联系我们  |  网站地图  |  English   |  移动版  |  中国科学院 |ARP
站内搜索:
首页 简介 管理部门 科研部门 支撑部门 研究队伍 科研成果 成果转化 研究生教育 党建与创新文化 科普 信息公开 OA系统
学术活动
“会聚”时代的人工晶体讲...
Energy Research & High I...
弛豫铁电材料高压电效应的...
计算含能材料学面临的挑战
青年创新促进会学术交流会议
面向高比能水系可充电锌-...
东生讲坛第4期-分子材料聚...
Bio-inspired MEMS transd...
表面科学和先进表征技术在...
Polymer Nanocomposite Di...
Inorganic chalcogenide s...
“会聚”时代的人工晶体讲...
Materials Today Publishi...
集成计算中心计算所创新项...
东生讲坛第3期-取向组装诱...
现在位置:首页>新闻动态>学术活动
Eu2+ stabilization in YAG structure
2018-01-19 16:19:46 | 【 【打印】【关闭】

SEMINAR

Transparent Ceramics Research Center, SICCAS

Key Laboratory of Transparent Opto-fuctional Inorganic Materials, CAS

中国科学院上海硅酸盐研究所透明陶瓷研究中心

中国科学院透明与光功能无机材料重点实验室

 

Eu2+ stabilization in YAG structure

 

Speaker

Dr. Eva Mihokova

Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic

 

 

时间:1129日(星期三)10:00 AM

地点:嘉定园区F4楼会议室

联系人:李江(69163689

 

Abstract:

A set of Eu-doped Y3Al5O12 (YAG) phosphors in the powder form was synthesized by multiple-step solid state reaction under the reducing Ar:5%H2 atmosphere. We investigate their physical properties by means of X-ray diffraction, time-resolved luminescence spectroscopy and electron paramagnetic resonance (EPR). Our focus is put on well-grounded confirmation of Eu2+ occurrence in the YAG structure.

X-ray diffraction confirmed the presence of major YAG phase in all samples. We study the influence of Eu concentration, form of doping (EuS, EuF2 or Eu2O3) and a number/form of annealing steps. Corresponding characteristics were measured and evaluated in a broad temperature range (8 – 800 K). The correlated measurements show that the single Eu2+ ions stabilized in YAG in the yttrium position are responsible for the 440 nm emission. The corresponding lowest energy excitation band is situated at 300 nm and the radiative lifetime of Eu2+ emission is about 500 nanoseconds. Phenomenological model of excited state dynamics was used to explain the experimentally observed features. We also study the presence od trapping centers in YAG:Eu samples by thermally stimulated luminescence and evaluate their principal characteristics. We discuss possible practical exploitation of Eu2+ center in the YAG host.

 

Dr. Eva Mihokova is a leading senior scientist in the Institute of Physics, Czech Academy of Sciences in Prague Czech Republic. She studied at the faculty of Mathematics and Physics of the Charles University in Prague, Czech Republic where she received her Master degree. She received her PhD degree in the Institute of Physics Czech Academy of Sciences in Prague Czech Republic. In last years, Eva Mihokova studies optical properties of scintillating materials with wide spectrum of applications. Her research focuses on processes related to luminescence and scintillation mechanisms, their interpretation and numerical modelling. Within methods of characterization of material systems in the form of single crystals, nanopowders and nanocomposites she specializes particularly in investigation of defects and trapping centers by thermally stimulated luminescence technique.

She is an author and coauthor of about 200 scientific papers in international peer-reviewed journals and 1 book chapter. Her publications received more than 3700 citations (excluding selfcitations), H index 33. She was a principal investigator in about 10 domestic and international projects and a research team member in about other twenty. She was awarded the Prize of Academy of sciences of the Czech Republic for excellent scientific results, “PbWO4 single crystals- scintillator for high energy physics. Physical description and material optimization” and The Prize of “Otto Wichterle” of the Academy of Sciences of the Czech republic.

 

版权所有 中国科学院上海硅酸盐研究所 沪ICP备05005480号-1
长宁园区地址:上海市长宁区定西路1295号 电话:86-21-52412990 传真:86-21-52413903 邮编:200050
嘉定园区地址:上海市嘉定区和硕路585号  电话:86-21-69906002 传真:86-21-69906700 邮编:201899