Optically tunable engineered macromolecular fluorescent material analyzed using optical parameters

Abstract

AbstractThere are extensive reports on bathochromic emissive material associated with non‐covalent interaction but the reports on emissive material with covalent crosslinked approach is limited. Therefore, we highlight unique method for synthesis of crosslinked polymeric materials formed via thermal Click reaction where the static aggregate of naphthalene (Np) in Polym‐Np or pyrene (Py) in Polym‐Py showed energy tunable emission. Initially, the crosslinked polymeric materials were well‐characterized using spectroscopic and analytical methods like NMR, ATR‐FTIR, rheometer, TGA and optical analysis. The energy tunability to fluorescence emission with polynuclear aromatic hydrocarbons (PAHs) ‐ naphthalene and pyrene was observed. The quantum efficiency for the respective crosslinked polymers—Polym‐Np and Polym‐Py was found to be 2.54% and 8.72%. Moreover, the Full polarization fluorescence Mueller matrix (FLMM) spectroscopy was invoked to extract and quantify the molecular orientation of the ground and excited state of the crosslinked polymers—Polym‐Np and Polym‐Py. The polarization parameters (Fluorescence Diattenuation and Polarizance) based on fluorescence polarization showed that the PAHs within the crosslinked polymers found to be well organized in the excited state with respect to the ground state. Such materials have potential to application such as photocatalyst, chemosensor, etc.