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<p>The rational design and synthesis of a white-light-emission metal-organic framework (MOF) composite, SQDs/Eu³⁺@UIO-66, via in-situ encapsulation of sulfur quantum dots (SQDs) and Eu³⁺ ions into the UIO-66 framework is reported. The composite exhibits near-white-light emission with CIE coordinates of (0.3322, 0.3522). Fluorescence sensing studies revealed that SQDs/Eu³⁺@UIO-66 enables simultaneous detection of multiple environmental contaminants, including tetracycline (TET), ornidazole (ODZ), ciprofloxacin (CIP), and hexavalent chromium species (Cr₂O₇²⁻/CrO₄²⁻). Specifically, TET, ODZ, and Cr(VI) (Cr₂O₇²⁻/CrO₄²⁻) induce pronounced fluorescence quenching, with limits of detection (LODs) of 0.15 mM, 0.13 mM, 57.5 µM, and 0.17 mM, respectively. In contrast, CIP triggers significant fluorescence enhancement, enabling ratiometric detection via the I₄₇₀/I₆₁₇ intensity ratio, achieving a LOD of 0.82 µM. Furthermore, a mixed-matrix membrane fabricated by incorporating the composite into a poly(vinylidene fluoride) (PVDF) matrix demonstrated effective detection in real water samples, along with visual signal readout and UV-responsive optical encryption capability. The integration of dual-emission luminescence, ratiometric and colorimetric sensing modes, and excellent recyclability establishes SQDs/Eu³⁺@UIO-66 as a highly versatile platform for environmental monitoring, optical sensing, and multifunctional optoelectronic applications.</p> Graphical Abstract <p></p>

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Multifunctional white-light-emission SQDs/Eu³⁺@UIO-66: ratiometric sensing, smartphone-assisted antibiotics/Cr(VI) detection, and information encryption

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Fengqin Wang,
  • Yihui Wang,
  • Jiayi Liu,
  • Guojun Ding,
  • Tong Zeng,
  • Meng Gao,
  • Jialin Li,
  • Fanyong Yan

摘要

The rational design and synthesis of a white-light-emission metal-organic framework (MOF) composite, SQDs/Eu³⁺@UIO-66, via in-situ encapsulation of sulfur quantum dots (SQDs) and Eu³⁺ ions into the UIO-66 framework is reported. The composite exhibits near-white-light emission with CIE coordinates of (0.3322, 0.3522). Fluorescence sensing studies revealed that SQDs/Eu³⁺@UIO-66 enables simultaneous detection of multiple environmental contaminants, including tetracycline (TET), ornidazole (ODZ), ciprofloxacin (CIP), and hexavalent chromium species (Cr₂O₇²⁻/CrO₄²⁻). Specifically, TET, ODZ, and Cr(VI) (Cr₂O₇²⁻/CrO₄²⁻) induce pronounced fluorescence quenching, with limits of detection (LODs) of 0.15 mM, 0.13 mM, 57.5 µM, and 0.17 mM, respectively. In contrast, CIP triggers significant fluorescence enhancement, enabling ratiometric detection via the I₄₇₀/I₆₁₇ intensity ratio, achieving a LOD of 0.82 µM. Furthermore, a mixed-matrix membrane fabricated by incorporating the composite into a poly(vinylidene fluoride) (PVDF) matrix demonstrated effective detection in real water samples, along with visual signal readout and UV-responsive optical encryption capability. The integration of dual-emission luminescence, ratiometric and colorimetric sensing modes, and excellent recyclability establishes SQDs/Eu³⁺@UIO-66 as a highly versatile platform for environmental monitoring, optical sensing, and multifunctional optoelectronic applications.

Graphical Abstract