ZnAl_(2)O_(4):Mn材料的制备及发光性能  

Preparation and luminescent properties of ZnAl_(2)O_(4):Mn materials

作　　者：吕莉[1] 刘琳 韩梅杏 杨慧君 刘会影 LÜLi;LIU Lin;HAN Mei‑Xing;YANG Hui‑Jun;LIU Hui‑Ying(Institute of Chemical Technology,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学化工学院,呼和浩特010051

出　　处：《无机化学学报》2023年第6期1113-1121,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.22265024,21763021);内蒙古自治区自然科学基金(No.2020MS02014)资助。

摘　　要：以共沉淀法与煅烧法联用,成功制备了一系列ZnAl_(2)O_(4):xMn样品。通过扫描电镜和X射线粉末衍射测试研究了样品的形貌和物相特征,结果表明尖晶石结构的ZnAl_(2)O_(4)中[AlO_(6)]的八面体位可以有效被Mn^(4+)替代。通过荧光激发和发射光谱研究了样品的发光性能,发现Mn^(4+)在ZnAl_(2)O_(4)体系中掺杂可以显示出明亮的红色发光(发射峰值位于680 nm处)。比较不同Mn^(4+)浓度(Mn与Al的物质的量之比)掺杂样品的发光强度时发现,Mn4+最佳掺杂浓度为0.06%。通过德克斯特公式分析了发光强度与浓度关系,探究浓度猝灭机制,结果表明最邻近离子之间能量传递造成Mn4+浓度猝灭的发生。为了提高Mn4+的发光强度,选择了7种金属离子(Li^(+)、Na^(+)、K^(+)、Ca^(2+)、Sr^(2+)、Sn^(2+)和Ga^(3+))与Mn^(4+)共掺杂进入ZnAl_(2)O_(4)基质中,其中效果较突出的为Li^(+)和Ga^(3+),其共掺杂使Mn^(4+)发光强度分别增强0.6倍和1倍。In this work,a series of ZnAl_(2)O_(4):xMn samples were successfully prepared by the co-precipitation and calcination methods.The micrographs and phases of powders were analyzed by scanning electron microscopy and X-ray diffraction,respectively.The octahedral position of[AlO6]in ZnAl_(2)O_(4)with spinel structure can be effectively replaced by Mn4+.The photoluminescence excitation(PLE)spectra and photoluminescence emission(PL)spectra of ZnAl_(2)O_(4):xMn with varying Mn4+doping concentrations(molar ratios of Mn to Al)were investigated.The crystal structure of host material ZnAl_(2)O_(4)is conducive to effective luminescence of Mn^(4+)at 680 nm.The optimum doping concentration of Mn^(4+)was 0.06%.The relationship between luminescence intensity and concentration was analyzed by the Dexter formula to explore the mechanism of concentration quenching.The energy transfer among the nearest neighbor ions leads to concentration quenching.To further improve the luminous intensity of Mn^(4+),seven metal ions(Li^(+),Na^(+),K^(+),Ca^(2+),Sr^(2+),Sn^(2+),and Ga^(3+))were co-doped with Mn4+into the ZnAl_(2)O_(4)crystal structure.PL spectra indicated that the co-doping effect could remarkably enhance the luminescent intensity of Mn^(4+).The relative prominent co-doping of Li+and Ga^(3+)with Mn4+enhanced the luminous intensity of Mn^(4+)by 0.6 times and doubled,respectively.Furthermore,the concentration quenching of Mn^(4+)is delayed.

关 键 词：共沉淀-煅烧 ZnAl_(2)O_(4):Mn 红光发射 共掺杂 发光性能 

分 类 号：TB34[一般工业技术—材料科学与工程]