Modulating absorption and emission of smart fluorescent organic probes through tailored physicochemical properties

The newly fabricated fluorescent organic nanoparticles (FONs) with size 80.94 nm as renowned contender has facile synthesis, robust tunable fluorescence, unique optical properties and great potential in sensing at trace level. The optical properties of fluorescent organic probe depend on the experimental parameters e.g. synthesis routes, doping, solvatochromism, temperature, pH and the types of precursors, which influence the surface state and graphitic carbon-cluster. The incorporation of N-atom modified the intrinsic properties (π-π^∗, n-π^∗ electronic transition) and caused the change in energy level Δ[Formula: see text] from 2.81 eV to 2.43 eV. The fluorescent intensity decreased as increasing or decreasing from pH ~ 7 due to change in extended delocalization. The temperature-dependent florescence response showed differently in different solvents owing to various interactions between surface state of fluorescent organic probe and solvents. The fluorescent organic probe demonstrated excellent qualitative and visual detection of water content in organic solvents due to solvatochromism. This strategy enables the bathochromic shift Δλ_em in fluorescent organic probe for the generation of multicolor. Moreover, the fluorescent organic probe can be used as a fluorescent ink for anti-counterfeiting. This research aims to provide a detailed examination of experimental parameters as a valuable tool for the synthesis of fluorescent organic nanoparticles FONs.