Solid supramolecular architecture of a perylene diimide derivative for fluorescent enhancement

A new p-phenylenevinylene-linked perylene diimide has been synthesized and self-assembled for the formation of zero-dimensional molecular aggregate structures of nanospheres and vesicles through solvent tuning. The solid-state optical properties induced by a special wavelength laser were studied and the results indicated excellent fluorescent enhancement properties. The emission intensity of these aggregates increased with elongation of the laser irradiation time. Based on the analysis of variable-temperature (1)H NMR spectra, DFT calculations, and the single-crystal structure of the linkage group, a conformation-dependent fluorescent enhancement mechanism could be demonstrated. The mechanism is different from the fluorescent bleaching of normal solid-state fluorescent materials and offers potential applications in optical devices.