Wu Chang, Li Yan, Xia Zhengyao, Ji Cheng, Tang Yuqian, Zhang Jinlei, Ma Chunlan, Gao Ju
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China.
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Nanomaterials (Basel). 2023 Jan 28;13(3):533. doi: 10.3390/nano13030533.
The doping of impurity ions into perovskite lattices has been scrupulously developed as a promising method to stabilize the crystallographic structure and modulate the optoelectronic properties. However, the photoluminescence (PL) of Fe-doped mixed halide perovskite NCs is still relatively unexplored. In this work, the Fe-doped CsPb(ClBr) nanocrystals (NCs) are prepared by a hot injection method. In addition, their optical absorption, photoluminescence (PL), PL lifetimes, and photostabilities are compared with those of undoped CsPb(BrCl) NCs. We find the Fe doping results in the redshift of the absorption edge and PL. Moreover, the full width at half maximums (FWHMs) are decreased, PL quantum yields (QYs) are improved, and PL lifetimes are extended, suggesting the defect density is reduced by the Fe doping. Moreover, the photostability is significantly improved after the Fe doping. Therefore, this work reveals that Fe doping is a very promising approach to modulate the optical properties of mixed halide perovskite NCs.
将杂质离子掺入钙钛矿晶格已被精心开发为一种有前景的方法，用于稳定晶体结构和调节光电特性。然而，铁掺杂的混合卤化物钙钛矿纳米晶的光致发光（PL）仍相对未被探索。在这项工作中，通过热注入法制备了铁掺杂的CsPb(ClBr)纳米晶（NCs）。此外，将它们的光吸收、光致发光（PL）、PL寿命和光稳定性与未掺杂的CsPb(BrCl) NCs进行了比较。我们发现铁掺杂导致吸收边和PL发生红移。此外，半高宽（FWHMs）减小，PL量子产率（QYs）提高，PL寿命延长，这表明铁掺杂降低了缺陷密度。此外，铁掺杂后光稳定性显著提高。因此，这项工作表明铁掺杂是调节混合卤化物钙钛矿NCs光学性质的一种非常有前景的方法。
