Regulating Mn2+/Mn4+ Activators in ZnGa2O4 via Mg2+/Ge4+ Doping to Generate Multimode Luminescence for Advanced Anti-Counterfeiting

被引:59
作者
Si, Te [1 ]
Zhu, Qi [1 ]
Xiahou, Junqing [1 ]
Sun, Xudong [2 ]
Li, Ji-Guang [3 ]
机构
[1] Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Liaoning, Peoples R China
[2] Foshan Grad Sch Northeastern Univ, Foshan 528311, Peoples R China
[3] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050044, Japan
基金
中国国家自然科学基金;
关键词
ZnGa2O4; Mn4+; luminescence; self-reduction; anti-counterfeiting; RED PHOSPHOR; EMISSION; COLOR; MN4+; REDUCTION; CENTERS; CR3+; MN2+; OCCUPATION; IONS;
D O I
10.1021/acsaelm.0c01121
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Traditional fluorescent anti-counterfeiting materials usually display monochromatic luminescence at a fixed excitation mode, which greatly reduces the efficiency of anti-counterfeiting applications. Recently, developing a multilevel anti-counterfeiting material with tunable photoluminescence is a hot topic in the arena of advanced anti-counterfeit research. Here, spinel- structured solid solutions of ZnGa2-x(Mg/Ge)(x)O4:0.001Mn (x = 0-1.2) have been successfully synthesized by a high-temperature solid-state reaction. In this solid solution, Mn2+ and Mn4+ ions were substituted for the tetrahedral site (Zn site) and the octahedral site (Ga site), respectively, which emitted a green light at similar to 505 nm with afterglow and a red light at similar to 668 nm with the absence of afterglow. The Mn2+ and Mn4+ luminescent centers in ZnGa2O4 were effectively regulated by the incorporation of Mg2+/Ge4+, which resulted in more Mg2+ ions occupying the Zn site and thus leading to more Mn4+ ions in the Ga site and less Mn2+ ions in the Zn site. Therefore, doping Mg2+/Ge4+ contributed to a greatly enhanced red emission for Mn4+ ions at similar to 668 nm and a weakened green emission for Mn2+ ions at similar to 505 nm. The luminescent materials prepared in this study show dynamic and multicolor changes and a higher anti-counterfeiting security, indicating that they have potential for use in advanced luminescent anti-counterfeit materials. The research results in this work provide guidance for the development of multimode luminescent materials in anti-counterfeiting applications.
引用
收藏
页码:2005 / 2016
页数:12
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