Directly imaging of the atomic structure of luminescent centers in CaYAlO_(4):Ce^(3+)

查看全文 作　　者：Yalong [1]Zhai;Xuewei [1]Yang;Shu-Na [4]Zhao;Pei [3]Liu;Jun [2]Lin;Yang [1]Zhang 机构地区：[1]School of Materials Science and Engineering,Center of Advanced Analysis&Gene Sequencing,Zhengzhou University,Zhengzhou 450001,China;[2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;[3]DTU Nanolab.Technical University of Denmark,Fysikvej,2800 Kgs.Lyngby,Denmark;[4]Green Catalysis Center and College of Chemistry,Zhengzhou University,Zhengzhou 450001,China 出　　处：《Nano Research》索引2023年第16卷第2期,共6页 基　　金：funded by the National Natural Science Foundation of China(Nos.52002357,22105175,and 51932009);P.L.acknowledges the financial support from the Carlsberg Foundation(No.CF20-0612). 摘　　要：Lanthanides(Ln^(3+))doped luminescent materials play critical roles in lighting and display techniques.While increasing experimental and theoretical research have been carried out on aluminate-based phosphors for white light-emitting diodes(WLEDs)over the past decades,most investigation was mainly focused on their luminescent properties;therefore,the local structure of the light emission center remains unclear.Especially,doping-induced local composition and structure modification around the luminescent centers have yet to be unveiled.In this study,we use advanced electron microscopy techniques including electron diffraction(ED),high-resolution transmission electron microscopy(HRTEM),high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM),in combination with energy dispersive X-ray spectroscopy(EDX)and electron energy loss spectroscopy(EELS),to reveal atomically resolved crystalline and chemical structure of Ce^(3+)doped CaYAlO4.The microscopic results prove substantial microstructural and compositional inhomogeneities in Ce^(3+)doped CaYAlO_(4),especially the appearance of Ce dopant clustering and Ce^(3+)/Ce^(4+)valence variation.Our research provides a new understanding the structure of Ln^(3+)doped luminescent materials and will facilitate the materials design for next-generation WLEDs luminescent materials. 关 键 词：LUMINESCENT white light-emitting diodes(WLEDs) rare earth element atomic structure chemical structure