Study on the Show Potential Handprint of SrAl2O4:Eu2+,Dy3+ Fluorescent Suspensions Coated with Silica-aluminum Binary Films
The surfaces of SrAl2O4:Eu2+,Dy3+ were coated with silicon film and aluminum film by sol-gel method.Silicon-aluminum binary film coated with SrAl2O4:Eu2+,Dy3+ fluorescent powder was prepared into a small particle suspension,and applied to the appearance of potential handprint on the surface of difficult and complex objects.The study shows that the silicon-aluminum binary film coated with SrAl2O4:Eu2+,Dy3+ fluorescent suspension can emit bright green fluorescence under 365 nm ultraviolet light,with clear and coherent handprints and obvious detailed features,and after removing the light,it can continue to emit light and eliminate object background color interference.The suspension has a good appearance effect on potential handprint on the surface of common permeable object,non-permeable object,old handprint and water impregnated object,especially for the object with complex background color and autofluorescence,and its long afterglow characteristics can realize the handprint appearance without background.
long afterglow characteristicscoatingfluorescent suspensionpotential handprintappearance without background
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