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.…”

Optimizing the luminescence efficiency of an europium (Eu3+) doped SrY2O4 phosphor for flexible display and lighting applications

“…With the excitation of 254 nm (UV region), europium ions are useful for light emitting phosphor and exible display applications. [24][25][26][27][28][29][30][31][32][33][34][35][36] In this paper, we describe how to easily make new Eu 3+ doped SrY 2 O 4 phosphors, which may be utilized to improve the attractive performance of intelligent (smart) materials for exible displaying applications. SYO:Eu phosphors emit red light when exposed to UV radiation.…”

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 anticounterfeiting technology faces new opportunities and challenges. 1,2 Because of the excellent physical and chemical properties such as low phonon energy, high chemical stability and easy modication of surface structure, rare earth-doped uoride has attracted much attention in the eld of luminescent anti-counterfeiting materials. [3][4][5] Hu et al prepared multicolor luminescent NaGdF 4 nanocrystals based on Ce/Yb/Ho triple doping with temperature responses.…”

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