Lanthanide metal–organic framework (Ln-MOF) luminescent sensors monitoring the H₂O content in D₂O are still rare. We designed and built a hydrophilic mixed Ln-MOF (Eu_0.4Tb_0.6-MOF) monitoring the H₂O content in D₂O. By designing a ligand and controlling the synthesis method, we achieved a balance between the structural stability and sensing capacity. When the H₂O content ranges from 0 to 100%, the photoluminescence color of Eu_0.4Tb_0.6-MOF can change from yellow to green, which can be observed by the naked eye. The mechanism is that the photoluminescence intensity of Eu³⁺ decreases faster than that of Tb³⁺ when the H₂O content increases. The sensing mechanism was studied further by transient fluorescence spectrometry.

中文翻译：

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一种亲水性混合镧系金属-有机骨架监测 D2O 中的 H2O

监测D _{2 O 中 H 2} O 含量的镧系金属有机骨架 (Ln-MOF) 发光传感器仍然很少见。我们设计并构建了一种亲水性混合Ln-MOF（Eu _0.4 Tb _0.6 -MOF）监测D _{2 O中的H 2} O含量。通过设计配体和控制合成方法，我们实现了结构稳定性和传感能力之间的平衡. 当H ₂ O含量在0～100%范围内时，Eu _0.4 Tb _0.6 -MOF的光致发光颜色可以由黄色变为绿色，肉眼可以观察到。其机理是Eu ^{3+的光致发光强度}当 H ₂ O 含量增加时，其下降速度比 Tb ^3+快。通过瞬态荧光光谱法进一步研究了传感机制。