通过异金属掺杂增强 CsMnBr 纳米晶体的发光。
Luminescence Enhancement of CsMnBr Nanocrystals through Heterometallic Doping.
机构信息
College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, National Laboratory of Micro-structures, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
出版信息
J Phys Chem Lett. 2023 Feb 23;14(7):2006-2011. doi: 10.1021/acs.jpclett.2c03921. Epub 2023 Feb 16.
The absorption and photoluminescence (PL) of CsMnBr with Mn(II) in octahedral crystal fields are extremely weak due to a d-d forbidden transition. Herein, we introduce a facile and general synthetic procedure that can prepare undoped and heterometallic doped CsMnBr NCs at room temperature. Importantly, both PL and absorption of CsMnBr NCs were significantly improved after doping a small amount of Pb (4.9%). The absolute photoluminescence quantum yield (PL QY) of Pb-doped CsMnBr NCs is up to 41.5%, 11-fold higher than undoped CsMnBr NCs (3.7%). The PL enhancement is attributed to the synergistic effects between [MnBr] units and [PbBr] units. Furthermore, we verified the similar synergistic effects between [MnBr] units and [SbBr] units in Sb-doped CsMnBr NCs. Our results highlight the potential of tailoring luminescence properties of manganese halides through heterometallic doping.
由于 d-d 禁阻跃迁，具有八面体晶体场的 Mn(II) 的 CsMnBr 的吸收和光致发光（PL）极其微弱。在此，我们介绍了一种简便通用的室温合成方法，可制备未掺杂和杂金属掺杂的 CsMnBr NCs。重要的是，掺杂少量 Pb（4.9%）后，CsMnBr NCs 的 PL 和吸收均得到显著提高。Pb 掺杂 CsMnBr NCs 的绝对光致发光量子产率（PL QY）高达 41.5%，比未掺杂的 CsMnBr NCs（3.7%）高 11 倍。PL 增强归因于[MnBr]单元和[PbBr]单元之间的协同效应。此外，我们在 Sb 掺杂的 CsMnBr NCs 中验证了[MnBr]单元和[SbBr]单元之间的类似协同效应。我们的结果突出了通过杂金属掺杂来调整卤化锰发光性能的潜力。
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