Colour quality parameters and enhanced white light emanation via solution combustion derived MoO_3:Dy~(3+) micro-architectures: Fluorescent probe for sensitive visualization of latent fingerprints

摘要

Herein, we report a series of MoO3:Dy3+ (1-9 mol %) nanophosphors were synthesized by solution combustion route using barbituric acid as a fuel. The structural studies clearly show the orthorhombic phase of alpha-MoO3. Hierarchical microstructures were confirmed from scanning electron microscope. The optical band gap of the prepared nanophosphor was found to be in the range similar to 3.24-3.4 eV. The photoluminescence study revealed that the prepared samples emitted white light arising from the two dominant emission bands in the blue and yellow region corresponding to the F-4(9/2) - H-6(15/2) and F-4(9/2) - H-6(13/2) transitions under near ultraviolet excitation. The intensive photoluminescence emission was recorded for 5 mol % Dy3+ doped MoO3 nanophosphor. The latent fingerprints were visualized using optimized powder revealed type 1-3 ridge characteristics on many filtrating and non-filtrating surfaces upon normal light illumination. Based on the dominant white emission intensity under ultra-violet excitation, the prepared nanophosphors are expected to find potential applications in the production of white light for phosphor converted white light emitting diodes and advanced forensic applications.