A multicolor persistent luminescent phosphor Sr <sub>2</sub> Ga <sub>2</sub> GeO <sub>7</sub> :Pr <sup>3+</sup> for dynamic anticounterfeiting

Liping Ji(Lanzhou University), Jinyu Zhou(Lanzhou University), Jiachi Zhang(Lanzhou University), Zhiya Zhang(Lanzhou University), Zhidong Ma(Lanzhou University), Wenxiang Wang(Lanzhou University), Huihui Li(Lanzhou University), Chunfang Wu(Lanzhou University)
Journal of the American Ceramic Society
March 18, 2019
10.1111/jace.16432
Cited by 63

Abstract

Abstract Persistent luminescence (PersL) phosphor is a glow‐in‐the‐dark material that has been widely applied. Here, we report a multicolor PersL phosphor Sr 2 Ga 2 GeO 7 :Pr 3+ . The PersL color can be tuned from deep red to blue. It reveals that the luminescent color modulation of the Sr 2 Ga 2 GeO 7 :Pr 3+ phosphor is essentially associated with the cross‐relaxation effect of Pr 3+ in the host with low‐phonon assistance energy. The PersL lifetime of the multicolor phosphors can be also tuned. Based on the unique features of Sr 2 Ga 2 GeO 7 :Pr 3+ phosphor, some simple PersL images are fabricated to emit dynamic multicolor information, and it shows that the PersL image even depicts dynamic multicolor anticounterfeiting.

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