Functionalized Surfaces Created by Perturbation in Luminescent Polymer Nanocomposites: Materials for Forensic and Security Ink Applications

Europium ions doped pearl white dispersed effectively in PVA binder using Bovine Serum Albumin (BSA) as a stabilizer. Nano-powders (NPs) were synthesized by using propellant chemistry approach. Further, these NPs were incorporated into the polymer binder matrix by solvent casting approach to obtain nanocomposites (NCs). BSA stabilizer made any avenue for the perturbation to the secondary protein chains leading to functionalized surfaces. This helped in obtaining the uniform dispersion of the filler added. Different proportions of (2-10 wt%) functionalized BiOCl-Y2O3:Eu3 thorn NPs were loaded into PVA matrix. X-ray diffraction profile shows the effective incorporation of the NPs into the polymer. Upon exciting at 398 nm near UV light, the NC shows strong red emission at 612 nm along with other three peaks were due to the transition from 5D0 to 7Fj (j = 1, 2, 3 and 4). The highest PL intensity was registered for 8 wt% NPs in PVA matrix. The optimized NCPs were further utilized for various technological applications namely solid-state lighting, forensic and security ink preparation. The latent