Constructing perovskite-like oxide CsCa2Ta3O10: Yb, Er@Cs(PbxMn1-x)(ClyBr1-y)3 perovskite halide composites for five-dimensional anti-counterfeiting barcodes applications

Formation mechanisms of CsPbBr3/Cs4PbBr6 microscale composites assisted with imidazolium cations and their device applications

“…All-inorganic halide perovskite NCs, CsPbX 3 , where X represents halogen Cl, Br, or I, have drawn tremendous attention recently on account of their excellent electronic and optical properties, which include high carrier mobility, high photoluminescence (PL) quantum yields (QYs), and narrow and tunable emission. 1,2 The above merits make them promising candidates for many applications, such as light-emitting diodes (LEDs), [3][4][5][6] solar cells, 7,8 lasers, 9 scintillation detectors, 10 multiplexing codes, [11][12][13] and so on. [14][15][16] On the other hand, their poor stability against heat, light, and moisture still remains the main obstacle to practical applications.…”

Luminescence Enhancement of Mn4+-Activated Fluorides via a Heterovalent Co-Doping Strategy for Monochromatic Multiplexing

“…Optical multiplexing based on time-resolved luminescent materials plays a significant role in information security. , Hitherto, a series of potential materials for information storage, anti-counterfeiting, and encryption have been designed, such as the lanthanide-doped upconversion nanoparticles, Mn 2+ -doped upconversion materials, inorganic perovskite quantum dots (QDs), carbon quantum dots (CQDs), and inorganic–organic hybrid composites. − However, the reported security materials still cannot meet the ever-increasing requirements of both decoding efficiency and high-level security . For example, the multiplexing in nanosecond temporal domains needs costly time-gated instrumentation and a tedious data-decoding process, which poses a considerable constraint for practical use.…”

Highly bright carbon quantum dots for flexible anti-counterfeiting

“…Colloidal carbon quantum dots (C-dots) have been widely used as advanced optical materials for various types of applications, including solar energy conversion, [1][2][3][4] biosensor/imaging, [5][6][7] and information encryption/anti-counterfeiting. [8][9][10][11] Besides quick response technology, 12 radio-frequency identification technology, 13,14 and barcode technology, 15 optical anti-counterfeiting technology 16,17 has attracted widespread attention due to the advantages of a high anti-counterfeiting capability and easy operation. 18,19 However, it is still a big challenge to make a reliable fluorescent anticounterfeiting materials with cost-effectiveness and environmental friendliness and that, could not easily be mimicked or forged.…”