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Polycyclic p-conjugated molecules, such as anthracene and pyrene, are employed in many systems owing to their electroand photophysical properties. Their properties in solid state depend not only on the molecular structure but on the molecular arrangements. As for the photoluminescent properties, there are several reports on the relationships with molecular arrangements. However, the relationships have not been elucidated exactly and therefore further study is necessary for the application to the development of sophisticated organic devices. Here, we present drastic modulation of luminescent color triggered by change of the anthracene arrangement of ammonium anthracene-1,8-disulfonate. The organic salts gave seven kinds of anthracene arrangements depending on the amine of the salts. Alkyl chain of n-butylamine surround anthracene moieties, resulting in blue luminescence attributed to monomer emission. Whereas, s-butylamine afforded formation of dimer pairs and contact of the pairs, resulting in orange luminescence attributed to excimer emission. Up to 150 nm of red shift depending on anthracene arrangements was achieved.

Drastic modulation of solid-state luminescence derived from molecular arrangement of organic salts