【摘 要】
：
Er3+ and Li+ codoped Y3Al5O12 (YAG) powders were prepared for a systematic investigation of their upconversion emissions.X-ray diffraction (XRD),upconversion em
【机 构】
：
College of Electronic Science,Center for Condensed Matter Science and Technology(CCMST),Internationa
论文部分内容阅读
Er3+ and Li+ codoped Y3Al5O12 (YAG) powders were prepared for a systematic investigation of their upconversion emissions.X-ray diffraction (XRD),upconversion emission spectra,pump power dependence,FT-IR spectra and decay time were studied to characterize the samples.With Li+ doping,the upconversion emission intensity of Er3+ doped YAG powders was obviously enhanced,accompanied with an increase in the ratio of green to red intensity.The enhancement of emission intensity could be attributed to two mechanisms:one was the distortion of local crystal field around Er3+,and the other was the decrease in the amount of CO32- and OH- groups.Our results revealed that the latter was the dominant mechanism of the upconversion intensity enhancement in the YAG:Er3+/Li+ powders.
其他文献
研究十二烷基三甲基氯化铵(DTAC)和十六烷基三甲基氯化铵(CTAC)对一水硬铝石和高岭石的浮选行为.通过残余浓度法测定吸附等温线,荧光探针法和Zeta电位测试方法研究季铵型阳离
本文从探讨新时期住宅空间组合设计的原则出发，详细阐述了住宅空间组合设计的理念和功用。接着笔者又深入分析了住宅空间所包含的类型。最后，针对住宅空间组合设计问题，笔者做了
Nanoscale Lu2O3:Eu3+ phosphor was prepared by a modified solution combustion method using urea and acrylamide monomer.The particle sizes and photoluminescent pr
新形势下，大学生的就业核心竞争力是他们综合素质的集中体现，是让大学生在激烈的社会竞争中获取主动权的重要保障所在。因此，我们必须找到合适的路径来切实提升大学生就业核心竞
Nanoparticle of cerium borate with a size of about 50 nm was synthesized via sol-gel precipitation method under micro-emulsion by oleic acid,using Na2B4O7 and C
利用具有无坩埚、高稳定性等特性的光辐射悬浮区熔法,制各R2PdSi3(R=Pr,Yb和Gd)单晶.从原材料和试样制备过程、单晶生长过程、熔体内部以及单晶基体4个方面研究单晶制备过程
改革开放至今,我国经济实现了飞速的发展,从整体上看我国的经济正在朝着稳定的方向发展,之所以能取得这一优异成果与国内众多中小型企业的努力是分不开的。在我国各大中小企
建立AA2219铝合金搅拌摩擦焊接的工艺窗口.采用不同的工艺参数如旋转速度和焊接速度来焊接该铝合金.通过对焊接接头的宏观形貌分析,建立搅拌摩擦焊的工艺窗口.通过拉伸试验、
本文从探讨新时期医院规划设计的重要意义出发，详细阐述了医院规划设计中重要性和重要地位。接着笔者又深入分析了当前我国医院规划设计中的问题所在并就现代医院规划设计理念
Binary Ce-Zr (CZ),Pr-Zr (PZ) and ternary Ce-Zr-Pr (CZP) mixed oxides were prepared by an ammonia-aided co-precipitation method,and were aged in a steam/air flow