Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 7, Pages 1838-1846Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c00088
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Funding
- NSF of China [21773151]
- Innovation Team Project of Educational Commi ssion of Guangdong Province of China [2019KCXTD007]
- Department of Education of Guangdong Province [2019KZDXM047, 2018KTSCX281]
- 2020 Li Ka Shing Foundation Cross-Disciplinary Research Grant [2020LKSFG05A]
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This study demonstrates a new strategy to tune the optical properties of Mn-doped CsPbCl3 nanocrystals by adjusting the concentration of ligands, showing successful control of dual-color emission while revealing the involvement of mediated traps in the host-to-dopant internal energy-transfer process.
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.
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