“…[11][12][13][14] So far, numerous fluorescent materials for constructing Fe 3+ sensors have been reported in the literature, including metal-organic frameworks, [15][16][17] metal nanoclusters, 18,19 small organic molecules and polymers. [20][21][22][23][24] Nonetheless, these materials have certain drawbacks that cannot be overlooked, such as heavy metal environmental pollution, poor optical stability, poor water solubility, and complex synthesis, which significantly limits their applications.…”