Zhou Wei, Li Cheng, Wu Tong, Liu Runze, Ding Zhiling, Zhang Ruiling, Yu Yang, Han Peigeng, Lu Ruifeng
Institute of Ultrafast Optical Physics, Department of Applied Physics and MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, P. R. China.
J Phys Chem Lett. 2023 Sep 28;14(38):8577-8583. doi: 10.1021/acs.jpclett.3c02070. Epub 2023 Sep 19.
Inorganic halide double perovskite (DP) nanocrystals (NCs) have attracted great attention because of their nontoxicity, mild reaction conditions, good stability, and excellent optical and optoelectronic properties. Herein, we prepare the inorganic terbium halide DP CsBTbCl (B = Na or Ag) NCs with bright green photoluminescence (PL) emission. The Na-Tb-based DP NCs exhibit better PL properties compared with the Ag-Tb-based DP NCs, which is due to CsNaTbCl NCs having a more localized charge carrier distribution on the [TbCl] octahedron. The incorporation of Sb dopant in CsNaTbCl NCs can construct a more efficient energy transfer process, resulting in a doubling of PL efficiency. Furthermore, CsNaTbCl: Sb NCs possess excellent X-ray scintillating performance with a low-dose detection limit of 140 nGy/s, which is nearly 5 times more sensitive than the undoped NCs. The optimized NCs show great application prospects in X-ray imaging. This work helps deepen the understanding of the luminescence mechanism, excited state dynamics, and scintillation property in Tb-based DP NCs.
无机卤化物双钙钛矿（DP）纳米晶体（NCs）因其无毒、反应条件温和、稳定性好以及优异的光学和光电性能而备受关注。在此，我们制备了具有亮绿色光致发光（PL）发射的无机卤化铽DP CsBTbCl（B = Na或Ag）NCs。与基于Ag-Tb的DP NCs相比，基于Na-Tb的DP NCs表现出更好的PL性能，这是因为CsNaTbCl NCs在[TbCl]八面体上具有更局域化的电荷载流子分布。在CsNaTbCl NCs中掺入Sb掺杂剂可以构建更高效的能量转移过程，从而使PL效率提高一倍。此外，CsNaTbCl:Sb NCs具有优异的X射线闪烁性能，低剂量检测限为140 nGy/s，比未掺杂的NCs灵敏度高近5倍。优化后的NCs在X射线成像中显示出巨大的应用前景。这项工作有助于加深对基于Tb的DP NCs的发光机制、激发态动力学和闪烁特性的理解。
