Abstract
Due to the features of fingerprints, which include considerable diversity and invariability, latent fingerprint (LFP) detection has become a crucial part of criminal investigation. Its environmental friendliness, the powder dusting method is now preferred to visualize LFPs. Applicability of this method is severely constrained by substantial flaws like limited resolution, poor sensitivity, and significant background interference. By using the simple solution approach, we have presented BiOCl:Er3+ (1–9 mol %) phosphors to address these problems. An X-ray diffraction investigation verified the tetragonal structure of the BiOCl:Er3+. Transmission electron microscopy and high-resolution transmission electron microscopy studies are used to analyse the particle size and interplanar distances. Scanning electron microscopic images clearly revealed the layered structures with micron sized particles. Additionally, the optimized BiOCl:Er3+ (5 mol%) phosphor is used to detect LFP on diverse surfaces by utilising the powder dusting method. Under 365 nm light, phosphor displayed all the necessary characteristics for level I-III of LFP detection on a variety of surfaces. The pixel profile's fluctuating red value attests to the good affinity of BiOCl: Er3+ (5 mol%) phosphor for the fingerprint ridges. Additionally, it is possible to create writable inks by utilising the optimized phosphor such that hidden writings can be completed using a basic brush method and decoded under UV light illumination. The total findings demonstrated that the current phosphor is extremely capable for the production of LFP and anti-counterfeiting technologies.
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