Abstract
Fingerprints have been effectively used in forensic surveys to identify individuals and provide information. The CaBi2(1−x)Nb2O9:2xEu3+ powders were successfully fabricated by a convenient solid-state reaction. The crystal structure, particle morphology, luminescent properties, thermal stability, and ridge-shape details were investigated comprehensively. The X-ray diffraction graphs indicated that the CaBi2(1−x)Nb2O9:2xEu3+ phosphors crystallized the orthorhombic phase. Photoluminescence emission spectra displayed an intense peak at 616 nm upon an excitation of 395 nm. The predominant concentration-quenching principle of Eu3+ followed the electric dipole–dipole interaction. The thermal-quenching temperature (T0.5) exceeded 420 K. Internal quantum efficiency (IQE) of the CaBi2Nb2O9:0.20Eu3+ sample reached 71.37%. The right whorl of latent fingerprint (LFP) was also observed clearly on substrates (aluminum foil, glass, and plastic) under a UV of 395 nm and sunlight illumination using optimized CaBi2Nb2O9:0.20Eu3+ samples. These results demonstrate that CaBi2(1−x)Nb2O9:2xEu3+ phosphors have fingerprint identification application prospects.
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