Doping concentration dependent photoluminescence and afterglow of Eu2+ doped CaAl2O4 for insight into the afterglow mechanisms

被引：9

作者：

Zhai, Bao-gai ^{[1
]}

Huang, Yuan Ming ^{[1
]}

机构：

[1] Changzhou Univ, Sch Microelect & Control Engn, Changzhou 213164, Peoples R China

来源：

PHYSICA B-CONDENSED MATTER | 2022年 / 646卷

基金：

中国国家自然科学基金;

关键词：

Calcium aluminate; Host sensitization; Photoluminescence; Afterglow; Luminescence center of afterglow; PERSISTENT LUMINESCENCE; ENERGY-TRANSFER; ALKALINE-EARTH; CRYSTAL-FIELD; COMBUSTION SYNTHESIS; LONG AFTERGLOW; PHOSPHOR; BLUE; EMISSION; CE3+;

D O I：

10.1016/j.physb.2022.414284

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Doping concentration dependent photoluminescence (PL) and afterglow of CaAl2O4:Eu2+ were investigated to clarify the afterglow mechanisms of CaAl2O4:Eu2+. The steady-state PL spectrum of CaAl2O4:Eu2+ is found to evolve with doping concentration. Contrarily, the afterglow spectrum of CaAl2O4:Eu2+ is broad in profile peaking at about 440 nm with the emission energy of the afterglow independent on doping concentration. Our results demonstrate that: (i) dopant Eu2+ works as a sensitizer to enhance the ultraviolet absorption of CaAl2O4; and (ii) the oxygen and calcium vacancies in CaAl2O4 are responsible for the PL and afterglow of CaAl2O4:Eu2+. Assuming oxygen and calcium vacancies as the luminescence center of afterglow, a model is presented. In addition to having disputed the general belief of Eu2+ acting as the luminescence center of afterglow for CaAl2O4: Eu2+, this model clears some ambiguities and resolves the puzzle on the doping concentration independent emission energy of the afterglow of CaAl2O4:Eu2+.

引用

页数：19

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