Optoelectronic Properties of Supramolecular Aggregates of Phenylalanine Conjugated Perylene Bisimide

摘要

abstract_textpPerylene derivatives exhibit good optoelectronic properties and in order to augment it, the self-assembly of phenyl alanine conjugated with perylene bisimide (PBI) would be a good motif because of excellent self-organizing power of both the components. So we have synthesized N, N'-di((S)-1-carboxylphenylalanine)-3,4:9,10- perylenetetracarboxyl bisimide (PPA) and have studied its self-organization in different organic solvents. Microscopic images reveal the formation of vesicles cast from chloroform. There is a gradual change in color from green to yellow to orange to red under UV light with increasing PPA concentration. The emission maximum for the lowest energy peak gradually increases with increase in PPA concentration and the emission intensity shows a maximum at a 4-8 mM concentration due to variation of self-aggregation nature. Fluorescence of PPA in other solvents also varies in a similar fashion indicating dynamic nature of the self-assembly with concentration. The current voltage (I-V) property of the dried ensemble from chloroform exhibit negative differential resistance with rectification property indicating co-existence of holes and electrons. On application of electric field the holes and electrons of the system become recombined generating luminescence, which peak position and intensity vary with increasing applied voltage./p/abstract_text