Luminescence concentration quenching exists widely in lanthanide-doped luminescent nanomaterials, and significantly hinders their emission intensity. In this work, we report the concentration-quenching-free properties of the 406 nm emission in Pr 3+ -doped nanoscintillators, which is attributed to the large energy gap between the 1 S 0 and 1 I 6 states (Δ E = ∼25 000 cm -1 ) of Pr 3+ ions, preventing the concentration quenching effects caused by both cross-relaxation and energy migration to surface quenchers. This work provides further understanding about the concentration quenching effect of lanthanide-doped luminescent nanomaterials and a new perspective for avoiding detrimental concentration quenching. In addition, we also demonstrate the potential use of Pr 3+ -doped nanoscintillators as anti-counterfeiting materials.