Centella asiatica mediated solution combustion synthesis of a novel Pr3+ doped Lanthanum Oxyfluoride for display and visualization of latent fingerprints and anticounterfeiting applications

Abstract

Novel and highly effective red emitting phosphor Pr3+ doped (1–11 mol %) Lanthanum Oxyfluoride (LaOF) nanoparticles were synthesized as part of solid state white light emitting diodes by a low temperature solution combustion method using Centella asiatica leaf extract as a reducing agent. The structural and optical characterization of the nanophosphor is described. The nanophosphor shows a prominent emission in the red region. The concentration dependence of the Pr3+ luminescence is investigated. The Photoluminescence analysis, CIE and CCT coordinates suggest that phosphors derived from LaOF: Pr3+might a probable application for white LEDs. In addition, the effect of cation substitution on the strength of luminescence is further elucidated. The Judd-Ofelt theory was used to analyze various radiative properties. Finger Prints dusted by LaOF: Pr3+(5 mol %) NPs exhibit clear and bright images under UV 254 nm light and are helpful for identification of individuals.

Keywords

• Centella asiatica
• Oxyfluoride
• Judd-Ofelt
• Latent finger print
• Display