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Precise Ligand Tuning Emission of Mn-Doped CsPbCl3 Nanocrystals by the Amount of Sulfonates
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-02-12 , DOI: 10.1021/acs.jpclett.1c00088
Dengfeng Luo 1 , Sirui Yang 1 , Qing Zhang 1 , Limei Cha 2, 3 , Li Dang 1 , Ming-De Li 1
Affiliation  

Using Mn-doped CsPbCl3 nanocrystals (Mn:CsPbCl3 NCs) to improve perovskite’s properties is becoming an important strategy. Here, we demonstrate a modified supersaturated recrystallization route to synthesize high-quality Mn:CsPbCl3 NCs at room temperature. Unprecedentedly, sulfonate ligands with various concentrations are shown to successfully tune the dual-color emission of Mn:CsPbCl3 NCs. Ultrafast transient absorption studies reveal that the host-to-dopant internal energy-transfer process involves the mediated traps. Interestingly, the dual-color emission is tuned via stabilizing mediated traps with a small amount of ligand (band edge (BE) emission reduces and Mn2+ emission increases), passivating the deep traps with a large amount of ligand (Mn2+ emission increases), and destroying Mn:CsPbCl3 NCs with too much ligand (both BE and Mn2+ emission is quenched). Furthermore, the ligand tuning Mn2+ emission exhibits quenching for Cu2+ with high sensitivity and selectivity. Our work provides a new strategy to tune the optical properties of Mn:CsPbCl3 NCs and presents its potential application in an optical detector.

中文翻译:

Mn掺杂CsPbCl 3纳米晶体的精确配体调谐发射量(以磺酸盐计)

使用锰掺杂的CsPbCl 3纳米晶体(Mn:CsPbCl 3 NCs)来改善钙钛矿的性能正成为重要的策略。在这里,我们展示了一种改进的过饱和重结晶途径,可以在室温下合成高质量的Mn:CsPbCl 3 NC。前所未有地,各种浓度的磺酸盐配体成功地调节了Mn:CsPbCl 3 NC的双色发射。超快速瞬态吸收研究表明,从宿主到掺杂剂的内部能量转移过程涉及介导的陷阱。有趣的是,通过稳定的,带有少量配体的介导陷阱对双色发射进行了调整(带边缘(BE)发射减少并且Mn 2+发射增加),钝化具有大量配体的深陷阱(Mn 2+发射增加),并破坏具有过多配体的Mn:CsPbCl 3 NCs(BE和Mn 2+发射均被淬灭)。此外,配体调节Mn 2+的发射表现出对Cu 2+的猝灭,具有高灵敏度和选择性。我们的工作提供了一种新的策略来调整Mn:CsPbCl 3 NC的光学性质,并提出了其在光学探测器中的潜在应用。
更新日期:2021-02-25
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