Halide perovskite nanocrystals and lanthanide complex-based bi-luminescent security ink for multilevel static-dynamic anticounterfeiting. (November 2022)

• Record Type: Journal Article
• Authors: Dubey, Charu; Shruti, ; Singh, Sunil Kumar; Singh, Akhilesh Kumar
• Is Part Of: Materials research bulletin. Volume 155(2022)
• Publication Date: 2022-11
• Subjects: Bi-luminescent security ink -- Anticounterfeiting -- Photoluminescence -- Lanthanide -- Halide perovskite; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2022.111977
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: Bi-luminescent security ink comprising Eu(TTA)3 Phen and CsPbBr3 nanocrystals has been developed that offers multilevel anti-counterfeiting strategies. Under UV excitation, the bi-luminescent security ink shows intense red emission, whereas it emits green emission under blue light excitation, promising for multi-stimuli anti-counterfeiting. This ink can also be used for dynamic anti-counterfeiting under a single excitation wavelength. Bi-luminescent security ink is very stable under UV light, different chemical environments, and ambient environments. Abstract: Counterfeiting is of great concern globally and requires technological research and development for high-security encryption. In this work, we have developed a bi-luminescent security ink comprising Eu(TTA)3 Phen and CsPbBr3 nanocrystals which offers multilevel anti-counterfeiting strategies. Under UV excitation, the bi-luminescent security ink shows intense red emission, whereas it emits green emission under blue light excitation. As the red transition of Eu 3+ ions show a lifetime of the order of microseconds and the green band of CsPbBr3 nanocrystals of the order of nanoseconds, the ink can also be used for dynamic anticounterfeiting under a single excitation wavelength. We have successfully demonstrated the multi-stimuli anticounterfeiting application of the developed bi-luminescent security ink. The dynamic anticounterfeiting aspect has been demonstrated by making use of the phosphorescence spectrum of the printed patterns. Our results show that the developed bi-luminescent security ink is very stable under UV light, different chemical environments, and ambient environments. Graphical abstract: Image, graphical abstract