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 devel-oped 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 signifi-cantly 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 an-tenna 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.