ABSTRACT Ambidextrous phosphor materials (performance intact in powder and dispersed condition) with large Stokes shift and excited state lifetime is highly preferable due to the stringent requirements of latent finger print (LFP) detectors and anti-counterfeiting markers. In this work, ZnS grafted Fe3O4 core shell luminomagnetic hybrid have been prepared via facile hydrothermal route. Interestingly, instead of pristine green emission of ZnS the prepared ambidextrous hybrid material (Fe3+:Fe3O4/ZnS) shows intense yellow emission under 350 nm UV exposure. Detailed experimental investigation supported by theoretical modelling and plausible energy band diagram demonstrates an inherent self-substitution mechanism of Zn2+ ions of ZnS shell by Fe3+ ions from the magnetite core which plays a decisive role in achieving the novel yellow emission. Maintaining superparamagnetic behavior in room temperature, the designed rare-earth (RE) free hybrid is employed as a proficient luminescent labelling agent for LFP detection (up to level III, stability up to 45 days) and anti-counterfeiting marker with higher accuracy compared to virgin ZnS.

中文翻译：

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黄色发光 Fe3O4/ZnS 杂化物：用于体外皮纹和防伪应用的探针

摘要 由于潜指纹 (LFP) 检测器和防伪标记的严格要求，具有大斯托克斯位移和激发态寿命的灵巧荧光材料（在粉末和分散条件下性能完好）是非常可取的。在这项工作中，ZnS 接枝的 Fe3O4 核壳光磁杂化物已通过简便的水热途径制备。有趣的是，所制备的灵巧混合材料 (Fe3+:Fe3O4/ZnS) 在 350 nm 紫外线照射下显示出强烈的黄色发射，而不是 ZnS 的原始绿色发射。由理论模型和合理能带图支持的详细实验研究表明，磁铁矿核中的 Fe3+ 离子对 ZnS 壳的 Zn2+ 离子具有固有的自置换机制，这在实现新型黄色发射中起决定性作用。