Annealing-assisted optimization for persistency of afterglow of SrAl2O4:Eu2+/Dy3+ microparticles for forensic detection

In the present work, Eu2+/Dy3+ ions doped/co-doped into persistent SrAl2O4 microparticles have been developed through solid-state synthesis followed by homogenization and particle size reduction in a ball milling device. These particles have shown a broad and long-persistent afterglow around the 528 nm wavelength of electromagnetic radiation through a broad excitation at around 400 nm. The luminescence intensity was optimized through the selection of different annealing temperatures in the range of 1100 C-degrees to 1500 C-degrees, with intervals of 100 C-degrees. Several structural and optical characterization techniques, such as XRD, SEM, FTIR, thermogravimetric analysis, and photoluminescence, were utilized to judge the preparation and ability of these particles in possible applications in latent fingermark detection on various difficult surfaces. The persistency and stability of these particles were calculated using a digital lux meter.

Automated summary

In this study, Eu2+/Dy3+ ions doped/co-doped into SrAl2O4 microparticles were synthesized through solid-state synthesis and ball milling. These particles exhibited a broad and long-persistent afterglow at the wavelength of 528 nm under broad excitation at around 400 nm. The luminescence intensity was optimized by selecting different annealing temperatures. Various characterization techniques were used to evaluate the preparation and application potential of these particles in latent fingermark detection. The persistence and stability of the particles were measured using a digital lux meter.