Enhanced afterglow performance of CaAl2O4∶Eu2+,Nd3+ phosphors by co-doping Gd3+

• 作者: Mingxi Zhang Fengfeng Li Yongcheng Lin Yan Li Yi Shen
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: SPECTROSCOPY,LUMINESCENCE AND PHOSPHORS
• 页码范围: 930-937
• 页数: 8页
• 语种: 英文

摘要

In order to effectively improve the afterglow properties of CaAl2O4∶Eu2+,Nd3+ phosphors,a series of Ca0.982-xAl2O4∶0.012Eu2+,0.006Nd3+,xGd3+ (x =0,0.012,0.024,0.036,0.048,0.060 mol) phosphors were prepared by a high-temperature solid-phase approach.Crystalline composition and microstructure were characterized by XRD,TEM,HRTEM,and XPS,luminescence properties were systematically analyzed by fluorescence spectra,afterglow decay curves and TL glow curve.Results show that all of Ca0.982-xAl2O4∶0.012Eu2+,0.006Nd3+,xGd3+ phosphors belong to monoclinic CaAl2O4,without other cystalline phase.The blue emission at 442 nm is observed,which is assigned to the 4f65d → 4f7 transition of Eu2+ ions.Doping with appropriate amount of Gd3+ ions (x =0.036mol) significantly improves the afterglow properties of phosphors,but the excessive doping of Gd3+ induces the fluorescent quenching.The doping of moderate Gd3+ changes the traps states,the trap depth varies from 0.598 to 0.644 eV and the trap concentration is also greatly improved,thus significantly improving afterglow performance.