Fast and sensitive detection of dilute rare earth species still represents a challenge for an on-site survey of new resources and evaluation of the economic value. In this work, a robust and low-cost protocol has been developed to analyze the concentration of rare earth ions using a smartphone camera. The success of this protocol relies on mesoporous silica nanoparticles (MSNs) with large-area negatively charged surfaces, on which the rare earth cations (e.g., Eu³⁺) are efficiently adsorbed through electrostatic attraction to enable a “concentrating effect”. The initial adsorption rate is as fast as 4025 mg (g min)^-1, and the adsorption capacity of Eu³⁺ ions in the MSNs is as high as 4730 mg g^-1 (equivalent to ~41.2 M) at 70 °C. The concentrated Eu³⁺ ions in the MSNs can form a complex with a light sensitizer of 1,10-phenanthroline to significantly enhance the characteristic red emission of Eu³⁺ ions due to an “antenna effect” that relies on the efficient energy transfer from the light sensitizer to the Eu³⁺ ions. The positive synergy of “concentrating effect” and “antenna effect” in the MSNs enables the analysis of rare earth ions in a wide dynamic range and with a detection limit down to ~80 nM even using a smartphone camera. Our results highlight the promise of the protocol in fieldwork for exploring valuable rare earth resources. 

快速，灵敏地检测稀稀土物种仍然是对新资源进行现场调查和评估经济价值的挑战。在这项工作中，已经开发了一种健壮且低成本的协议，可以使用智能手机相机分析稀土离子的浓度。该协议的成功取决于具有大面积带负电表面的中孔二氧化硅纳米粒子（MSN），稀土阳离子（例如Eu ³⁺）通过静电吸引有效地吸附在其上，从而实现“浓缩效应”。初始吸附速率高达4025 mg（g min）^-1，而MS 3s中Eu ³⁺离子的吸附容量高达4730 mg g ^-1。（相当于〜41.2 M）在70°C下进行。MSN中浓缩的Eu ³⁺离子可与1,10-菲咯啉光敏剂形成络合物，从而显着增强Eu ³⁺离子的特征性红色发射，这归因于“天线效应”，它依赖于有效的能量转移。对Eu ³⁺离子的光敏剂。MSN中“集中效应”和“天线效应”的正协同作用使人们能够在宽动态范围内分析稀土离子，即使使用智能手机相机，其检测限也可低至约80 nM。我们的结果突出了该协议在野外工作中探索有价值的稀土资源的希望。