Dynamic readout of optical information based on the color-tunable emitting electron-trapping material BaAl₁₂O₁₉:Eu²⁺ toward high security level optical data storage and anticounterfeiting

Abstract

Dynamic readout of optical information based on color tunable TSL is realized.

Investigation on the luminescence properties and mechanism of a novel Pr3+-based red persistent luminescence phosphor Cd3Ga2Ge3O12:Pr3+

“…As we all know, PersL properties are usually dependent on the thermally-stimulated gradual release of charge carriers. 43,44 And the depth of the traps and concentration of the carriers is related to the PersL properties. To further explore the effect of doped Pr 3+ in CGGO on the luminescence process, TL measurements were investigated after irradiation by a UV lamp for 5 min at room temperature.…”

Multimode Dynamic Photoluminescence of Bi3+-Activated ZnGa2O4 for Optical Information Encryption

“…A dynamic optical anticounterfeiting technique used for information recording and reading is preferentially designed with tunable fluorescence in response to external stimuli such as irradiation time, ion doping, excitation wavelength, and temperature. − Specifically, time-evolving dynamic multicolor PL luminescence significantly improves the confidentiality of information security because of its difficult-to-imitate character. Recently, an advanced dynamic optical anticounterfeiting strategy has been developed by capitalizing on time-evolving luminescent conversion for information encryption.…”

Tailor Traps in Bi3+-Doped NaGdGeO4 Phosphors by Introducing Eu3+ Ions to Switch Multimodal Phosphorescence Emission

“…Fluorescence materials, due to their high photoluminescence (PL) intensity/efficiency and tunable excitation/emission wavelength, are widely used in the fields of banknotes, artworks, documents, and even personal information security. − So far, many materials such as metal–organic frames and organic luminescent, perovskite luminescent, , and lanthanide-doped inorganic luminescence materials have been used in anti-counterfeiting. Among these, lanthanide-doped inorganic luminescent materials due to their color-tunable, simple recognition, and good photochemical stability are considered the most competitive anti-counterfeiting materials. − PL, up-conversion luminescence (UCL), mechanoluminescence (ML), and long persistent luminescence (LPL) are four quintessential modes for anti-counterfeiting and information security. − However, these four fluorescent coding modes generally show monochromatic, static, and single-modal luminescence, leading to unchangeable and single-level anti-counterfeiting. , Development of advanced anti-counterfeiting technologies (which are difficult to copy and easy to authenticate) is the primary approach for resisting the increasing sophistication of counterfeiting …”