碱金属共掺MgSc2O4∶Er^3+/Yb^3+纳米晶的上转换发光性能  

Upconversion Luminescence of MgSc2O4∶Er^3+/Yb^3+Nanocrystals Co-doped Alkali Ions

作　　者：袁美娟 李静 秦慧连 彭亚茹 黄宇欣 陈力[1,2] YUANG Mei-juan;LI Jing;QIN Hui-lian;PENG Ya-ru;HUANG Yu-xin;CHEN Li(School of Chemistry and Life Science&Advanced Institute of Materials Science,Changchun University of Technology,Changchun 130012,China;School of Materials Science and Engineering,Changchun University of Technology,Changchun 130012,China)

机构地区：[1]长春工业大学化学与生命学院&材料科学高等研究院,吉林长春130012 [2]长春工业大学材料科学与工程学院,吉林长春130012

出　　处：《发光学报》2020年第11期1351-1357,共7页Chinese Journal of Luminescence

基　　金：国家自然科学基金(11504029,11474035);吉林省教育厅“十三五”科学技术项目(JJKH20200646KJ);吉林省自然科学基金(20200201247JC,20170520110JH)资助项目。

摘　　要：通过水热法制备了碱金属离子(Li^+、Na^+、K^+)共掺的MgSc2O4∶Er^3+/Yb^3+纳米晶,获得类球状纳米晶的平均尺寸约为35 nm。通过改变碱金属离子的种类和数量,获得了增强上转换发光。发现K+离子共掺MgSc2O4∶Er^3+/Yb^3+纳米晶发光强度最佳,并且随着K^+掺杂量的不断增加,纳米晶的发射强度逐渐增强,这是由于K^+离子引入了最大的晶体场不对称性。随后,通过调控Yb^3+和Er^3+的掺杂浓度,发现发光强度最强样品为K^+离子共掺MgSc2O4∶1%Er^3+/5%Yb^3+纳米晶。研究了在980 nm激光激发下,MgSc 2O 4纳米晶中Yb^3+与Er^3+离子之间的能量传递以及上转换发光机制。The alkali ions(Li^+/Na^+/K^+)co-doped MgSc2O4∶Er^3+/Yb^3+nanocrystals have been synthesized by hydrothermal method.The average size of obtained spheroid nanocrystals is about 35 nm.The upconversion luminescence intensity can be strengthened by adjusting alkali ions types and contents.The K+ions co-doped MgSc2O4∶Er^3+/Yb^3+nanocrystals display the strongest luminescence.As K+content increasing,emission intensity can be enhanced gradually due to the large asymmetry of crystal field created by K+ions.The spectral properties of K^+ions co-doped MgSc2O4∶Er^3+/Yb^3+nanocrystals are described in detail as a function of Er 3+and Yb 3+concentrations.The MgSc2O4∶1%Er^3+/5%Yb^3+nanocrystal was optimized for the strongest upconversion luminescence.Then,the upconversion mechanism and energy transfer processes between Yb^3+ions and Er 3+ions in K+ions co-doped MgSc2O4∶Er^3+/Yb^3+nanocrystals were investigated under the 980 nm excitation.

关 键 词：上转换发光 稀土离子 碱金属 水热法 MgSc2O4 

分 类 号：O482.31[理学—固体物理]