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Eu3þ, Liþ doped CaWO4 nanorods: Synthesis, emission-decay curves and effective-refractive index
Xiuna Tian,Guicheng Jiang,Yonghu Chen,Min Yin 한국물리학회 2014 Current Applied Physics Vol.14 No.12
In the present paper, CaWO4: Eu3þ, Liþ nanorods have been successfully synthesized via an oleic acid (OA)-assisted solvethermal route. The transmission electron microscope (TEM) photograph shows that the CaWO4: Eu3þ, Liþ nanorods are monodisperse and uniform nanorods with average diameter of 26 nm. The optical properties of Eu3þ in CaWO4 samples, including photoluminescence (PL) excitation spectra and luminescent decay curves, are investigated in detail. Due to the form of the nanorods, the relative contribution of CTB to the nanorods sample is greater than that to the bulk counterparts. The decay time of the 5D0 level (ranging from 0.94 to 0.65 ms, depending on the filling factor of the nanorods) of the nanorods is longer than that of the bulk counterpart mainly due to the reduction in the size of the nanorods, which introduces an effective-refractive index smaller than the refractive index of CaWO4.
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XIUNA SHI 한국동양예술학회 2018 동양예술 Vol.41 No.-
图式是隐藏于作品之后的信息系统,在艺术家的创作过程中是看不见的脉络,处于宏观控制艺术创作的观念层面,艺术家的创作是在自身所处文化的既有图式基础上进行的投射,并因自身的艺术诉求对原图式进行挪用及重构,使图式“陌生化”,呈现出不同的艺术形态,并因此产生新的图式。艺术作品的多义性和理解的复杂性与图式的存在联系密切。徐冰的“文字”、蔡国强的“火药”、吕胜中的“剪纸”以艺术品的形式载体出现,而这些东方文化图式在被挪用的过程中,其负载的信息系统同时发生了作用,成为作品的理解背景之一。艺术家建立自己艺术面貌的过程,往往是在固有文化图式的基础上所进行的个人化的改变并建立新的图式系统的过程。在观看过程中,图式被观者所辨认和解读,其后的丰富意义被理解或误读,从而使艺术家的创作目的得以展现。 艺术作品往往具备复杂性和多义性,是因为作品图式、形式语言、表现方式在不同的观者的解读过程中产生了不同程度的作用。对于图式的理解要求创作者与观看者具备相似的文化背景,对于艺术品的理解过程因此也成为对于其暗含的图式系统的解码过程,因此,对于中国当代艺术中的图式的作用机制的研究能够帮助观看者真正理解艺术家的创作意图和艺术品的价值所在。 关键词:图式,中国当代艺术,作用机制,创作意图.
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A new red-emitting phosphor of Eu3+-doped Sr2MgMoxW1−xO6 for solid state lighting
Shuo Li,Xiantao Wei,Kaimo Deng,Xiuna Tian,Yanguang Qin,Yonghu Chen,Min Yin 한국물리학회 2013 Current Applied Physics Vol.13 No.7
The white light-emitting diode has recently attracted great attention as a promising candidate for next generation lighting. The solid solution of Sr1.80Eu0.10Li0.10MgMoxW1-xO6 was synthesized via hightemperature solid-state reaction and this solid solution is treated as a promising red emitting phosphor for white light-emitting diodes. In our cases, the X-ray diffraction, excitation spectra, emission spectra and decay curves of these solid solutions were measured as a function of the Mo/W ratio to characterize the structural and luminescent properties. The excitation bands of the series of phosphors are consistent well with the region of near ultraviolet light, and the phosphors present better color purity than the commercial phosphor Y2O2S:Eu3þ in current use. Taking these properties into consideration,this kind of material may find a great potential application as a red phosphor for near-ultraviolet excited white light-emitting diodes.
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