Abstract
Alkali metal ions (M+ = Na+, Li+, K+) co-doped ZnAl2O4:Eu3+ (5 mol%) (ZAE) nanopowders (NPs) were prepared via solution combustion route using Mimosa pudica (MP) leaves extract as a fuel. PXRD results of co-doped samples enhance the crystallinity and grain growth. Photoluminescence (PL) of the prepared ZAE and ZAE:M+ (M+ = Na+, Li+, K+) NPs shows intense emission peaks in the range of 550–750 nm and ascribed to 5D0 → 7FJ (J = 0–4) transitions of Eu3+ ions, respectively. A 2-fold enhancement in PL intensity was observed in Li+ co-doped samples. The optimized ZnAl2O4:Eu3+ (5 mol%), Li+ (1 wt%) (ZAEL) NPs were used to visualize LFPs on various porous, semi-porous and non-porous surfaces through robust powder dusting technique. The visualized latent fingerprints (LFPs) reveal well defined level 1–3 ridge characteristics under several tests such as fingerprint aging and fresh water treatment for various time durations. The obtained results clearly evidence that the prepared NPs are quite useful for multifunctional applications such as advanced forensic and solid state lightning.
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