To evaluate the sensing ability of PTE-EA for the detection Cu 2+ , [Copper(II)perchlorate used as source of Cu 2+ for all of the measurements in the manuscript] both UV-Visible and fluorescence spectra of PTE-EA were recorded in HEPES buffer:CH3CN (3:7, v/v, pH 7.3). PTE-EA showed a strong ICT based absorption band at 536 nm with a very weak perylene's π-π* absorption transition band 460 nm and emission band at 520 nm with feeble fluorescence intensity.