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91.
《中国物理快报》2003,20(10):1871-1874
92.
A europium complex Eu (DBM)3 TPPO (Eu tris(benzoylmethide)-(triphenylphosphine oxide)) and silicon nanoparticles have been hybridized.The hybridization can evidently change the photoluminescence (PL) characteristics of the Eu complex in the following aspects:under an excitation of 390nm,the intensity of the PL peak at 611nm due to the ^5Du-^7F2 transition of the Eu^3 ions has been increased by 30%,and thc integrated PL intensity in the visible range has been increased by nearly 3 times;the PL excitation efficiency beyond 440nm has been improved cvidently;the peak in the PL excitation spectrum shifts from 408nm to 388nm,and the PL decay time decreases from 2.07 to 0.96μs,The experimental results indicatde that in the PL process,the photoexcited energy may transfer from the silicon nanoparticlcs to the Eu^3 ions. 相似文献
93.
The experimental conditions for photoactivated intermittent fluorescence from nanoscale silver oxide were studied with fluorescence microscopy.Strong fluorescence was observed from the Ag2O particles with size of 10-20nm excited with both blue and green light .We observed the saturation of Photoexcitation with blue light and explained the experimental results using the model of agglomeration of silver atoms to form small clusters and the fluorescence of Ag2 and Ag3 clusters. 相似文献
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Improved Performance of Solid-State Gratzel Solar Cell by Cosensitization of Quantum Dot and Dye
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LIBin WANGLi-Duo LIJiang-Wei QIUYong 《中国物理快报》2004,21(7):1391-1393
We report a new cosensitization utilizing quantum dot (QD) PbS and Cis-(SCN)2Bis(2,2‘-bipyridyl-4,4‘-dicarboxylate) ruthenium (N3) dye on the nanoporous Ti02 film. Solid-state Gratzel solar cells with the cosensitized films show an improved overall efficiency by 200% relative to the cells assembled with only N3 sensitization and an extremely high open-circuit voltage of 840mV, and a fill factor of 70.5~. Back reaction characteristics of the above cells are also investigated, demonstrating a great suppression of recombination due to cosensitization. It seems that the cosensitization also facilitates the electron injection into the conduction band of TiO2. 相似文献
96.
RupingZou AibingYu 《中国颗粒学报》2003,1(1):27-32
The initial forming of fiber blend to high green density, i.e. the packing of fibrous particles, is important to the reinforcement of composite materials. It is very useful to develop a general predictive method for the optimum selection of particle mixtures for the property control of ceramic or composite products. This paper presents such a mathematical model developed on the basis of the similarity analysis between the spherical and non-spherical particle packings and assesses its applicability to the packing of fibrous particles with discrete and/or continuous length distributions. The results indicate that the model can predict this packing system well and hence provide an effective way to solve various packing problems in the composite materials processing. 相似文献
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给出一种不依赖于具体动量图象求粒子反应中初态粒子的阈能和末态粒子最大能量的方法,并就常见的粒子反应作了讨论。 相似文献
100.
利用16O重离子束轰击142Nd和147Sm同位素靶分别生成153Er和157Yb.借助氦喷嘴带传输系统和X-γ、γ-γ符合测量方法分离鉴别核素并测量其衰变性质.首次建立了153Er和157Yb的EC/β+衰变纲图.从中指认出153Ho的一个新三(准)粒子态和两个新单粒子态,指认出157Tm的一个新的同质异能态和一条新转动带.低位能级系统分析表明:在Ho和Tm这两条奇A核的同位素链中基态形状的转变区都在中子数86和88之间. 相似文献