Effective regulation of electronic structures and luminescence properties of LiGd_(9)(SiO_(4))6-x(GeO_(4))xO_(2):Dy^(3+)phosphors by tetrahedral substitution  

作　　者：Yuanyuan Zhang Lefu Mei Haikun Liu Sergey M.Aksenov Dina V.Deyneko Deliang Chen 

机构地区：[1]School of Materials Sciences and Technology,Dongguan University of Technology,Dongguan 523808,China [2]School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China [3]Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes,National Laboratory of Mineral Materials,School of Materials Sciences and Technology,China University of Geosciences,Beijing 100083,China [4]Department of Energy and Chemical Engineering,Dongguan University of Technology,Dongguan 523808,China [5]Laboratory of Arctic Mineralogy and Material Sciences,Kola Science Centre,Russian Academy of Sciences,14 Fersman Str,Apatity,184209,Russia [6]Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic,Kola Science Centre,Russian Academy of Sciences,Apatity,18420 Russia [7]Department of Chemistry,Lomonosov Moscow State University,Moscow,119991,Russia [8]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Journal of Rare Earths》2023年第5期673-681,I0002,共10页稀土学报（英文版）

基　　金：supported by the Guangdong Basic and Applied Basic Research Foundation(2021A1515110283,2021A1515110702);the China Postdoctoral Science Foundation(2021M702562);the Research Start-up Funds of DGUT(211135307);the National Natural Science Foundation of China(51872269);the Key Scientific Research Project in Colleges and Universities of Henan Province of China(21A430040);the Natural Science Foundation of Guangdong Province(2018B030311022);Guangdong Innovation Research Team for Higher Education(2017KCXTD030)。

摘　　要：A series of Dy^(3+)-activated phosphors with the general formula LiGd_(9)(SiO_(4))6-x(GeO_(4))xO_(2):Dy^(3+)(0≤x≤3)characterized by an apatite-type structure were successfully synthesized via a simple solid-state technique involving a partial substitution of[SiO_(4)]^(4-)with[GeO_(4)]^(4-)species.The effects of homovalent[GeO_(4)]^(4-)-[SiO_(4)]^(4-)substitution on the crystal structure,electronic structure,luminescence properties and thermal performance of LiGd_(9)(SiO_(4))6-x(GeO_(4))xO_(2):Dy^(3+)phosphors were studied in details.The phases and microstructure were performed by using X-ray diffraction(XRD)Rietveld refinement method and scanning electron microscopy(SEM)characterization.The substitution of smaller[SiO_(4)]^(4-)ions by larger[GeO_(4)]^(4-)ones makes their unit cell parameters increase gradually,and their band gaps decrease.The photoluminescence spectra of LiGd_(9)(SiO_(4))6-x(GeO_(4))xO_(2):Dy^(3+)(0≤x≤3)exhibit obvious emission peaks located at 477,573 and 675 nm within a visible wavelength region,resulting in an excellent white light.Furthermore,the I573nm/I477nm values of LiGd_(9)(SiO_(4))6-x(GeO_(4))xO_(2):Dy^(3+)(0≤x≤3)become larger with the partial substitution of[SiO_(4)]^(4-)by[GeO_(4)]^(4-),and their CIE chromaticity coordinates exhibit a yellow shift.

关 键 词：APATITE Structure substitution Electronic structure White emitting Rare earths 

分 类 号：TQ422[化学工程]