A number of organic compounds have been studied for a comparison of photovoltaic behavior and fluorescent properties. No definite correlation could be found between visual fluorescence and the photovoltaic response. The photopotentials were measured by using a platinum point as the irradiated electrode connected to a vacuum tube electrometer. The irradiated electrode is assumed to act as a collector in the ``space charge'' of the photoactive molecules. Both positive and negative photopotentials were obtained. Compounds possessing a carbonyl group adjacent to an aromatic nucleus invariably produced a positive photopotential.
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