Li Zexin, Sun Fenglei, Song Haining, Zhou Haifeng, Zhou Yifei, Yuan Zhenlei, Guo Peng, Zhou Guangjun, Zhuang Qianqian, Yu Xiaoqiang
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China.
School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China.
Dalton Trans. 2021 Jul 21;50(28):9804-9811. doi: 10.1039/d1dt01325d.
Lead-free double perovskite has attracted widespread attention due to its good stability and non-toxicity. In this work, Cs2AgxNa1-xInCl6 quantum dots were synthesized via a thermal injection method using non-toxic precursors. Based on the wide spectrum of self-bound excitons, the quantum dots achieved white light emission. Bi-doped Cs2AgxNa1-xInCl6 quantum dots with excellent luminescence performance have the same cubic structure, and they have a larger Stokes shift. The cubic perovskite space group is Fm3[combining macron]m, and [NaCl6], [AgCl6] and [InCl6] octahedrons alternately appear in the cubic structure. The photoluminescence quantum yield of Cs2AgxNa1-xInCl6 is improved by doping with a small amount of Bi; the PL QY increased to 57.3% with an obvious emission peak at 600 nm. The stability and luminescence intensity of perovskite QDs were further enhanced by SiO2 coating and a Cs2AgxNa1-xInCl6:Bi-SiO2 thin film was prepared using perhydropolysilazane as the precursor. The materials have huge application potential in the field of white light emission and display.
无铅双钙钛矿因其良好的稳定性和无毒特性而备受广泛关注。在本工作中，采用无毒前驱体通过热注入法合成了Cs2AgxNa1-xInCl6量子点。基于自束缚激子的宽光谱，量子点实现了白光发射。具有优异发光性能的双掺杂Cs2AgxNa1-xInCl6量子点具有相同的立方结构，且具有较大的斯托克斯位移。立方钙钛矿空间群为Fm3[combining macron]m，[NaCl6]、[AgCl6]和[InCl6]八面体在立方结构中交替出现。通过掺杂少量Bi提高了Cs2AgxNa1-xInCl6的光致发光量子产率；PL QY提高到57.3%，在600 nm处有明显的发射峰。通过SiO2包覆进一步提高了钙钛矿量子点的稳定性和发光强度，并以全氢聚硅氮烷为前驱体制备了Cs2AgxNa1-xInCl6:Bi-SiO2薄膜。该材料在白光发射和显示领域具有巨大的应用潜力。
