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Er^(3+)/Yb^(3+)/Li^+/Zn^(2+):Gd_2(MoO_4)_3 upconverting nanophosphors in optical thermometry 被引量:5
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作者 Anita Kumari Lakshmi Mukhopadhyay Vineet Kumar Rai 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第3期242-247,共6页
Er^(3+)-Yb^(3+)-Li^+:Gd_2(MoO_4)_3 and Er^(3+)-Yb^(3+)-Zn^(2+):Gd_2(MoO_4)_3 nanophosphors, synthesized by chemical co-precipitation technique were characterized through XRD,FESEM,dynamic light scattering(DLS),diffuse... Er^(3+)-Yb^(3+)-Li^+:Gd_2(MoO_4)_3 and Er^(3+)-Yb^(3+)-Zn^(2+):Gd_2(MoO_4)_3 nanophosphors, synthesized by chemical co-precipitation technique were characterized through XRD,FESEM,dynamic light scattering(DLS),diffuse reflectance, photoluminescence, photometric and decay time analysis. The enhancement of about~28, ~149 and ~351 times in the green upconversion emission band is observed for the optimized Er^(3+)-Yb^(3+),Er^(3+)-Yb^(3+)-Li^+ and Er^(3+)-Yb^(3+)-Zn^(2+):Gd_2(MoO_4)_3 nanophosphors in comparison to the singly Er^(3+) doped nanophosphors. The electric dipole-dipole interaction is found to be responsible for the concentration quenching. The temperature dependent behaviour of the two green thermally coupled levels of the Er^(3+) ions based on the fluorescence intensity ratio technique was studied. The maximum sensor sensitivity ~38.7 × 10^(-3) K^(-1) at 473 K for optimized Er^(3+)-Yb^(3+)-Zn^(2+) codoped Gd_2(MoO_4)_3 nanophosphors is reported with maximum population redistribution ability~88% among the ~2H_(11/2) and ~4S_(3/2) levels. 展开更多
关键词 UPCONVERSION PHOSPHORS Dynamic light scattering non-lanthanide ions OPTICAL thermometry Rare earths
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非稀土掺杂协同核壳包裹对氟化物纳米晶上转换发光性能的增强 被引量:2
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作者 马丹阳 丁明烨 +5 位作者 戴建斌 胡琪唯 潘雅静 李雨亭 陈大钦 季振国 《发光学报》 EI CAS CSCD 北大核心 2016年第3期286-293,共8页
为提高上转换纳米晶的发光效率,提出协同增强的策略,将核壳包裹和非稀土离子掺杂两种方式进行有效的结合,使上转换纳米晶的发光效率实现"1+1>2"的增强效果。以Na Gd F_4作为基质材料,Yb^(3+)和Er^(3+)分别作为敏化离子和... 为提高上转换纳米晶的发光效率,提出协同增强的策略,将核壳包裹和非稀土离子掺杂两种方式进行有效的结合,使上转换纳米晶的发光效率实现"1+1>2"的增强效果。以Na Gd F_4作为基质材料,Yb^(3+)和Er^(3+)分别作为敏化离子和发光离子,以Li^+离子和Na Gd F_4作为非稀土掺杂离子和包裹壳层来构建核/壳纳米结构,研究两种增强方式的协同作用对Na Gd F4∶Yb^(3+)/Er^(3+)纳米晶的上转换发光性能的影响。结果表明,Li+离子掺杂与包裹Na Gd F4壳层共同作用使得β-Na Gd F4∶Yb^(3+)/Er^(3+)纳米晶的上转换发光增强了39倍,明显优于单一方式的增强效果。通过一系列的优化实验结果发现,Li+离子的最佳掺杂摩尔分数为4%。基于以上实验结果,给出了非稀土离子掺杂核壳纳米晶协同增强上转换发光效率的机理。 展开更多
关键词 非稀土离子掺杂 核壳包裹 β-Na Gd F4∶Yb3+/Er3+ 上转换发光
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Er^(3+)-Yb^(3+)-Na^(+):ZnWO_(4) phosphors for enhanced visible upconversion and temperature sensing applications 被引量:2
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作者 Sonali Biswas Lakshmi Mukhopadhyay +1 位作者 Manisha Mondal Vineet Kumar Rai 《Journal of Rare Earths》 SCIE EI CAS CSCD 2021年第3期291-296,I0002,共7页
The crystal structure and surface morphology of the Er^(3+)/Yb^(3+)/Na+:ZnWO_(4) phosphors synthesized by solid state reaction method were analyzed by X-ray diffraction(XRD) and field emission scanning electron micros... The crystal structure and surface morphology of the Er^(3+)/Yb^(3+)/Na+:ZnWO_(4) phosphors synthesized by solid state reaction method were analyzed by X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM) analysis.The frequency upconversion(UC) emission study in the developed phosphors was investigated by using 980 nm laser diode excitation.The effect of codoping in the Er^(3+):ZnWO_(4) phosphors on the UC emission intensity was studied.The UC emission bands that are exhibited in the blue(490 nm),green(530,552 nm),red(668 nm) and NIR(800 nm) region correspond to the ^(4)F_(7/2)→^(4)I_(15/2).^(2)H_(11/2),^(4)S_(3/2)→^(4)I_(15/2),^(4)F_(9/2)→^(4)I_(15/2) and ^(4)I9/2→^(4)I_(15/2) transitions,respectively.The temperature sensing performance of the Er^(3+)-Yb^(3+)-Na+:ZnWO_(4) phosphors was investigated based on the 2 H_(11/2)→^(4)I_(15/2) and ^(4)S_(3/2)→^(4)I_(15/2) thermally coupled transitions of the Er^(3+)ions.The photometric study was also carried out for the developed phosphors. 展开更多
关键词 UPCONVERSION non-lanthanides Temperature sensing Fluorescence intensity ratio Rare earths
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