sustained

Physics

Multicolor sustained luminescent material for dynamic optical anti-counterfeiting

Written by Light Publishing Center, Changchun Optical Research Institute, Precision Mechanical Physics, CAS (a) Normalized excitation wavelength-dependent PersL spectrum of CaGa1.97O4:0.5%Bi (irradiation time 5 min, interval 1 min). (b) Sustained decay monitored at the corresponding wavelength after 5 min of xenon lamp excitation from 240 to 440 nm. (c) Tunable PersL color trajectory recorded when changing the excitation wavelength from…