The incorporation of luminescent lanthanide complexes in inorganic matrices opens appealing possibilities in the rational upstream conception of new luminescent materials with easier recyclability. In this regard, the influence of SBA‐15 mesoporous silica, as a host matrix, on the photophysical properties of europium‐trisdipicolinate cesium salt is investigated. The lanthanide complex can be completely and reversibly adsorbed on the silica, using incipient wetness impregnation (IWI) in WATER, without the need of anchoring groups or covalent bonding on the silica surface. This specific procedure allows the homogeneous dispersion of the lanthanide complex into the host silica matrix. Appropriately assessing the photophysical properties of the targeted luminescent material proved remarkably challenging, demanding utmost caution, particularly due to the strong scattering of the mesoporous matrices. Additionally, while the observations confirm an important increase of luminescence lifetimes of lanthanide complexes upon integration into these mediums, this variation is attributed to the differing refractive indexes and not to specific surface interactions or confinement effect. Indeed, it appeared that previous literature precedents depicted erroneous exhalations of the complexes intrinsic quantum yield due to the repeated use of erroneous refractive index values. In the meantime, the luminance of these materials under UV irradiation improves drastically in comparison to what is obtained with the physical dispersion of micro‐crystals of the lanthanide complex onto silica. It is demonstrated that this improvement is due to a reduced inner filter effect in the adsorbed samples. In this regard, IWI of lanthanide complexes in the mesoporous matrices method could be of interest in the development of recyclable emitting layers, less demanding in terms of emitter quantity.

中文翻译：

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介孔二氧化硅基质中镧系元素络合物的发光：吸附在 SBA-15 中的三吡啶二羧酸铕络合物的教科书示例

将发光稀土配合物掺入无机基质中，为具有更容易回收性的新型发光材料的合理上游概念开辟了诱人的可能性。在这方面，研究了SBA-15介孔二氧化硅作为主体基质对铕-三吡啶二羧酸铯盐光物理性质的影响。使用水中的初湿浸渍（IWI），可以将镧系元素络合物完全可逆地吸附在二氧化硅上，而不需要二氧化硅表面上的锚定基团或共价键合。该特定程序允许镧系元素络合物均匀分散到基质二氧化硅基质中。事实证明，适当评估目标发光材料的光物理性质非常具有挑战性，需要极其谨慎，特别是由于介孔基质的强烈散射。此外，虽然观察结果证实了镧系元素配合物在融入这些介质后发光寿命显着增加，但这种变化归因于不同的折射率，而不是特定的表面相互作用或限制效应。事实上，之前的文献先例似乎描述了由于重复使用错误的折射率值而导致复合物固有量子产率的错误呼出。同时，与将镧系元素配合物的微晶物理分散到二氧化硅上所获得的亮度相比，这些材料在紫外线照射下的亮度大大提高。事实证明，这种改进是由于吸附样品中内部过滤效果的降低所致。在这方面，介孔基质方法中的镧系元素络合物的 IWI 可能对可回收发射层的开发感兴趣，对发射体数量的要求较低。