稀土离子掺杂钛酸钙材料制备及发光性能研究

Preparation of Rare Earth Ion Doped Calcium Titanate Materials and Research on its Luminescence Properties

通过高温固相法,成功制备了CaTiO_(3):Dy^(3+)纳米发光材料。采用X-射线衍射(XRD)、扫描电镜(SEM)、荧光分光光度计等方法研究了镝的掺杂量对微观形貌和发光性能的影响。结果表明,X-射线衍射峰强度随着Dy^(3+)掺杂量的增加而增强。波长范围为400 nm—650 nm发射光谱图中,当Dy^(3+)掺杂量为2%、4%、6%时,均在530 nm处出现了Dy^(3+)的特征发射峰;当Dy^(3+)掺杂量为8%时,出现三个明显的峰,分别位于530 nm、613 nm、618 nm处,与Dy^(3+)离子的^(5)D0→^(7)F_(2)、^(1)D2→^(3)H_(4)的跃迁发射有关。由于能量传递的作用,530 nm处Dy^(3+)的发射随Dy^(3+)掺杂量的增加逐渐增强。当掺杂量为8%时,发光强度减弱;当Dy^(3+)的掺杂量为6%时,其发光强度达到了最大值。同时,荧光寿命随Dy^(3+)掺杂量的增大而呈现先增后减的趋势,与荧光强度的变化趋势一致。

In this paper,CaTiO_(3):Dy^(3+)nano-luminescent materials were successfully prepared by high temperature solid-phase method.The effects of dysprosium doping amount on microstructure and luminescence properties were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and fluorescence spectrophotometer.The results show that the intensity of X-ray diffraction peak increases with the increase of Dy^(3+)doping content,and the emission spectrum ranges from 400 nm to 650 nm.In the emission spectrum diagram,the characteristic emission peak of Dy^(3+)appears at 530 nm when the Dy^(3+)doping content is 2%,4%and 6%,and three obvious peaks appear when the Dy^(3+)doping content is 8%They are located at 530 nm,613 nm,618 nm,which is related to the transition emission of Dy^(3+)ion ^(5)D0→^(7)F_(2)、^(1)D2→^(3)H_(4).Due to the action of energy transfer,the emission of Dy^(3+)at 530 nm gradually increases with the increase of Dy^(3+)doping amount.When the doping content was 8%,the luminescence intensity weakened,and when the doping content of Dy^(3+)was 6%,the luminescence intensity reached its maximum value.Meanwhile,the fluorescence lifetime increased first and then decreased with the increase of the doping content of Dy^(3+),which was consistent with the change trend of fluorescence intensity.