摘要： Fingerprint identification technology has been widely utilized in the forensic field, given that the fingerprint is unique for each person and each finger and does not vary with age. In general, the fingerprints at a crime scene are latent and difficult to collect if the fingers were not contaminated with coloured materials, such as blood, ink or pigment. Moreover, the fingerprints on a smooth plane or transparent glass are hard to be visualized with traditional methods. In recent years, luminescent lanthanide-based nano-powder has been explored as a potential aid in fingerprint detection. Lanthanide based nano-materials have been analyzed because of the optical properties arising from the intra 4f transitions and of their relatively low toxicity. In principle, the technique allows the detection of latent finger-marks on a broad range of surfaces, like porous, semi-porous, non-porous and aged finger-marks. For the successful application of up-conversion phosphors in latent finger-marks detection, a phosphor should have good emission efficiency, uniform particle morphology, a dusty nature and stability against the humid environment. Y2Ti2O7 (YTO) belongs to the pyrochlore class and possesses peculiar thermodynamic and dynamic magnetic properties and has drawn researchers’ attention also for its upconversion emission properties or for ion-detection. In this work, we report the successful preparation of novel and non-toxic powder based on highly luminescent Er3+ and Er3+/Yb3+ codoped YTO nano-phosphors for fingerprint detection through solid- state method. To this aim, crystal structure, luminescence properties, morphology, and optimal doping concentrations have been investigated. Furthermore, the energy transfer processes between Er3+ and Yb3+ ion have been studied as a function of the concentration of Er3+ ions. Moreover, we used the optimized doped and co-doped YTO phosphors to detect fingerprints on the surface of different objects among which we chose several items commonly used in daily life, such as glass and plastic, where fingerprints are often left. The results reveal that the co-doped phosphors can efficiently manifest latent fingerprints with high contrast and low background interference, holding important application in fingerprint identification.