Low-cost, high-performance luminescent probes with wide application potential have been actively pursued. Conventional luminescent probes, which rely on single or dual emissions responsive to analyte molecules, demonstrate limited sensitivity and selectivity because the single emissions can be easily affected by many non-analyte factors, while the dual emissions can only offer single-ratiometric luminescent sensing. Here we report a white-light-emitting trichromatic MOF composite (W2) as the first multidimensional ratiometric luminescent probe. It is facilely synthesized by simultaneously incorporating red- and green-emitting iridium and ruthenium complex cations as encapsulated luminescent modules (ELMs) into a porous blue-emitting MOF via ion exchange. Specific volatile organic solvents (VOSs) can cause VOS-dependent changes to the MOF-to-ELM energy transfer efficiencies in W2, while nitroaromatic (NAC) vapors intriguingly and unprecedentedly quench the three emissions at different rates, both of which enable visible luminescent sensing. Each VOS can be correlated to a unique combination of the two MOF-to-ELM ratios of emission-peak heights, enabling a two-dimensional (2D) code recognition. Furthermore, the time-dependent evolution of the two ratios upon exposure to selective NAC vapors can be mapped out, achieving the first 3D code recognition. Both the synthetic and sensing strategies can be further implemented to develop low-cost and effective luminescent probes.

中文翻译：

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用于多维比例发光感应的三色MOF复合材料†

积极寻求具有广泛应用潜力的低成本，高性能发光探针。传统的发光探针依赖于对分析物分子作出反应的单次或两次发射，因此显示出有限的灵敏度和选择性，因为单次发​​射很容易受到许多非分析因素的影响，而双次发射只能提供单比率发光检测。在这里，我们报告发白光的三基色MOF复合材料（W2）作为第一个多维比例发光探针。它轻便通过同时掺入红-绿发射铱和钌配合物阳离子作为包封的发光模块（榆树）到多孔蓝色发光MOF合成通过离子交换。特定的挥发性有机溶剂（VOS）可以引起W2中MOF到ELM的能量转移效率的VOS依赖性变化，而硝基芳香族（NAC）蒸汽以不同的速率引起了人们前所未有的兴趣，并以前所未有的方式淬灭了三种排放，这两种排放均可以实现可见光感应。每个VOS可以与发射峰高的两个MOF与ELM之比的唯一组合相关联，从而实现二维（2D）代码识别。此外，可以绘制出暴露于选择性NAC蒸气时这两个比率随时间的变化情况，从而实现了第一个3D代码识别。合成和传感策略均可进一步实施，以开发低成本，有效的发光探针。