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.
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。
