Delayed Fluorescence of Complex Molecules in the Vapor Phase

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Abstract
It has been found that the vapors of several fluorescent aromatic hydrocarbons have two components in their fluorescence. These have the same emission spectrum but greatly differing decay times. The lifetime of the fast component is probably that which would be predicted from the strength of the absorption spectrum. This investigation was concerned with the slow component whose decay was exponential with a lifetime of the order of milliseconds. Detailed observation of the behavior of this lifetime as several experimental conditions were changed has shown that a bimolecular process is responsible for the delayed emission. A mechanism is proposed and discussed in detail.
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