Hydrothermal and anion exchange synthesis of Mn(V)-doped Ba(PO)Cl nano-apatite toward NIR-II temperature sensing.

The second near-infrared window (NIR-II) in the range of 1000-1400 nm is ideal for imaging and sensing through reduced scattering, absorption, and autofluorescence. However, there are only a few nanophosphor systems with emission in the NIR-II region. Here, we report on Mn-doped Ba(PO)Cl nanoparticles (BPCl:Mn NPs, < 50 nm) toward NIR-II temperature sensing.