer even at low concentration.
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