Preparation and characterization of rare earth doping YAG phosphors and Y-TZP nanopowder

本文用丙烯酰胺体系高分子网络凝胶法进行了低温制备稀土掺杂YAG（钇铝石榴石，Y3Al5O12）纳米荧光粉（含YAG:Eu3+、YAG:Ce3+和YAG:Tb3+三个系统）的研究和探索，研究了热处理温度和掺杂浓度对发光性能的影响；探索了用MOCVD（金属有机化学气相沉积）制备YAG:Eu3+荧光粉的新方法；用高分子网络凝胶法成功制备了Y-TZP（Y2O3稳定的四方相ZrO2）纳米粉。主要成果和进展如下： 1)聚丙烯酰胺体系高分子网络凝胶法能显著降低YAG的合成温度，XRD和TG-DTA分析表明，在850℃时，系统仅存在纯YAG相。XRD分析和SEM观察显示，粉体颗粒粒径纳米级，分布范围较窄；随...In the present paper, a novel way named polyacrylamide gel method was employed to synthesize the rare earth doping YAG (yttrium aluminum garnet, Y3Al5O12) nano-sized YAG: Eu3+, YAG: Ce3+ and YAG: Tb3+ phosphors at low temperature, respectively. Effects of the heating temperature and the doping concentration of the YAG nano-sized phosphor were evaluated. MOCVD (metal organic chemical vapor depositi...学位：理学硕士院系专业：化学化工学院化学系_有机化学学号：20042504

Synthesis of ultrafine spherical YAG : Eu3+ phosphors by MOCVD

KeyWords Plus: YAG-TB PHOSPHOR; LUMINESCENT PROPERTIES; COMBUSTION PROCESS; SPRAY-PYROLYSIS; CE PHOSPHOR; PHOTOLUMINESCENCE; PARTICLES; MORPHOLOGY; POWDERS 通讯作者地址: Zeng, RJ (通讯作者), Xiamen Univ, Coll Mat Sci, Sinning S Rd 22, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Mat Sci, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] Europium-doped yttrium aluminum garnet (YAG:Eu3+) phosphor powders, with uniform diameters of about 1 mu m, have been prepared by metallorganic chemical vapor deposition (MOCVD). The metal-organic precursors have been characterized by thermogravimetry-differential scanning calorimeter (TG-DSC). The phosphor powders have been identified by X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence measurements. It shows that the YAG:EU3+ particles annealed at 1473 K for 3 h are nonaggregated and spherical, the diameter of particles is in the range of 1-2 mu m. Phase-pure YAG which is of spherical shaped particles have been obtained and observed good luminescence property. Three major emission peaks were observed at 589, 594, and 607 nm

钇铝石榴石制备方法

申请号：200610076992.1 申请日：2006.04.14 名称： 钇铝石榴石制备方法 公 开 (公告) 号：CN1844305 公开(公告)日：2006.10.11 主 分类号：C09K11/80(2006.01)I 分类号：C09K11/80(2006.01)I 申请(专利权)人：厦门大学 地址：361005福建省厦门市思明南路422号 发 明 (设计)人：曾人杰;肖清泉;黄 勇 专利代理 机构：厦门南强之路专利事务所 代理人：马应森钇铝石榴石制备方法，涉及一种荧光粉的制备工艺，尤其是涉及一种铕激活的钇铝石榴石制备工艺。提供一种采用高分子网络凝胶法，不必球磨，无团聚或少团聚，可直接用于封装，能最大限度地发挥其光学性能，无环境污染，节约成本的钇铝石榴石制备方法。将硝酸铝、柠檬酸、硝酸钇和硝酸铕加入容器中，加入去离子水，以氨水调节pH值到中性，恒温水浴，加入丙烯酰胺和N，N-亚甲基双丙烯酰胺，恒温水浴至丙烯酰胺和N，N-亚甲基双丙烯酰溶解，加入四乙基乙二胺和双氧水的水溶液引发聚合，恒温水浴得YAG的高分子网络凝胶，再经热处理除去水分和有机物，硝酸盐热分解为相应的氧化物，得预烧处理的粉末，再经高温热处理进行晶化，得YAG粉末

