The trap bag concept of afterglow luminescence

Abstract

This article explains the behavior of afterglow luminescence using the trap bag concept, in which a constant phosphor dose contains a presumed bag with the ability to capture or release electrons through its opening. Luminescence is emitted as the bag releases the captured electrons. The electron-holding capacity is determined by the irradiation conditions, the width of the opening, and the electron activation; these factors are inherent properties of the long persistent luminescence (PLUM) dose and are affected by the thermal status. During the afterglow stage, higher temperatures may result in a wider opening and increased activation of electrons released from the bag, thus creating a higher light intensity and leading to the quicker exhaustion of the electrons within. In contrast, the opposite phenomenon will occur at lower temperatures. This article provides a detailed explanation of the trap bag concept at various thermal statuses and provides a method for delaying the afterglow peak profile through temperature change. Experimental tests were performed to confirm the proposed concept.

Effect of the Concentration of SrAl2O4: Eu2+and Dy3+ (SAO) on Characteristics and Properties of Environment-Friendly Long-Persistent Luminescence Composites from Polylactic Acid and SAO

“…The effects of SAO content on the microstructure, thermal, tensile, and afterglow properties of SAO/PLA composite were investigated in detail. To enhance the behavior of these composites, SAO particles were treated with a 3-aminopropyltriethoxysilane (APS) coupling agent [12]. The treated SAO particles were then doped at 5, 10, 15, and 20 wt% in a copolymer solution (polyethylene glycol was added to increase the compatibilization of SAO in the PLA matrix).…”

Novel cementitious materials with mechanoluminescence for the application of visible stress monitoring and recording

“…The above results indicate that there are three kinds of luminescent model in the specimen: (I) PL; (II) PSL and (III) ML, the mechanism of each model is different 28 , 39 , 40 . As shown in Fig.…”

Enhanced yellow afterglow in Ca2SnO4:Dy3+ by co-doping Na+/K+

“…Two positive defects of electrons captured by DyCa* and a negative vacancy of VCa will be produced due to each substitution by two Dy 3+ ions . 24,25 The doping of Dy 3+ will produce deeper traps and determine the aerglow in the later stage. In addition, the introduction of basic ions M + (K + , Na + ) can deepen the traps and increase the trap density, thus capturing more electrons and producing longer and stronger aerglow.…”