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增强SrAl2O4的光特性:Eu2+,Dy3+通过协同兴奋剂Gd3+和防伪应用
Peng Gao1, Quanxiao Liu1, Jiao Wu1
1Beijing Key Laboratory of Printing and Packaging Materials and Technology, Beijing Institute of Graphic Communication, Beijing 102600, China.
Nanomaterials (Basel, Switzerland)
|July 29, 2023
概括
用Dy3+和Gd3+传感器合成长时间后发光的发光材料 (SrAl2O4:Eu2+). 兴奋剂增强了发光强度和后光持续时间,显示了反假冒应用的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 发光的光度是非常的低.
背景情况:
- 长时间后发光的发光材料对于各种应用至关重要,包括安全标志和防伪.
- 与欧 (Eu2+) 合的氧化 (SrAl2O4) 是一个众所周知的持久,但它的性能可以进一步优化.
研究的目的:
- 为了合成和表征基于SrAl2O4:Eu2+合 (Dy3+) 和加多 (Gd3+) 的新型长光后发光材料.
- 为了研究Dy3+和Gd3+共兴奋剂对光发性质的影响,包括强度和后照持续时间.
- 通过丝网印刷探索这些材料在防伪应用中的潜力.
主要方法:
- 使用燃烧合成方法制备了SrAl2O4:Eu2+ (SAOE),SrAl2O4:Eu2+,Dy3+ (SAOED) 和SrAl2O4:Eu2+,Dy3+,Gd3+ (SAOEDG) 的.
- 使用X射线衍射 (XRD) 和X射线光电子光谱 (XPS) 来分析晶体结构和元素组成.
- 光发光 (PL) 光谱和光后衰减曲线被用来评估发光性质.
- 扫描电子显微镜 (SEM) 和能量分散式X射线光谱 (EDX) 描述了形态和元素分布.
主要成果:
- 添加Dy3+和Gd3+离子并没有改变SrAl2O4:Eu2+的晶体结构或排放峰值位置.
- Eu2+的注导致了以508nm为中心的绿色辐射,这归因于其4f65d1 → 4f7电子过渡.
- 与Dy3+和Gd3+的联合兴奋剂显著提高了发光强度,并通过创建电子陷中心,延长了后光持续时间.
- 成功合成得到证实,具有可控制的离子度,并在屏幕印刷油墨中成功应用,用于防伪.
结论:
- Dy3+和Gd3+在SrAl2O4:Eu2+中起到有效的敏感剂作用,改善长时间后发光特性.
- 合成的材料对先进的防伪技术具有有前途的特性.
- 和墨水的组合为安全的印刷应用提供了一种新的方法.
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