Room-Temperature Phosphorescent Materials: Synergistic Hydrogen Bonds and Ionic Interactions

Le résumé fourni par la source

Organic room-temperature phosphorescent (RTP) polymers lacking aromatic conjugation are highly sought after for advanced anticounterfeiting applications but remain difficult to develop due to poor triplet exciton stabilization and limited emission tunability. Herein, we report a nonconjugated copolymer, poly(maleic anhydride- co -hydroxyethyl methacrylate) (PMHEMA), featuring dual hydrogen-ionic networks that confer both solvent resistance and wavelength-tunable RTP. The synergistic effect of hydrogen bonds and ionic interactions effectively suppresses nonradiative decay. By systematically varying the alkyl side chain length ( C 1– C 6) and thermal treatment duration (0–72 h), spatial hindrance and molecular packing are finely tuned, yielding a phosphorescence lifetime of 73.34 ms, a quantum yield of 16.09%, and emission wavelengths ranging from 490 nm (blue–green) to 630 nm (orange–red). Using two-dimensional correlation spectroscopy (2D-COS), we elucidated the cooperative effects among carbon-based functional groups and their temperature-dependent response sequence. Thermal treatment induces dynamic and reversible cross-linking via ether bonds, enhancing polymer chain rigidity. The resulting materials exhibit excellent environmental stability and solvent resistance. These findings establish PMHEMA derivatives as promising platforms for multilevel dynamic encryption and high-security anticounterfeiting and expand the scope of RTP materials in smart optoelectronic applications.

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