Influence of Ca<sup>2+</sup> Ion Doping on the UV Excitation Fluorescence Properties of Ce:LuAG Phosphors

文章采用固态反应法制备了一系列Ca2+离子掺杂的Ce:LuAG荧光粉，旨在研究Ca2+离子掺杂对Ce:LuAG荧光粉紫外激发荧光性能的影响。重点研究了样品的吸收谱、荧光光谱、荧光寿命以及热释光曲线。实验结果表明，随着Ca2+离子的掺杂浓度的增加，样品的光致发光谱强度显著降低。但是Ca2+离子的掺杂可以显著减少样品的荧光衰减时间。当Ca2+离子掺杂浓度为0.6 at%时，荧光衰减时间相较于未掺杂Ca2+减少了27.62 ns。热释光曲线的结果显示，Ca2+离子的掺杂会显著降低热释光的强度。表明Ca2+离子的存在有助于抑制缺陷引起的负面效果。In this paper, a series of Ca2+ doped Ce:LuAG phosphors were prepared using the solid-state reaction method to investigate the effect of Ca2+ doping on the ultraviolet excitation fluorescence properties of Ce:LuAG phosphors. The absorption spectra, fluorescence spectra, fluorescence lifetime and thermoluminescence curves of the samples were analyzed. The experimental results indicate that with the increase of Ca2+ ion doping concentration, the photoluminescence intensity of the sample is significantly reduced. However, the doping of Ca2+ ions can markedly decrease the fluorescence decay time of the sample. When the doping concentration of Ca2+ ions is 0.6 at%, the fluorescence decay time is reduced by 27.62 ns compared to undoped Ca2+. The results of the thermoluminescence curve demonstrate that the doping of Ca2+ ions significantly reduces the intensity of thermoluminescence. This indicates that the presence of Ca2+ ions helps to suppress the negative effects caused by defects.