Facile synthesis of accordion-like Y2O3:Er3+ nanothermometers for ratiometric temperature sensing applications
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Photon Upconversion
Nanomaterials
Atmospheric temperature range
Emission intensity
To get CaTiO3catalyst with high photocatalytic properties,the effect of calcination conditions,on the photocatalytic activity of CaTiO3 was investigated.The calcination conditions included heating rate of calcination precursors,calcination temperature,calcination time and cooling rate of calcination products,The catalyst was synthesized by solid-state reaction method with Ca(NO3)2and TiO(OH)2as raw materials and NaOH as mineralizer.The physical properties of the catalyst were characterized using XRD and SEM.The experimental results showed that the activity increased until reached a maximum,and then decreased with the increasing heating rate of calcination precursors;the photocatalytic activity decreased drastically with the fast cooling rate of calcination products.Moreover,the optimal values of calcination temperature and calcination time were obtained.As a result,the CaTiO3catalysts with high photocatalytic activity can be obtained under an optimized calcination conditions after loading CoO(0.2 wt%)co-catalyst.
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Photon Upconversion
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有 infrared-to-visible 频率 upconversion 光的 Er3+-Yb3+ codoped oxy-fluoro-tungstosilicate 眼镜被融化在空中熄灭准备。在样品的光性质上做的 Er3+ 的效果借助于象光吸收系列和光致发光系列那样的技术被测量。结果显示出在 546 和 665 nm 集中的那块强烈草地和红信号，相应于 4S3/24I15/2 和由 multiphoton 的 Er3+ 的 4F9/24I15/2 转变分别地，逐步的帮助声子的激动状态的吸收过程被使样品激动，二极管激光在房间温度在 980 nm 操作同时观察。upconversion 过程在 5 mol.% 的一个经常的 Yb2O3 内容被发现很敏感到 Er3+ 内容。随从 0.5% ～ 1.5% 的 Er3+ 内容的增加， upconversion 紧张逐渐地增加了。到 3.0% 的 Er3+ 内容的进一步的增加导致了熄灭的重要荧光。而且，可能的 upconversion 机制在刺激力量上基于匹配精力的条件和二次的依赖被讨论。
Photon Upconversion
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Photon Upconversion
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The three-dimensional ordered macroporous CeO2:Yb,Er materials were prepared, and the influence of doping concentration of Yb3+ or Er3+ ions on upconversion property was investigated. Green and red upconversion emissions were observed under the excitation of 980 nm at room temperature. It was found that the ratio of red to green upconversion emission intensity increased with increasing of concentration of the Yb3+ or Er3+ ions in the three-dimensional ordered macroporous CeO2:Yb,Er materials. When the concentration of Yb3+ was 10 mol.%, pure red upconversion emission was obtained. The varied mechanism of ratio of red to green upconversion emission intensity was discussed with the concentration of Yb3+ or Er3+ ions.
Photon Upconversion
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