Development and detection of level II and III features of latent fingerprints using highly sensitive AIE based coumarin fluorescent derivative

Abstract

In recent times, the crime rate is increasing in the society, and the maintaining of criminal records is becoming essential by locating and tracking each case through latent fingerprint identification along with the imperative of finding the intensity and wavelength via Aggregation Induced Emission (AIE). To meet these demands, we have designed a novel AIE based electron withdrawing moiety such as 2-(4-fluorophenyl)-3H-benzocoumarin. This Coumarin Fluorescent Tag (CFT) was synthesized with the aid of ultra-sonic waves. Fluorescence properties of the CFT were characterized by photoluminescence (PL). The Fluoro functional groups of CFT produce pale-blue emission in solid as well as the liquid state. An in-depth examination of latent fingerprints (LFPs) showed unchangeable and everlasting patterns due to the strong adsorption of CFT on the ridges of the finger under visible and 365 nm UV light. This imaging of such strong ridges becomes a crucial element in forensic applications. In addition to check the AIE properties, the newly designed CFT was investigated using PL Instrument and UV chamber.