微波驱动后合成掺杂制备CsPbCl3:Mn^2+钙钛矿纳米晶

Preparation of CsPbCl3:Mn^2+ Perovskite Nanocrystals by Microwave-driven Post-synthesis Doping

无机铅卤钙钛矿CsPbCl3因具有优异的光学性能而得到广泛研究,但是铅的毒性极大地限制了钙钛矿的发展及应用。针对替代CsPbCl3钙钛矿材料中的铅离子及发光调控等问题,利用微波驱动后掺杂法制备了CsPbCl3:Mn^2+钙钛矿材料,探究了不同Mn^2+离子掺杂量对材料的晶体结构、形貌及荧光光谱等的影响。试验结果表明,随着Mn^2+掺杂浓度的增加,纳米晶的形貌愈发规整,分散性也愈佳,而晶粒尺寸略有减少,这可能是由于CsPbCl3的晶格收缩引起的。此外,研究结果还发现,掺杂Mn^2+有助于减少钙钛矿材料的缺陷,~600 nm处激子发光峰强度随掺杂浓度增加逐渐增强。所有结果表明,采用微波驱动后合成掺杂法能够成功制备CsPbCl3:Mn^2+纳米晶,且掺杂Mn^2+能够有效改善CsPbCl3纳米晶的发光性能。

Inorganic lead halide perovskite CsPbCl3 has been widely studied for its excellent optical properties,but the toxicity of lead has greatly restricted the development and application of perovskite.The thesis aims at the problems of replacing lead ions in CsPbCl3 perovskite materials and the regulation of luminescence,the CsPbCl3:Mn^2+perovskite material is prepared by the microwave-driven post-synthesis doping method,and the effects of different doping amounts of Mn^2+ions on the crystal structure,morphology and fluorescence spectrum of the materials are investigated.The experimental results show that with the increase of the Mn^2+doping concentration,the morphology of the nanocrystals becomes more regular and the dispersibility is better,while the grain size is slightly reduced,which may be caused by the lattice shrinkage of CsPbCl3.In addition,the research results also found that doping Mn^2+helps reduce defects in perovskite materials.The intensity of exciton emission peaks at^600 nm gradually increases with increasing doping concentration.The results show that the CsPbCl3:Mn^2+nanocrystals can be successfully prepared by the microwave-driven post-synthesis doping method,and the doped Mn^2+can effectively improve the luminescent properties of CsPbCl3 nanocrystals.