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Enhanced afterglow performance of CaAl_(2)O_(4):Eu^(2+),Nd^(3+) phosphors by co-doping Gd^(3+)

Journal of Rare Earths 2021年第8期39卷 930-937页

作者： Mingxi Zhang Fengfeng Li Yongcheng Lin Yan Li Yi Shen Light Alloy Research Institute of Central South University Changsha 410083China Key Laboratory of Inorganic Nonmetallic Materials Hebei Province Key Laboratory of Environment Functional Materials of Tangshan CityCollege of Materials Science and EngineeringNorth China University of Science and TechnologyTangshan 063210China School of Mechanical and Electrical Engineering.Central South University Changsha 410083China

In order to effectively improve the afterglow properties of CaAl_(2)O_(4):Eu^(2+),Nd^(3+) phosphors,a series of Ca_(0.982-x)Al_(2)O_(4):0.012 Eu^(2+),0.006 Nd^(3+),xGd^(3+)(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 Ca_(0.982-x)Al_(2)O_(4):0.012 Eu^(2+),0.006 Nd^(3+),xGd^(3+)phosphors belong to monoclinic CaAl_(2)O_(4),without other cystalline phase.The blue emission at 442 nm is observed,which is assigned to the 4f^(6)5 d→4f^(7) transition of Eu^(2+) ions.Doping with appropriate amount of Gd^(3+) ions(x=0.036 mol) significantly improves the afterglow properties of phosphors,but the excessive doping of Gd^(3+) induces the fluorescent quenching.The doping of moderate Gd^(3+) 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.

关键词： CaAl_(2)O_(4):Eu^(2+),Nd^(3+) Gd^(3+)ions afterlow Trap depth Mechanism Rare earths

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Progress of Studies on Multi-Color Long Afterglow Luminescence Materials

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Journal of Rare Earths 2004年第Z1期22卷 295-301页

作者： Li Qun Teng Xiaoming General Research Institute for Nonferrous Metals Beijing 100088 Grirem Advanced Materials Co.Ltd.Beijing 100088 China Institute of Chemistry and Material Science Anhui Normal University Wuhu241000 China

Progress of studies on various multi-color long afterglow luminescence materials was reviewed.Two luminescent mechanism of long afterglow behavior were discussed.Further research and development prospects about the ma... 详细信息

关键词： long afterlow materials mechanism luminescence rare earths

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