摘要
采用水热合成法制备了八面体结构纳米CeO2∶Er^3+,并研究了稀土Er^3+离子掺杂对CeO2纳米晶的结构以及发光特性的影响。所合成的CeO2纳米晶具有八面体结构,结晶完好,粒度均匀。XRD和拉曼光谱测试结果表明所制备的CeO2纳米晶为面心立方萤石结构,稀土Er^3+离子的掺杂在基质晶格中产生了氧空位缺陷,并产生了晶格畸变。在980 nm激光激发下产生了稀土Er^3+离子绿色(2H11/2,4S3/2→4I15/2)、红色(4F9/2→4I15/2)和近红外(4I11/2,4I13/2→4I15/2)发光。随着稀土Er^3+离子掺杂浓度的变化,样品的发光光谱在可见光和近红外光范围产生了不同的猝灭浓度,这是由于掺杂浓度变化对Er^3+-Er^3+之间的交叉驰豫过程产生了影响,Er^3+的能级布居变化引起了发光特性的改变。
Octahedral CeO2∶Er^3+nanophosphors with uniform crystallinity and fine crystalline were prepared using hydrothermal method.The structural and emission properties were investigated.The XRD and Raman spectra indicated that the as-prepared CeO2∶Er^3+samples were cubic fluorite structure of CeO2 phase,and the oxygen vacancies were produced due to the substitution of Er^3+for Ce4+.Green(2H11/2,4S3/2→4I15/2),red(4F9/2→4I15/2)and NIR(4I11/2,4I13/2→4I15/2)emissions under 980 nm laser diode excitation were also investigated,and they were strong affected by the doping concentration of Er^3+.Different quenching concentrations are observed in the visible and NIR emission spectra,which is due to the alteration of populating channels in the cross relaxation processes of Er^3+.
作者
张慧敏
丛妍
佟尧
杨扬
王月
任柏宇
董斌
ZHANG Hui-min;CONG Yan;TONG Yao;YANG Yang;WANG Yue;REN Bo-yu;DONG Bin(Key Laboratory of Photosensitive Material & Device of Liaoning Province Key Laboratory of Photosensitive Material & Device of Liaoning Province, Key Laboratory of New Energy & Rare Earth Resource Utilization of State Ethnic Affairs Commission, School of Physics & Materials Engineering, Dalian Minzu University, Dalian 116600, China;State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2020年第4期386-391,共6页
Chinese Journal of Luminescence
基金
国家自然科学基金(11974069)
辽宁省自然科学基金(20170540200,20180550070)
兴辽英才计划(XLYC1902113)
中央高校基本科研业务费专项资金(0220-110010)
大连民族大学大学生创新创业训练计划(201912026055)
大连民族大学“太阳鸟”学生科研项目(tyn2019295,2019296)资助。
