Strong upconverting and downshifting emission of Mn2+ ions in a Yb,Tm:NaYF4@NaLuF4/Mn:CsPbCl3 core/shell heterostructure towards dual-model anti-counterfeiting

A Yb,Tm:NaYF₄@NaLuF₄/Mn:CsPbCl₃ quasi-core/shell heterostructure is synthesized with the assistance of silica. The strong upconverting and downshifting emission of Mn²⁺ ions was observed in the nanocomposite with a quasi-core/shell structure.