School of Physical Science and Technology; State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures; School of Resources, Environments and Materials, Guangxi University, Nanning530004, China.
J Phys Chem Lett. 2023 Feb 16;14(6):1460-1469. doi: 10.1021/acs.jpclett.2c03287. Epub 2023 Feb 5.
With high photoluminescence efficiency and a simple solution synthesis method, lead halide perovskites are expected to be a promising material for display and illumination. However, the toxicity and environmental sensitivity of lead hinder its potential applications. Here, we introduced Sb ions into the lead-free perovskites derivative (NH)SnCl via a doping strategy. For the first time we synthesis the excitation-dependent perovskite with dynamically tunable fluorescence from yellow to near-infrared (NIR) emission by varying the UV excitation from 360 to 390 nm at room temperature. The DFT calculations are highly consistent no matter whether the coordination number of Sb is 5 or 6. In contrasting to the early report of Sb triplet emission in the Sb doped perovskite, this material give a mixed self-trapped exciton (STE) emission. The 590 nm emission band is derived from the STE of SbCl, and the 734 nm NIR emission band is attributed to the Sb-Sn mixed STE, which is supported by DFT calculations and spectral results. This study provides guidance for the design of perovskite phosphors with high efficiency and excitation-dependent properties.
具有高光致发光效率和简单的溶液合成方法，卤化铅钙钛矿有望成为显示和照明的有前途的材料。然而，铅的毒性和环境敏感性阻碍了其潜在应用。在这里，我们通过掺杂策略将 Sb 离子引入到无铅钙钛矿衍生物（NH）SnCl 中。我们首次通过在室温下将 UV 激发从 360nm 变化到 390nm，合成了具有动态可调荧光的激发依赖性钙钛矿，其荧光从黄色到近红外（NIR）发射。DFT 计算无论 Sb 的配位数是 5 还是 6，结果都高度一致。与 Sb 掺杂钙钛矿中 Sb 三重态发射的早期报道相反，这种材料给出了混合自陷激子（STE）发射。590nm 发射带来源于 SbCl 的 STE，734nm NIR 发射带归因于 Sb-Sn 混合 STE，这得到了 DFT 计算和光谱结果的支持。本研究为设计具有高效率和激发依赖性的钙钛矿荧光粉提供了指导。
