Abstract: In the present work, coumarin has been subjected to photophysical analysis. Though the influence of the electron-donating groups such as amino, substituted amino, hydroxyl, alkoxy groups, etc. at position 7 of the coumarin ring system has been extensively studied, the luminescent properties of the coumarin moieties with an aliphatic amine substituent have not been explored. Here it is attempted to study the variation of fluorescent lifetime behaviour of coumarin with n-butyl anine (NBA).