Add time:07/21/2019         Source:sciencedirect.com

The article describes the properties of LuF3 and NaLuF4 fluorides doped with Yb3+ and Er3+ or Tm3+ ions, their comparison and application in latent fingermarks imaging. The single-phase materials were successfully synthesized by the hydrothermal method. They exhibited up-conversion (UC) phenomenon under excitation by the near-infrared (NIR) radiation at 975 nm. Under excitation, the energy transfer between Yb3+ and Er3+ or Tm3+ ions occurred and emissions in the visible range were recorded (green or blue for Er3+ or Tm3+ dopants respectively). The luminescence decays of as-prepared samples were measured allowing the calculation of luminescence lifetimes. The dependencies of integrated UC intensity on laser power density were measured for the obtained samples, revealing up to three-photon process for Yb3+ and Tm3+ co-doped and two-photon process for Yb3+ and Er3+ co-doped materials. Furthermore, up-converting lutetium fluorides synthesized in this report were successfully used to visualize latent fingermarks on various non-porous surfaces.

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