绿色长余辉发光材料MgGa_(2)O_(4):Mn^(2+)的制备及性能研究  

Synthesis and long afterglow luminescent properties ofMgGa_(2)O_(4):Mn^(2+)green phosphors

作　　者：蔡鹏博 孟伟 张洪武 郑升辉 付晓燕 CAI Pengbo;MENG Wei;ZHANG Hongwu;ZHENG Shenghui;FU Xiaoyan(Key Laboratory of Functional Materials and Applications of Fujian Province,School of Materials Scienceand Engineering,Xiamen University of Technology,Xiamen 361024,China;School of Chemistry and Material Sciences,Ludong University,Yantai 264025,China;Institute of Urban Environment,CAS,Xiamen 361021,China)

机构地区：[1]厦门理工学院材料科学与工程学院,福建省功能材料及应用重点实验室,福建厦门361024 [2]鲁东大学化学与材料科学学院,山东烟台264025 [3]中国科学院城市环境研究所,福建厦门361021

出　　处：《功能材料》2022年第8期8176-8179,8230,共5页Journal of Functional Materials

基　　金：国家自然科学基金面上项目(11974013);国家自然科学基金促进海峡两岸科技合作联合基金项目(U2005212);福建省功能材料及应用重点实验室开发课题项目(fma2020009);厦门理工学院科研攀登项目(XPDKT19039)。

摘　　要：采用高温固相法合成了MgGa_(2)O_(4):x Mn^(2+)(x=0.5%,1%,3%,5%)系列绿色长余辉发光材料。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、发光光谱、余辉光谱、热释光谱等表征手段对其长余辉发光性能进行了研究。样品的发射光谱的结果表明,Mn^(2+)在509 nm处的特征发射峰,对应Mn^(2+)离子的^(4)T_(1)(4G)→^(6)A_(1)(^(6)S)电子跃迁,随着Mn^(2+)掺杂浓度的增加,其发光强度先增强后减弱,掺杂浓度为3%时样品具有最好的发光性能;掺杂浓度为1%时其余辉强度最强,余辉时间可以持续1h以上;热释光谱在342 K附近出现一个宽峰,这表明样品存在大量的陷阱,这有利于捕获被激发的电子,形成长余辉发光。The long afterglow green phosphors MgGa_(2)O_(4):x Mn^(2+)(x=0.5%,1%,3%,5%)series were synthesized by high temperature solid-state method in this paper.The long afterglow luminescent properties were investigated using X-ray diffraction(XRD),scanning electron microscopy(SEM),luminescent spectrum and thermoluminescent spectrum.The luminescent spectra consisted of the characteristic emission peak of Mn^(2+)at 509 nm,corresponding to the ^(4)T _(1)(4G)→^(6)A _(1)(^(6)S)electronic transition of Mn^(2+)ion and the optimal doping concentration was x=3%.The afterglow spectra of the samples were similar to the emission spectra,which were also located at 509 nm and can be ascribed to ^(4)T _(1)(4G)→^(6)A _(1)(^(6)S)electronic transition of Mn^(2+).At the same time,with the increase of doping concentration,the afterglow intensity first increased and then decreased and the doping concentration of 1%had the best afterglow performance.Furthermore,the green afterglow luminescence of the samples could persist for more than 1 h.And the thermoluminescence spectrum consisted of a wide peak at near 342 K,which was very suit to produce excellent long afterglow.

关 键 词：镓酸镁 Mn^(2+)掺杂 长余辉发光 陷阱 

分 类 号：O482.31[理学—固体物理]