Downshifting and upconversion dual mode emission from lanthanide doped GdPO4 nanorods for unclonable anti-counterfeiting

Tricolor Upconversion Phosphors of LiYO2:RE3+/Yb3+ (RE = Tm, Ho, Eu) for Metamerism Anti‐Counterfeiting and 3D Volumetric Display

“…[ 1–7 ] Particularly benefitting from the sharp narrowband emissions, long‐lived excited states, non‐photobleaching, and low toxicity of rare‐earth (RE) activators, the RE‐doped phosphors effectively upconvert the incident near‐infrared (NIR) photons (invisible to the human eye) into robust visible photons, and show immense potential in the development of novel information security and multi‐level/mode anti‐counterfeiting. [ 8–13 ] Notably, the anti‐counterfeiting market is growing by more than $200 billion since 2021. [ 8 ] In recent years, multi‐mode optical anti‐counterfeiting has also been explored by innovatively regulating the versatile luminescence characteristics of new systems, such as quantum dots and optical glasses.…”

“…[ 8–13 ] Notably, the anti‐counterfeiting market is growing by more than $200 billion since 2021. [ 8 ] In recent years, multi‐mode optical anti‐counterfeiting has also been explored by innovatively regulating the versatile luminescence characteristics of new systems, such as quantum dots and optical glasses. [ 14–17 ] That is, to advance information security strategies and anti‐counterfeiting techniques is rather urgent and challenging.…”

Hydrothermal Synthesis, Structural Analysis and Photoluminescence Study of Nd3+/Ho3+ Doped Nanophosphors

“…By using an 808 nm laser to excite the sample, it is possible to analyse down-conversion, up-conversion, and energy transfer efficiency processes in detail. These nanomaterials' activated functional groups provide fascinating sensing properties that increase their potential use in a variety of applications, such as bio imaging, security, and optical and display systems [11][12][13][14] . Thus, our study adds to the growing body of knowledge on RE-based nanomaterials with customised dual-mode luminous characteristics.…”

Dual-mode luminescence anti-counterfeiting and white light emission of NaGdF4:Ce,Eu,Tb/carbon dot hydrophilic nanocomposite ink

“…With the continuous expansion of anti-counterfeiting demand, the anti-counterfeiting technology faces new opportunities and challenges. 1,2…”