Precise Ligand Tuning Emission of Mn-Doped CsPbCl3Nanocrystals by the Amount of Sulfonates

Dengfeng Luo, Sirui Yang, Qing Zhang, Limei Cha, Li Dang*, Ming De Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)1838-1846
Number of pages9
JournalJournal of Physical Chemistry Letters
DOIs
StateAccepted/In press - 2021

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