External-field-dependent tunable emissions of Er3+-In3+ Co-doped Cs2AgBiCl6 for applications in anti-counterfeiting

Lanthanide-doped Na2MgScF7 exhibiting downshifting and upconversion emissions for multicolor anti-counterfeiting

“…The highly distinguishable patterns under different excitation denote the potential application in multicolor anti-counterfeiting. Moreover, compared with some other reported luminescent materials capable of both DS and UC emissions for anti-counterfeiting, 55–58 the presented NMSF-based phosphors should be more efficient in the UC emissions, because of the low phonon energy and efficient ETU processes, and four ionic combinations of UC have been realized in NMSF.…”

Temperature-Dependent Double Exciton Competition Emission in One Dimensional Copper-Based Organic–Inorganic Hybrid Perovskites

“…Metal halide perovskites have promising application prospects in optoelectronic devices, for instance, solar cells, , scintillators, lasers, , anticounterfeiting devices, − light-emitting diodes (LEDs), and photodetectors, − due to their excellent optoelectronic properties, high absorption coefficients, high carrier mobility, and high photoluminescence quantum yields (PLQYs). Lead-based perovskites APbX 3 (A = MA + , FA + , Cs + ..., X – = Cl – , Br – , I – ) have been extensively researched due to their excellent photovoltaic properties, in particular, good emission characteristics and high PLQYs. − Although lead-based perovskites possess excellent optoelectronic properties, due to their weak stability their practical applications are limited.…”

Multiple Light Source-Excited Organic Manganese Halides for Water-Jet Rewritable Luminescent Paper and Anti-Counterfeiting

“…Nowadays, although modern electronic technology has changed the way of information storage and communication in this digital age, paper remains the most important printing material in our daily lives and the total consumption is still persistently increasing every year. − However, most of the printed papers are directly disposed after only one-time reading in a short time, which results in a serious energy consumption and environment problem, such as solid waste and chemical pollution. , Unfortunately, the printed information on paper is easily copied and counterfeited, leading to information leakage in various important fields including military, economics, and technology and in our daily life. , Information security has become an important international concern, and severe information leakage would result in unimaginable consequences, such as copyright dispute, economic conflict, and even international war. , Although substantial anti-counterfeiting technologies, such as luminescence anti-fake method, have been explored, the conventional luminescent materials still have some serious drawbacks including low emission efficiency and intensity contrast and so forth. , To overcome these environmental, economic, and security issues, rewritable paper is progressively developed as an excellent candidate, which possesses high repeatability of realizing the write–erase–write cycle and concealment of information, avoiding information leakage and forgery. − …”

“…9,10 Although substantial anti-counterfeiting technologies, such as luminescence anti-fake method, have been explored, the conventional luminescent materials still have some serious drawbacks including low emission efficiency and intensity contrast and so forth. 11,12 To overcome these environmental, economic, and security issues, rewritable paper is progressively developed as an excellent candidate, which possesses high repeatability of realizing the write−erase−write cycle and concealment of information, avoiding information leakage and forgery. 13−15 In the past several decades, substantial research work has been done to develop versatile chromogenic materials to fabricate recycled paper.…”