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王笑军教授(Georgia Southern University)学术讲座

2019-05-13 17:26:11  点击:[]

巴渝海外引智计划项目”学术活动

报告题目:Effects of Nanocaged Ions on the Emission Centers in Calcium Aluminates

报告人:王笑军 教授 Georgia Southern University

主持人:李波 院长

时间:2019.05.15(星期三)上午9:00

地点:理学院 学术报告厅 (至善楼200

组织单位:国际合作与交流处 理学院

承办单位:理学院

内容简介:

Rare earth (RE) doped calcium aluminates (12CaO·7Al2O3 or C12A7) phosphors have been prepared and treated under different conditions to trap different anions in the nanocages of C12A7. The effects of the nanocaged anions on the optical spectroscopies of the RE doped C12A7 phosphors, including photoluminescence and color tuning, upconverted emissions, cathodoluminescence, and X-ray storage, have been investigated. Electron paramagnetic resonance (EPR) spectra are also studied in combination with the optical spectra. Crystal field modification of RE emission centers by the encaged anions is observed by both photoluminescence and electron paramagnetic resonance. A relationship between the ratio of green to red upconverted emissions of Er3+ and the amount of encaged OH�� anions is established and the concentration of the OH- determined. Emission enhancement in C12A7:Ce3+,Tb3+ conductive phosphors is realized by a multiphase strategy, which has a potential application in field emission devices. Color tuning of C12A7:Eu3+/Eu2+ phosphor is also performed in the range from red to blue by controlling the sort and amount of encaged anions. Improvement of X-ray storage properties of C12A7:Tb3+ photostimulable phosphors through controlling the encaged anions will also be discussed.

报告人简介:

王笑军是美国南佐治亚大学终身教授2002年入选中科院百人计划,后曾担任东北师范大学(东师学者)、吉林大学(唐敖庆讲座)、中科院长春光机所等单位的客座教授。主持或者共同主持了包括美国橡树岭国家实验室/能源部研究基金、美国3M 公司研究基金、美国Cottrell 科学基金、美国国家健康总署(National Institutes of Health)基金、国家863 计划(半导体照明工程重大项目)、国家自然科学基金等10余项课题,参研了国家自然科学基金重点课题等项目。撰写出版4部专著章节,谷歌学术搜索引用4500余次;在物理评论快报(Phys. Rev. Lett.),物理评论(Phys. Rev. B),应用物理快报(Appl. Phys. Lett)等期刊发表论文200余篇,引用7800余次(h-index=48)。王笑军教授自2004年至今任国际发光大会程序委员会委员及多个发光、发光材料研究领域的国际学术组织委员,目前担任Nature出版社Light: Science & Applications期刊编辑,Elsevier出版社Materials Research Bulletin期刊副主编,是发光学报,中国光学,Journal of Rare Earths/中国稀土学报编委等。