Abstract 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 showed that all of Ca0.982–xAl2O4:0.012Eu2+,0.006Nd3+,xGd3+ phosphors belonged to monoclinic CaAl2O4, without other cystalline phase. The blue emission at 442 nm were observed, which was assigned to the 4f65d →4f7 transition of Eu2+ ions. Doping with appropriate amount of Gd3+ ions (x = 0.036mol) significantly improved the afterglow properties of phosphors, but the excessive doping of Gd3+ induced the fluorescent quenching. The doping of moderate Gd3+ changed the traps states, the trap depth varied from 0.598 to 0.644 eV and the trap concentration was also greatly improved, thus significantly improving afterglow performance.

中文翻译：

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通过共掺杂 Gd3+ 增强 CaAl2O4:Eu2+,Nd3+ 荧光粉的余辉性能

摘要 为了有效改善CaAl2O4:Eu2+,Nd3+荧光粉的余辉特性，一系列Ca0.982-xAl2O4:0.012Eu2+,0.006Nd3+,xGd3+(x=0,0.012,0.024,0.0486,0mol.0.036,0mol.采用高温固相法制备。通过XRD、TEM、HRTEM和XPS对晶体成分和微观结构进行表征，通过荧光光谱、余辉衰减曲线和TL辉光曲线系统地分析了发光性能。结果表明，Ca0.982–xAl2O4:0.012Eu2+,0.006Nd3+,xGd3+荧光粉均属于单斜CaAl2O4，没有其他晶相。观察到 442 nm 处的蓝色发射，这归因于 Eu2+ 离子的 4f65d →4f7 跃迁。掺杂适量的Gd3+离子（x=0.036mol）显着改善了荧光粉的余辉特性，但过量掺杂 Gd3+ 会导致荧光猝灭。中等Gd3+的掺杂改变了陷阱状态，陷阱深度从0.598到0.644 eV变化，陷阱浓度也大大提高，从而显着提高了余辉性能。