荧光粉
光致发光
材料科学
丝网印刷
荧光
纳米颗粒
兴奋剂
表征(材料科学)
纳米技术
聚丙烯酸
带隙
紫外线
化学工程
发光
离子
光电子学
聚合物
化学
光学
有机化学
复合材料
工程类
物理
作者
Jiao Wu,Quanxiao Liu,Peng Gao,Jiaqi Hu,Meijuan Cao,Junying Zhang,Wei Chen,Jigang Wang,Yuansheng Qi,Zhenjun Li
出处
期刊:Coatings
[MDPI AG]
日期:2023-07-14
卷期号:13 (7): 1247-1247
标识
DOI:10.3390/coatings13071247
摘要
Herein, a series of Ba0.5Sr0.5Al2O4: xEu2+ (x = 0.01, 0.02, 0.03, 0.04, 0.06) nanophosphors were synthesized by a combustion method. The investigation encompassed the characterization of the phase purity, morphology, elemental composition, and photoluminescence behavior of Ba0.5Sr0.5Al2O4: xEu2+ nanoparticles. Under excitation by 303 nm and 365 nm ultraviolet light, the nanoparticles exhibited blue-green emission arising from the 4f65d→4f7 transition of Eu2+ ions. The optimal doping concentration was determined to be 2%. Notably, the nanoparticles demonstrated fluorescence lifetimes and quantum yields of 1010 ns (λex = 303 nm), 112 ns (λex = 365 nm), 10.5%, and 10.3%, respectively. Additionally, a comprehensive analysis of the band structure and electronic density of states was conducted, revealing a theoretical direct band gap of 4.05 eV for the Ba0.5Sr0.5Al2O4 host. In addition, the prepared fluorescent powder can be used to prepare fluorescent flexible films. This film does not change the characteristic emission of Eu2+ ions and has more stable physicochemical properties, which may be more suitable for use in harsh environments. Also, the fluorescent powder can be blended with polyacrylic acid to form colorless anti-counterfeiting ink that can be applied to banknotes as an anti-counterfeiting mark. A clover pattern was successfully printed using screen-printing technology, proving its potential application in the field of anti-counterfeiting.
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