Abstract
The electrochemical luminescence of aromatic compounds in aprotic solvents was investigated using the following semiconductor electrodes: n-GaP, n-ZnO and n-SnO 2. Electrochemical luminescence by direct heterogeneous electron transfer to the excited singlet or triplet state and subsequent luminescence could in no case be detected. The discussion of the mechanism of the redox processes involved is based on experimental observations and energetic correlations which were partly obtained by measuring the capacity of the semiconductor—solvent systems used. We presume that the directly excited states are deactivated by radiationless transitions due to a heavy atom effect. This conclusion was confirmed to the extent that the naphthalin luminescence was quenched by these semiconductors at 77 K.
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