Thiophene Derivatives as Ligands for Highly Luminescent and Stable Manganese-Doped CsPbCl3 Nanocrystals.

Qian Wang,Long Gao,Jiaqi Zhang,Chenxi Yu,Meng Wang,Lijie Gou

doi:10.3389/fchem.2022.849801

Abstract

Ligands on the surface of perovskite nanocrystals are important to stabilize the nanocrystal structure. However, the research of ligands on Mn2+ ion-doped CsPbCl3 nanocrystals (Mn: CsPbCl3 NCs), a promising candidate family for the lightning community, is relatively rare. Here, we demonstrate a new ligand modification strategy for preparing high-quality Mn: CsPbCl3 NCs by a simple hot-injection method. Thiophene derivative, for the first time, is applied as ligands for perovskite nanocrystals. The new ligands of thiophene derivatives passivate defects on the surface of NCs and enhance optical properties, originating from the sulfur in thiophene additives binding to the uncoordinated lead ions. The photoluminescence quantum yield of the modified Mn: CsPbCl3 NCs is 93% in comparison with 46% of the pristine counterparts, whose value is the highest to date for ligand-modified Mn: CsPbCl3 NCs. Meanwhile, the thermal, storage, and purification stability are also significantly improved. The performance of related LEDs is also investigated.

Highlights

In recent years, all-inorganic lead halide perovskite nanocrystals (NCs) CsPbX3 (X = Cl, Br, I) have attracted great attention due to their high photoluminescence efficiency, tunable bandgap, high color purity, strong light absorption, and high carrier mobility (Yang et al, 2019a, 2020; Cao et al, 2020; Sun et al, 2020)
High-quality Mn2+ ion-doped CsPbCl3 nanocrystals (Mn)-doped CsPbCl3 NCs with 3-thienylboronic acid (TBA) were synthesized by the hot-injection method (Yang et al, 2020)
thiophene derivatives 3thienylboronic acid (TBA) was applied as the additional thiophene derivative ligand during the nanocrystal formation process

Summary

Introduction

All-inorganic lead halide perovskite nanocrystals (NCs) CsPbX3 (X = Cl, Br, I) have attracted great attention due to their high photoluminescence efficiency, tunable bandgap, high color purity, strong light absorption, and high carrier mobility (Yang et al, 2019a, 2020; Cao et al, 2020; Sun et al, 2020). Compared with the organic–inorganic hybrid methylamine lead halide perovskite, they have higher light, thermal, and humidity stability, which all have spurred their applications in solar cells, photodetectors, light-emitting diodes, etc (Liu Y. et al, 2018; Lu et al, 2018). The doping of Mn2+ provides efficient dual-emission from Mn2+ ions (around 600 nm) and the host (around 400 nm), and NCs show an orange–red light which originates from the energy transfer from host perovskite to Mn2+ and contributes to the d–d transition

Methods

Results

Conclusion