Highly flexible dual-mode anti-counterfeiting designs based on tunable multi-band emissions and afterglow from chromium-doped aluminates

Abstract

Fluorescent materials generally show diverse light-emitting, simple manufacturing processes, long service life, long-term reliability properties, gradually become a hotspot in the field of anti-counterfeiting. The phosphors with multi-function for the...

A dynamic irradiation-responsive material for advanced anti-counterfeiting in dark and bright fields

“…[1][2][3] For enterprises, if they do not pay attention to the anti-counterfeiting of products, it may also bring huge business losses. [4][5][6] Among the current anti-counterfeiting technologies, luminescence is widely regarded as one of the most ideal anti-counterfeiting technologies due to its good visibility, easy design, and the popularity of portable lamps as irradiation sources. [7][8][9] Generally, the basic feature of luminescence anticounterfeiting is that the anti-counterfeiting label is invisible in sunlight and only appears in the form of luminescence under irradiation of ultraviolet light.…”

High-level information encryption based on optical nanomaterials with multi-mode luminescence and dual-mode reading

“…[1][2][3] Along with the development of optical materials, diverse luminescent materials, such as those that exhibit down-conversion luminescence (DCL), 4 up-conversion luminescence (UCL), 5 and per-sistent luminescence (PersL), [6][7][8][9] have been developed and have found application in the field of information security. [10][11][12][13][14][15][16][17][18] However, a single luminescence mode is usually insufficient to meet the demands of high-level information security and is easily imitated. 19,20 To improve the security of anti-counterfeiting applications, various luminescent materials with dual-or multi-luminescence modes, in which light of different colors is emitted upon excitation with different types of stimulation, have been developed.…”

Structural and luminescence studies of titanium co‐doped SrY2O4:Eu phosphors

“…With co‐doping, the intensity increased and longer persistence luminescence was observed. Yang et al [ 19 ] studied the effect of Ti 4+ co‐doping on Cr 3+ ‐doped MAl 12 O 19 (M = Ca, Sr). The intensity of luminescence was enhanced dramatically with the addition of co‐dopant.…”

“…With co-doping, the intensity increased and longer persistence luminescence was observed. Yang et al [19] studied the effect of Ti 4+ co-doping on Cr 3+ -doped MAl 12 O 19 (M = Ca, Sr).…”