Thermoluminescence and Temperature‐Dependent Afterglow Properties in BaSi₂O₂N₂:Eu²⁺

Abstract

BaSi2O2N2:Eu2+ phosphor was successfully synthesized by using a simple solid‐state reaction method. Its properties were systematically investigated utilizing XRD, photoluminescence, excited state decay curve, afterglow emission spectra, and thermoluminescence (TL) glow curve. With increasing temperature, its emission intensity decreases with the broadening full widths at half maximum. Particularly, its temperature‐dependent afterglow emission spectra were investigated for the first time. Based on the information from TL glow curve, temperature‐dependent afterglow decay curves, and afterglow emission spectra, a model was constructed to explain the mechanism of afterglow. This study provides a new perspective to use the temperature‐dependent luminescence properties for studying the afterglow processes of long‐lasting phosphorescence phosphors.

Atomic layer deposition (ALD) of nanoscale coatings on SrAl2O4‐based phosphor powders to prevent aqueous degradation

“…These two decay lifetimes represent an initial rapid decay corresponding to the intrinsic lifetime of Eu 2+ followed by the long and slower decay of the afterglow due to the deep trap energy center of codopant Dy 3+ . The multi‐exponential afterglow decay model of this phosphor is fully in agreement with the behavior of a wide variety of rare‐earth‐ion‐doped long‐persistent phosphors …”

Synthesis and Persistent Luminescence Mechanism of a Novel Orange Emitting Persistent Phosphor Sr5(BO3)3Cl:Eu2+

“…With the incorporation of Eu 2+ ions into the host lattice, the two predominated traps may be completely changed. The Sr 2+ vacancies () are also entirely possible to be created in the high‐temperature reaction process . It in turn helps to promote the generation of .…”

Persistent luminescence in nitride and oxynitride phosphors: A review

“…The thermoluminescence glow peaks of the MSi 2 O 2 N 2 :Eu phosphors are not straightforwardly interpretable, as they contain multiple, often overlapping peaks [37,38,40,42]. For BaSi 2 O 2 N 2 :Eu, the main TL glow peak lies at relatively low temperature (335K for a heating rate of 1.4K/s [41], 360K at 5K/s [37]), along with a less prominent deep trap at around 420K [37,41].…”

“…Cation vacancies were suggested as hole traps [38,40], although it is not clear why hole trapping would occur, if the same mechanism as in Eudoped aluminates (Eu 2+ -> Eu 3+ + trapped electron) is at play [20]. X-ray absorption measurements indicate the simultaneous presence of Eu 2+ and Eu 3+ in BaSi 2 O 2 N 2 :Eu (Fig.…”