CaMoO4: Ho3+-Yb3+-Mg2+ upconverting phosphor for application in lighting devices and optical temperature sensing
CaMoO4: Ho3+-Yb3+-Mg2+ upconverting phosphor for application in lighting devices and optical temperature sensing
复制标题
DOI：
10.1016/j.snb.2015.01.007
复制
发表时间：
2015-04-01
影响因子：
8.4
通讯作者：
Rai, Vineet Kumar
中科院分区：
文献类型：
--
作者：
Dey, Riya;Kumari, Astha;Rai, Vineet Kumar
采用化学共沉淀法合成了Ho ~（3+），Yb ~（3+），Mg ~（2+）共掺杂的CaMoO_4荧光粉，并用X射线衍射分析了其结构。Mg ~（2+）离子的共掺杂由于替代效应导致晶格尺寸收缩。采用高分辨透射电子显微镜（HRTEM）和场发射扫描电子显微镜（FESEM）分别对所制备材料的粒径和表面形貌进行了分析。在980 nm激光激发下，所制备的荧光粉产生了强烈的红光（660 nm）和绿色（545 nm）的紫外发射，沿着有微弱的蓝光（460 nm，489 nm）和近红外（756 nm）发射带。已经观察到由于与Mg 2+离子的共掺杂，上转换（UC）发射强度的增强。分析了对应于F-5（4）、S-5（2）-> I-5（8）、F-5（5）-> I-5（8）跃迁的寿命，以交叉检查UC机制。研究了泵浦功率和外界温度对K-3（8）-> I-5（8）和F-5（3）-> I-5（8）跃迁的蓝光发射带的影响。(C)2015爱思唯尔B. V.保留所有权利。
The CaMoO4 phosphors codoped with Ho3+, Yb3+, Mg2+ ions, synthesized by chemical coprecipitationroute and characterized structurally by X- ray diffraction analysis have shown the tetragonal phase of CaMoO4. The codoping with Mg2+ ion causes shrinkage in the lattice dimension due to substitutional effect. For the investigation of particle size and the surface morphology of the prepared material the high resolution transmission electron microscopy ( HRTEM) and field emission scanning electron microscopy( FESEM) analysis have been performed respectively. The prepared phosphor powders upon excitationwith 980 nm laser radiation give intense red ( 660 nm) and green ( 545 nm) UC emissions along with weakblue ( 460 nm, 489 nm) and near infrared ( 756 nm) emission bands. The enhancement in the upconversion( UC) emission intensity has been observed due to codoping with Mg2+ ions. The lifetime corresponding to F-5(4), S-5(2) -> I-5(8), F-5(5) -> I-5(8) transitions have been analyzed to cross- check the UC mechanism. The effect ofvariation of pump power and also the external temperature on the blue emission bands correspondingto the K-3(8) -> I-5(8) and F-5(3) -> I-5(8) transitions respectively have been monitored to investigate the sensingproperty of the phosphor. (C) 2015 Elsevier B.V. All rights reserved.