The design and fabrication of rare earth ions incorporated into the inorganic/organic hybrid materials have attracted growing attention for seeking improved optical properties and photofunctional performances. In this paper, a novel hybrid composite based on the layered rare earth hydroxides was successfully prepared by the ion-exchange and intercalation chemical process. The rare earth elements in the composite contain gadolinium (Gd) and europium (Eu) and the molar ratio of Gd to Eu is kept constant at 1.9 : 0.1. Organic sodium dodecyl sulfonate and dye coumarin-3-carboxyllc acid are simultaneously incorporated into the layered rare earth hydroxides as supporting agent and light-harvesting antenna, respectively. The resulting hybrid layered rare earth hydroxides exhibit the enlarged interlayer distance with about 2.60 nm, and the chemical composition was confirmed through X-ray diffraction, carbon, hydrogen and nitrogen (CHN) elemental analysis, infrared spectroscopy, and thermogravimetric analysis. The layered solid compound shows the characteristic red emission corresponding to the ⁵D₀→⁷F₂ transition of Eu³⁺ ion, and the luminescence intensity of the optimized compound is greatly enhanced as compared to its corresponding nitrate and the hybrid composite without the introduction of dye molecule. The hybrid layered rare earth hydroxides can be exfoliated into bright colloidal solution, which show superior recognition capability to Cu²⁺ ion with the distinct luminescence quenching. The large quenching constant (1.4 × 10⁴ L/mol) and low detection limit (0.35 μmol/L) are achieved for Cu²⁺ ion, implying a “turn-off” fluorescent sensor for Cu²⁺ detection. Moreover, a transparent film was prepared based on the colloidal solution and displays the typical red emission in folded shape. The new hybrid compound with enhanced luminescence and excellent photofunctional performances is expected to be applied in the fields of fluorescent sensing and flexible optical devices.

掺入无机/有机杂化材料中的稀土离子的设计和制造已引起越来越多的关注，以寻求改善的光学性能和光功能性能。本文通过离子交换和插层化学工艺成功制备了一种基于层状稀土氢氧化物的新型杂化复合材料。复合材料中的稀土元素含有钆（Gd）和铕（Eu），Gd与Eu的摩尔比保持在1.9:0.1。将有机十二烷基磺酸钠和染料香豆素-3-羧酸同时掺入到层状稀土氢氧化物中，分别作为载体和集光天线。得到的混合层状稀土氢氧化物表现出扩大的层间距离，约为 2.60 nm，并通过X射线衍射、碳、氢和氮（CHN）元素分析、红外光谱和热重分析确定了化学成分。层状固体化合物显示出与^{Eu 3+离子发生5} D ₀ → ⁷ F ₂跃迁，与相应的硝酸盐和未引入染料分子的杂化复合材料相比，优化后的化合物的发光强度大大提高。混合层状稀土氢氧化物可以剥离成明亮的胶体溶液，对Cu ²⁺离子具有优异的识别能力，具有明显的发光猝灭特性。Cu 2+ 离子具有大的猝灭常数（1.4 × 10 ⁴  L/mol）和低检测限（0.35 μmol/L），这意味着Cu ^2+的“关闭”荧光传感器检测。此外，基于胶体溶液制备了透明薄膜，并以折叠形状显示典型的红色发射。这种具有增强发光和优异光功能性能的新型杂化化合物有望应用于荧光传感和柔性光学器件领域。