检索结果-南通市图书馆

维普期刊数据库

Synthesis of long afterglow phosphors MAl_2O_4∶Eu^(2+), Dy~ (3+)(M=Ca, Sr, Ba) by Microemulsion Method and Their Luminescent Properties

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2005年第5期23卷 629-632页

作者：邱关明陈永杰耿秀娟肖林久田一光孙彦彬 School of Materials and Engineering Changchun Science and Technology University Changchun 130022 ChinaSchool of Materials and Metallurgy Northeastern University Shenyang 110006 China School of Materials and Metallurgy Northeastern University Shenyang 110006 China School of Applied Chemistry Shenyang Institute of Chemical Technology Shenyang 110142 China School of Applied Chemistry Shenyang Institute of Chemical Technology Shenyang 110142 China Department of Chemistry Wenzhou University Wenzhou 325027 China School of Materials and Metallurgy Northeastern University Shenyang 110006 ChinaCollege of Materials Science and Engineering Jilin University Changchun 130026 China

long afterglow phosphors MAl2O4：Eu^2＋ , Dy^3＋（M = Ca, Sr, Ba） were synthesized by microemulsion method, and their crystal structure and luminescent properties were compared and investigated. XRD patterns of samples indicate that phosphors CaAl2O4：Eu^2＋, Dy^3＋ and SrAl2O4 ： Eu^2＋, Dy^3＋ are with monoelinie crystal structure and phosphor BaAl2O4：Eu^2＋ , Dy^3＋ is with hexagonal crystal structure. The wide range of excitation spectrum of phosphors MAl2O4： Eu^2 ＋ , Dy^3＋（M = Ca,Sr, Ba） indicates that the luminescent materials can he excited by light from ultraviolet ray to visible light and the maximum emission wavelength of phosphors MAl2O4：Eu^2＋ , Dy^3＋（M = Ca, Sr, Ba） is found mainly at λem of 440 nm （M = Ca）, 520 nm （M = Sr） and 496 nm （M = Ba） respectively, the corresponding colors of emission light are blue, green and eyna-green respectively. The afterglow decay tendency of phosphors can he summarized as three processes： initial rapid decay, intermediate transitional decay and very long slow decay. afterglow decay curves coincide with formula I = At^ - n, and the sequence of afterglow intensity and time is Sr 〉 Ca 〉 Ba.

关键词： inorganic non-metal materials microemulsion method long afterglow phosphor luminescent properties rare earths

维普期刊数据库

Quenching Study on Iron Impurity in Eu^(2+), Dy^(3+) Doped Strontium Aluminate phosphor Prepared by Nano-Coating Process

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2007年第S1期25卷 326-329页

作者：杨雪峰宁桂玲刘杰潘文林源 State Key Laboratory of Fine Chemicals and School of Chemical Engineering Dalian University of Technology

A series of long afterglow phosphors, Eu2+, Dy3+, with different iron content were prepared by nano-coating process. The resulted precursors were characterized by Transmission Electron Microscope (TEM), which suggested that the precursor particles had nanometer size distribution. The optical quenching of iron impurity on the phosphor powders were investigated by X-Ray powder Diffraction (XRD) and photoluminescence methods. The XRD indicates that a pure monoclinic SrAl2O4∶Eu2+, Dy3+ was formed at 1200 ℃ and iron impurity up to 296.36×10-4% had no effect on the SrAl2O4∶Eu2+, Dy3+ phase structure. However, the luminescence intensity were strongly dependent on the trace iron impurity, which might be explained that iron displace the aluminium and form Fe-O bond, which competed energy with Eu2+ and transfer red them to infrared sites.

关键词： long afterglow phosphor SrAl_2O_4∶Eu^(2+), Dy^(3+) iron impurity quenching rare earths

维普期刊数据库

Luminescent Properties of SrAl2O4:Eu, Dy Material Prepared by Combustion Method

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2006年第S2期 33-36页

作者：沈毅郑振太张平曲远方 School of Materials Science and Engineering Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 ChinaHebei Polytechnic University Tangshan 063009 China School of Materials Science and Engineering Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 ChinaHebei University of Technology Tianjin 300130 China

SrAl2O4∶Eu, Dy materials were prepared by the combustion of a mixture of the respective metal nitrates and urea at 500～700 ℃, over a time of 3～5 min, respectively. Compared with samples prepared by solid state reaction, the sintering temperature of combustion method is greatly reduced. The solid combustion products were identified by their characteristic X-ray powder diffraction patterns. A slight blue shift occurs in the excitation and emission spectra of the product prepared by the combustion method.

关键词： long afterglow phosphor combustion synthesis strontium aluminate crystal field rare earths

Effects of Crystal Field on long phosphorescent Properties of SrAl2O4:Eu, Dy phosphor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2006年第S2期 37-39页

作者：沈毅张平郑振太曲远方 School of Materials Science and Engineering Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 ChinaHebei University of Technology Tianjin 300130 China Tianjin 300072 ChinaHebei Polytechnic University Tangshan 063009 China School of Materials Science and Engineering Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University

SrAl2O4∶Eu, Dy with Al/Sr ratio varying and Ba, Mg incorporation changing to a different crystal field was prepared by the combustion method to yield efficient luminescent phosphors. It is found that the ratio of Al to Sr strongly affects the emission spectra, as observed by fluorescence spectra. Based on XRD analysis, the effect of the ratio of Al to Sr on the host structure was discussed and an explanation on the color change was proposed. In addition, the effect of some alkali earth ions substituting in part for Sr2+ in strontium aluminate was investigated.

关键词： long afterglow phosphor combustion synthesis strontium aluminate crystal field rare earths