Nonstoichiometry-Induced Self-Activated Phosphors for Dynamic Anti-counterfeiting Applications

• DOI: 10.1021/acsami.4c04746
• Publication Date: 2024-06-14T16:09:40Z
• Authors: Yang Yue; Ting Wang; Yajing Yan; Longchao Guo; Xuanyu Zhu; Weifang Bu; Guohao Wang; Nannan Zhu; Lei Zhao; Xue Yu
• Keywords: Persistent luminescence; Ultraviolet

Optical signals with distinctive properties, such as contactless, fast response, and high identification, are harnessed to realize advanced anti-counterfeiting. However, the simultaneous attainment of multi-color, -temporal, -modal luminescence performance remains a compelling imperative pursuit. In our work, temperature/photon-responded dynamic self-activated originating from nonstoichiometric Zn2GeO4 is developed modulation intrinsic defects. The increased concentration oxygen vacancies (VO••) contributes an enhanced recombination ZnGe″–VO••, ultimately improving performance. Additionally, photoluminescence (PL) color representative Zn2.2GeO4 sample changes green blue–white ultraviolet (UV) irradiation time. Concurrently, emission undergoes variation blue ambient temperature raises 280 420 K. Remarkably, long persistent (LPL) photostimulated (PSL) behaviors observed. Herein, this study elucidates sophisticated anti-counterfeiting approach grounded in luminescent attributes Zn2GeO4, presenting promising frontier for evolution technologies.