Abstract

Real-time fluorescence of lanthanides for anti-counterfeiting purposes is susceptive to give interferences with the background and excitation light. In this context, background-free anti-counterfeiting technology is highly desired and developed [4,5]. Meanwhile, current anti-counterfeiting technologies face the challenges of low security and the inconvenience of being limited to visible light emission. A possible strategy is to develop NIR PersL materials or materials covering dual emitting wavelengths. In this study, we report a new PersL nanomaterial namely ZGSO:Ni²⁺,Cr³⁺,Er³⁺ NPs prepared by “top-down” method and its PersL covers well from the deep red toward NIR-II ranges. We have reported NIR-I Persist. Lum. of Cr³⁺ ions in bulk ZGSO ceramics corresponding to the ²E → ⁴A₂ (⁴F) transition [6], and were able to tune the optical properties of ZGSO by precisely controlling the crystal field by the use of Sn in these bulk materials.

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