Abstract
Fluorescence emitted from the locally excited (LE) state of the carbazole chromophore (CZ) linked to terephthalic acid methyl ester (TPA) by a methylene chain is enhanced by an electric field in a polymer film, when the chain length is very short. It is suggested that the enhancement of the LE fluorescence results from the field-induced increase in efficiency of the back-electron transfer, which occurs through a methylene chain following photoinduced electron transfer and leads to the fluorescent state of CZ.
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