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Ca0.8La0.2-x-yMoO4∶xTb3+,yEu3+荧光材料的水热合成及多色发光性质

ISSN号：1000-7032
期刊名称：《发光学报》
时间：0
分类：O482.31[理学—固体物理;理学—物理]
作者机构：[1]长春理工大学化学与环境工程学院应用化学与纳米技术吉林省高校重点实验室
相关基金：国家自然科学基金(51072026,50972020);吉林省科技发展计划(2013000206002GX)资助项目

关键词： Ca0.8La0.2MoO4, 荧光材料, 水热合成, 多色发光, Ca0.8La0.2MoO4, luminescent material, hydrothermal preparation, multi-color emitting

中文摘要：

采用水热法制备了Ca0.8La0.2-x-y MoO4∶xTb3+,yEu3+荧光材料,并对其结构和发光性能进行了研究。X射线衍射(XRD)分析表明,合成的样品为四方晶系的CaMoO4白钨矿结构,稀土离子La3+、Eu3+、Tb3+的引入不会改变主晶格的结构。荧光光谱表明,与CaMoO4∶Eu3+荧光粉相比,基质中掺杂La后的Ca0.8La0.15MoO4∶0.05Eu3+样品的616 nm(5D0→7F2)处的特征发射峰明显增强。在285 nm紫外光激发下,Ca0.8La0.16-y MoO4∶0.04Tb3+,yEu3+(y=0.01,0.03,0.05,0.07)系列样品在545 nm和616 nm处出现的发射峰,分别对应于Tb3+的5D4→7F5跃迁和Eu3+的5D0→7F2跃迁,并且随着Eu3+掺杂量的增加,Tb3+的发射峰逐渐减弱,Eu3+的发射峰逐渐增强,表明该荧光材料中存在着由Tb3+到Eu3+能量传递。随着Ca0.8La0.16-y MoO4∶0.04Tb3+,yEu3+(y=0.01,0.03,0.05,0.07)系列样品中激活剂Eu3+掺杂量的增加,荧光粉实现了从绿色→黄绿→黄色→红色的颜色可调。

英文摘要：

Ca0. 8La0. 2- x-yMoO4∶ xTb3+,yEu3+fluorescent materials were prepared by hydrothermal method. The crystal structure and luminescence properties were studied. X-ray diffraction( XRD)patterns confirm that the crystal structure of the samples matches well with the tetragonal CaMoO4.The introduction of rare earth ions La3+,Eu3+,and Tb3+doesn’t change the structure of the host lattice. Comparing with CaMoO4∶ Eu3+phosphors,the characteristic emission peak in 616 nm(5D0→7F2) of Ca0. 8La0. 15MoO4∶0. 05Eu3+is enhanced obviously. The emission spectra of Ca0. 8La0. 16- yMoO4∶ 0. 04Tb3+,yEu3+( y =0. 01,0. 03,0. 05,0. 07) exhibit two emission peaks at545 nm and 616 nm under 285 nm UV excitation,corresponding to the transition of5D4→7F5of Tb3+ and 5D0→7F2of Eu3+. It is found that the emission intensity of Eu3+increases and the emission intensity of Tb3+decreases with the increasing of Eu3+content,indicating that there is energy transfer of Tb3+→Eu3+. Moreover,the luminescence colors of the Ca0. 8La0. 16- yMoO4∶ 0. 04Tb3+,yEu3+( y =0. 01,0.03,0.05,0.07) samples can be tuned from green,green-yellow and yellow to red by simply adjusting the relative doping concentrations of the activator ion of Eu3 +under a single wavelength excitation.

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