Electrical stimulation for brighter persistent luminescenceOACSTPCD

An immature understanding of the mechanisms of persistent luminescence(PersL)has hindered the development of new persistent luminescent materials(PersLMs)with increased brightness.In this regard,in-situ direct current(DC)electric field measurements were conducted on a layered structure composed of the SrAl2O4:Eu2+,Dy3+phosphor,and an electrode.In this study,the photoluminescence(PL)and afterglow properties were investigated with respect to voltage by analyzing the current signal and thermoluminescence(TL)spectroscopy.The intensity of PersL increased due to a novel phenomenon known as"external electric field stimulated enhancement of initial brightness of afterglow".This dynamic process was illustrated via the use of a rate equation approach,where the electrons trapped by the ultra-shallow trap at 0.022 eV could be transferred through the conduction band during long afterglow.The afterglow intensity could reach 0.538 cd m-2 at a 6V electric voltage.The design of an electric field stimulation technique enables the enhancement of the intensity of PersLMs and provides a new perspective for exploring the fundamental mechanics of certain established PersLMs.