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- 저자 : Chen Longqing (검색결과 2 건)
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Mi, Longqing,Xu, Jian,Feng, Yongyi,Cao, Lei,Xue, Mingqiang,Huang, Yanlin,Chen, Cuili,Seo, Hyo Jin Elsevier 2018 Materials chemistry and physics Vol.204 No.-
<P><B>Abstract</B></P> <P>Yb<SUP>3+</SUP> (0.5–30 mol %) activated Y<SUB>4</SUB>CdMo<SUB>3</SUB>O<SUB>16</SUB> phosphors have been prepared by the traditional solid-state reaction method. The phase formation was investigated by the XRD structural refinements. The surface properties of the powder phosphors were verified by SEM, TEM and EDS measurements. The optical properties were evaluated by the reflectance spectra, photoluminescence excitation and emission spectra, decay curves (lifetimes), and the absolute quantum efficiency (QE). Under the excitation of UV light, Yb<SUP>3+</SUP>-activated Y<SUB>4</SUB>CdMo<SUB>3</SUB>O<SUB>16</SUB> shows the efficient near-infrared (NIR) emission bands (900–1100 nm), which is ascribed to the <SUP>2</SUP>F<SUB>5/2</SUB> → <SUP>2</SUP>F<SUB>7/2</SUB> transitions of Yb<SUP>3+</SUP> ions. The NIR emission intensity shows a dependence on Yb<SUP>3+</SUP> contents, which has an optimal doping of 25 mol %. The energy transfer (ET) from MoO<SUB>4</SUB> to Yb<SUP>3+</SUP> ions in the lattices was discussed. The NIR emission around 1000 nm just corresponds to the optical response of Si-based solar cells. Consequently, the efficiency could be enhanced by arranging luminescent layers mixed with Y<SUB>4</SUB>CdMo<SUB>3</SUB>O<SUB>16</SUB>:Yb<SUP>3+</SUP> phosphors and transparent matrix in the front surface of Si solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The structural refinements of the Yb<SUP>3+</SUP>-doped phosphors were completed. </LI> <LI> The charge transfer of the molybdate to Yb<SUP>3+</SUP> ions is efficient. </LI> <LI> Efficient conversion from near UV light to Yb<SUP>3+</SUP> IR emission was demonstrated. </LI> <LI> This is an excellent candidate for enhancement of spectral response of Si-based solar cells. </LI> </UL> </P>
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Preparation of W–V functionally gradient material by spark plasma sintering
Tang Yi,Qiu Wenbin,Chen Longqing,Yang Xiaoliang,Song Yangyipeng,Tang Jun 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
Functionally gradient material (FGM) is promisingly effective in mitigating the thermal stress between plasma facing materials (PFM) and structural materials. However, the corresponding research with respect to W/V FGM has not been reported yet. In this work, we firstly report the successful fabrication of W/V FGM by a combined technology of mechanical alloying (MA) and spark plasma sintering (SPS). The microhardness and microstructure of the consolidated sample were both investigated. W/V stacks show significantly enhanced microhardness (>100%) compared with pure W plate, which is beneficial to the integral strength of the hybrid structure. Furthermore, we clarify that the different ductility of W and V should be carefully considered, otherwise W/V powder might aggregate and lead to the formation of compositional segregation, and simultaneously unmask the impact of V proportion on the distribution of second phase in WeV binary alloy system. This w
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