Traps study of Ca2BO3Cl: Eu2+ Dy3+ long-persistent phosphor by electron paramagnetic resonance

Abstract

Trap types of the yellow emitting long-persistent phosphor Ca2BO3Cl: [Formula: see text], [Formula: see text] were analyzed in this study. [Formula: see text] acting as luminescent centers produced a broad emission band located at 580[Formula: see text]nm, which ascribes to the 5d-4f transitions. Four kinds of traps in this afterglow phosphor were detected by thermoluminescence spectra. Electron paramagnetic resonance spectroscopy, which is a considerable testing method, was used to identify the traps caused by different reasons. Based on it, detailed processes and traps analyses were examined and discussed.