High-contrast multi-surface imaging of latent fingerprints using color-tunable YOF:Tb 3+ ,Eu 3+ ultrafine nanophosphors with high quantum yield

ratio demonstrated multicolor fluorescence emission from the nanophosphors, which provided better contrast between the ridge patterns on complex surfaces. Furthermore, the high luminescence quantum yield of the nanophosphors ensured high-resolution fluorescence images of the LFPs with a well-defined pattern that was recognizable even without any microscope or sophisticated instrumentation.