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Stimuli-responsive polymer gels have recently attracted great attention due to their heat/solvent resistance, dimensional stability, and unique sensitivity to external stimuli. In this work, we synthesized thiol-functionalized tetraphenylethylene (TPE) and constructed polymer gels through thiol-ene click reaction. The synthetic process of the polymer gels could be monitored by fluorescence emission of TPE moieties based on aggregation-induced emission mechanism. In addition, due to the dual redoxand acid responsiveness of the polymer gels, in the presence of dithiothreitol and trifluoroacetic acid, fluorescence quenching of the polymer gels can be observed. This stimuli-responsive characteristics endows the polymer gels with potential applications in fluorescent sensing and imaging, cancer diagnosis and selfhealing materials.

The calculations of the spontaneous electric Faraday rotation (FR) and the magnetization contributed by Tb3+ ions in Tb substituted iron garnets based on the quantum theory are presented. The crystal field (CF) and the superexchange interaction are two crucial factors in determining FR and the magnetization. Every CF splitting level is nondegenerate. But the energy differences between the lowest seven CF split levels of the ground configuration are not very large comparing with the superexchange interaction upon the Tb3+ ions, so the strong admixing of these levels by the high‐order perturbation of the exchange interaction makes FR and the magnetization not small. Except FR below 150 K, the calculated results are in good agreement with experiments.