Spectral Dependence of Fluorescence Lifetime as a Monitor for Purity of Fluoranthene Crystal

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Abstract
Fluorescence lifetime was successfully used aa a monitor for the purity of solid fluoranthene purified by several different methods; i.e., sublimation in vacuo, zone refining, a newly developed chemical process, and the chemical process followed by zone refining. The spectral response of the lifetime was found to be an appropriate criterion for purity. The chemical process followed by zone refking waa found to be an excellent method for purification of fluoranthene. Furthermore, studies were made on the effect of such impurities as anthracene, carbazole, fluorene, and naphthacene on the lifetime and its spectral dependence.