A Highly Sensitive Luminescent Upconversion Nanosensor for Turn-On Detection of As.

A luminescent nanoprobe (N), MnO-modified Er/Yb-codoped AgMoO upconversion nanoparticles (UCNPs; cod-AMO-3/MnO), was constructed for rapid, sensitive, and selective "turn-on" detection of trace As. Herein, two kinds of luminescent Ns were developed based on luminescence resonance energy transfer (LRET) between cod-AMO-3 as the energy donor and MnO as the energy acceptor. By using MnO as the matrix in cod-AMO-3/MnO fluorometric assay, the upconversion luminescence (UCL) intensity () of the cod-AMO-3 probe was quenched significantly through LRET, illustrating MnO as an efficient quencher for UCL.