Warm white-light emitting silica films prepared using lead-free double perovskite QDs
Warm white-light emitting silica films prepared using lead-free double perovskite QDs
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使用无铅双钙钛矿量子点制备暖白光发射二氧化硅薄膜
DOI：
10.1039/d1dt01325d
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发表时间：
2021
影响因子：
4
通讯作者：
Xiaoqiang Yu
中科院分区：
文献类型：
--
作者：
Zexin Li;Fenglei Sun;Haining Song;Haifeng Zhou;Yifei Zhou;Zhenlei Yuan;Peng Guo;Guanjun Zhou;Qianqian Zhuang;Xiaoqiang Yu
无铅双钙钛矿因其良好的稳定性和无毒性而受到广泛关注。在这项工作中，使用无毒前体通过热注射方法合成了 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，并且具有较大的斯托克斯位移。立方钙钛矿空间群为Fmm，立方结构中交替出现[NaCl6]、[AgCl6]和[InCl6]八面体。通过掺杂少量Bi提高了Cs2AgxNa1−xInCl6的光致发光量子产率； PL QY 增加到 57.3%，在 600 nm 处有明显的发射峰。通过SiO2涂层进一步增强了钙钛矿量子点的稳定性和发光强度，并使用全氢聚硅氮烷作为前驱体制备了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。
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 Fmm, 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.