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Perylene diimide (PDI) 3 and 4 appended with 8-hydroxyquinoline derivatives have been synthesized and their photophysical and spectroscopic properties have been experimentally determined. Moreover, PDIs 3 and 4 show ratiometric behavior to detect Cu colorimetrically with visible color change from coral red to light pink, whereas 3 and 4 show 'turn-off' behavior in fluorescence with lowest limit of detection 5 × 10 M. The PDI 3 could be further utilized for ratiometric CN detection colorimetrically and as 'turn-on' sensor for CN detection fluorometrically with lowest limit of detection 8 × 10 M. The comparison of spectroscopic properties of PDI 1-4 highlights the importance of linking 8-hydroxyquinoline units on the PDI core at bay position for achieving Cu recognition event into ratiometric signal. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]