Asymmetric Dye Molecules Derivatives Functionalized Polysulfone Films for Optical Power Limiting

However, practical OL devices are currently limited by their reliance on physical doping into polymer matrices, which often leads to microphase separation and compromised performance uniformity. Herein, we report a covalent grafting strategy to fabricate intrinsic OL polymer films based on two D–A chromophores with distinct electron-donating groups.

The chromophores—featuring a pyridine acceptor and either a dimethylaminophenyl (HC) or diphenylaminophenyl (TPAHC) donor—were covalently anchored onto chloromethylated polysulfone (PSF) side chains via quaternization. A series of blend films with varying chromophore loadings were subsequently prepared by solution casting using high-transparency PSF-AF as the matrix. Open-aperture Z-scan measurements under 532 nm laser pulses revealed that both modified polymer films exhibited strong reverse saturable absorption.