摘要
通过高温固相法制备了Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+)长余辉发光材料。采用XRD、SEM、激发光谱、发射光谱和余辉衰减曲线对Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+)长余辉发光材料的微观结构以及光学性能进行了表征,研究结果表明Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+)长余辉发光材料的晶体结构和显微结构均未发生明显变化。Yb~(3+)的引入使得Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+)显示出更优良的荧光性能和余辉性能,不同Yb~(3+)掺量对长余辉发光材料的陷阱深度和电子传输速率有显著影响。实验表明,当Yb~(3+)掺杂量为0.03时,Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+)的荧光光谱相对强度最强,且表现出最佳的余辉衰减性能。
Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+)long afterglow phosphors were prepared via high-temperature solid state reaction.Microstructure and optical properties of Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+) long afterglow phosphors were characterized through XRD,SEM,excitation spectrum,emission spectrum and decay curves.The results show that the crystal structure and microstructure of Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+) have not changed significantly.The addition of Yb~(3+) ions shows a remarkable change in fluorescent properties and afterglow performance.The introduction of Yb~(3+)makes Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+) have better fluorescence performance and afterglow properties.Different Yb~(3+) doping amounts have a significant effect on the trap depth and electron transport rate of the long afterglow phosphors.When the doping amount of Yb~(3+)equals to 0.03,experiments show that the Sr_2MgSi_2O_7∶Eu~(2+),Dy~(3+),Yb~(3+)has the strongest fluorescence intensity and the best afterglow attenuation performance.
引文
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