Synthesis of YAG:Tb~(3+) Phosphors by Polymer Gel Method at Low Temperature

陈都; 肖清泉; 陈朝; 曾人杰; 【作者英文名】 CHEN Du~1 XIAO Qing-quan~1 CHEN Chao~2 ZENG Ren-jie~1 （1.College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005; China; 2.College of Physics and Mechanical & Electrical Engineering; China）; 【作者单位】 厦门大学 化学化工学院材料科学与工程系; 厦门大学物理与机电工程学院 物理系; 厦门大学 化学化工学院材料科学与工程系 福建 厦门; 福建 厦门; 【文献出处】 发光学报, Chinese Journal of Luminescence, 编辑部邮箱 2007年 05期[中文摘要]以金属硝酸盐为原料,丙烯酰胺为聚合单体以及N,N-亚甲基双丙烯桥酰胺为胶联剂,采用高分子网络凝胶法在低温下合成精细粒度Y_3Al_5O_(12):Tb~(3+)(YAG:Tb~(3+))荧光粉。分别用热重-差热分析(TG-DTA)、X射线衍射(XRD)、扫描电子显微镜(SEM),以及激发和发射光谱测量对样品进行了表征,考察了烧结温度对样品结晶程度、颗粒大小的影响,以及样品发光性能与烧结温度和Tb~(3+)浓度的关系。结果表明:YAG晶相形成温度为850℃;粉体颗粒大小均匀,随着烧结温度的升高,颗粒粒径增大,结晶程度提高;观察到Tb~(3+)中4f-5d的吸收带以及~5D_4-~7F_j(j=6,5,4,3)的特征发射带,最强吸收与最强发射分别发生在272,541.8 nm,与量子理论(E=1.24/λ)的计算结果相吻合,其发光强度随烧结温度的升高而增强;观察到了Tb~(3+)在Y_3Al_5O_(12)中的浓度猝灭现象。 [英文摘要]Using acrylamide (CH_2=CHCONH_2) to form long chains of polyacrylamide and a cross-linker N′,N′-methylenebisacrylamide (CH_2=CHCONHCH_2NHCOCH=CH_2) to achieve tangled network,hydro- gen peroxide (H_2O_2) as initiator and N,N,N′,N′-tetramethylethylenediamide [(CH_3)_2 NCH_2 CH_2 N (CH_3)_2] as activator,we have successfully prepared the precursor from nitrates (aluminum nitrate,yttrium nitrate,and terbium nitrate),the precursor was subsequently heat-treated from 700℃to 1 400℃for 4 h to form terbium- doped yt..

Development of a droplet-interfaced high performance liquid chromatography-capillary electrophoresis two dimensional separation platform

蛋白质组体系的高度复杂性需要更高分辨率的多维分离技术。近年兴起的液滴技术在微纳尺度样品操控方面具有微体积、低扩散、无返混等独特优势,有望为多维分离平台的接口提供解决方案。通过采用不同结构的液滴微流控芯片可以实现“液滴生成“与“油相排除“功能,进行样品由连续流-非连续流-连续流的高效转移,将不同的分离模式进行二维耦联。本研究利用液滴作为接口技术耦联高效液相色谱与毛细管电泳构建二维分离系统,以蛋白质降解的复杂多肽混合物为样品,考察了液滴接口二维分离平台的可行性和有效性,并获得3 000以上的峰容量,初步展示了该接口技术在多维分离分析领域的应用潜力。Proteomics demands high resolution multidimensional separation techniques due to its extremely high complexity.Droplet microfluidics provides a series of unique advantages in manipulating micro and nanolitre samples,such as micro-volume operation,limited diffusion and none cross-contaminating,therefore has the potential to be an ideal interface strategy for multidimensional separation.Using the microchips of different structures,functions such as "droplet generation" and "oil depletion" can be realized.Based on these functions,samples can be transferred from continuous flow to segmented flow and then back to continuous flow.In this way,different separation modes can be combined.In this study,droplet technology was utilized as a novel interface strategy in combining high performance liquid chromatography(HPLC) and capillary electrophoresis(CE).Using tryptic peptides mixture as a sample,this two dimensional HPLC-CE system provided high resolution separation with a peak capacity over 3 000.This proof-of-principle study has demonstrated the usefulness of droplet interface technology in multidimensional separation.国家自然科学基金项目(No.21005065);教育部高等学校博士点专项科研基金项目(No.20100121120006

草鱼呼肠孤病毒新分离株(GCRV_(991))的病毒学特性分析

从湖南长沙分离到一株致病性强的草鱼呼肠孤病毒 (GCRV991) ,该病毒能使草鱼CIK ,肥头鲤FHM细胞产生明显的CPE ,对水生动物BF2 ,EPC及哺乳动物BHK ,VERO细胞株不敏感。中和实验显示 ,GCRV873 抗体能有效地中和GCRV991病毒颗粒 ,形成抗原抗体免疫复合物。纯化的病毒核酸与蛋白经SDS PAGE分离 ,分别呈现 11条清晰的核酸带及 5条主要与 2条微量结构多肽图谱 ,其核酸蛋白分子量大小与GCRV873 相近似。该毒株基因组总分子量为 14.48× 10 6kD ,

Preparation and characterization of nanometer sized TiO_2 thin film sintered at low temperature

[中文文摘]采用改进的溶胶-凝胶法令TiO2在普通玻璃载玻片表面浸渍提拉成膜,再经150℃热处理15min。用阶梯厚度仪、XRD、SEM、XPS、AFM、UV-vis吸收光谱和降解亚甲基蓝实验对所成薄膜的厚度、晶粒大小、表面形貌、吸光性和光催化性能进行了表征。研究结果表明:薄膜为类微晶玻璃态,其纳米粒子晶型为单一锐钛矿型,粒径在10~50nm,薄膜表面均匀、致密,具有良好紫外-可见吸收性和光催化活性。[英文文摘]The TiO2 thin film prepared by an improved sol-gel processing and then dip-coating on a glass substrate was sintered at 150℃ for 15min.The grain size,the thickness,the surface property,and the absorbency in UV-vis spectra of the film were characterized by a surface profile and methods of X-ray diffraction,scanning electron microscopy,atomic force microscopy,X-ray photoelectron spectroscopy,UV-vis spectrophotometry and decomposition of methylene bule.The film is identified as pure anatase,the grain size is around 10-50nm and t he surface of t he film is even and compact , the film shows high light absorption in UV-vis spectra and has high photocatalytic decomposition rates of met hylene bule.国家自然科学基金资助项目(50472057

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel