| ZnAl2O4:Mn材料的制备及发光性能 |
| Preparation and luminescent properties of ZnAl2O4:Mn materials |
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| 摘要: 以共沉淀法与煅烧法联用,成功制备了一系列ZnAl2O4: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ZnAl2O4中[AlO6]的八面体位可以有效被Mn4+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Mn4+在ZnAl2O4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Mn4+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+、Ca2+、Sr2+、Sn2+和Ga3+)与Mn4+共掺杂进入ZnAl2O4基质中,其中效果较突出的为Li+和Ga3+,其共掺杂使Mn4+发光强度分别增强0.6倍和1倍。 |
| 关键词: 共沉淀-煅烧 ZnAl2O4:Mn 红光发射 共掺杂 发光性能 |
| 基金项目: 国家自然科学基金(No.22265024，21763021)和内蒙古自治区自然科学基金(No.2020MS02014)资助。 |
| Abstract: In this work, a series of ZnAl2O4: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 ZnAl2O4 with spinel structure can be effectively replaced by Mn4+. The photoluminescence excitation (PLE) spectra and photoluminescence emission (PL) spectra of ZnAl2O4:xMn with varying Mn4+ doping concentrations (molar ratios of Mn to Al) were investigated. The crystal structure of host material ZnAl2O4 is conducive to effective luminescence of Mn4+ at 680 nm. The optimum doping concentration of Mn4+ 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 Mn4+, seven metal ions (Li+, Na+, K+, Ca2+, Sr2+, Sn2+, and Ga3+) were co-doped with Mn4+ into the ZnAl2O4 crystal structure. PL spectra indicated that the co-doping effect could remarkably enhance the luminescent intensity of Mn4+. The relative prominent co-doping of Li+ and Ga3+ with Mn4+ enhanced the luminous intensity of Mn4+ by 0.6 times and doubled, respectively. Furthermore, the concentration quenching of Mn4+ is delayed. |
| Keywords: coprecipitation-calcination ZnAl2O4:Mn red light emission co-doped luminescent properties |
| 投稿时间：2022-10-13 修订日期：2023-04-21 |
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| 吕莉,刘琳,韩梅杏,杨慧君,刘会影.ZnAl2O4:Mn材料的制备及发光性能[J].无机化学学报,2023,39(6):1113-1121. |
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