MOF-Confined Sub-2 nm Stable CsPbX3 Perovskite Quantum Dots.

Zhenxing Li,Chengcheng Yu,Mingliang Hu,Junmei Chu,Zhiting Wei,Xin Zhang,Yangyang Wen,Miao He,Xiaofei Xing

doi:10.3390/nano9081147

Abstract

The metal halide with a perovskite structure has attracted significant attention due to its defect-tolerant photophysics and optoelectronic features. In particular, the all-inorganic metal halide perovskite quantum dots have potential for development in future applications. Sub-2 nm CsPbX3 (X = Cl, Br, and I) perovskite quantum dots were successfully fabricated by a MOF-confined strategy with a facile and simple route. The highly uniform microporous structure of MOF effectively restricted the CsPbX3 quantum dots aggregation in a synthetic process and endowed the obtained sub-2 nm CsPbX3 quantum dots with well-dispersed and excellent stability in ambient air without a capping agent. The photoluminescence emission spectra and lifetimes were not decayed after 60 days. The CsPbX3 quantum dots maintained size distribution stability in the air without any treatment. Because of the quantum confinement effect of CsPbX3 quantum dots, the absorption and photoluminescence (PL) emission peak were blue shifted to shorter wavelengths compare with bulk materials. Furthermore, this synthetic strategy provides a novel method in fabricating ultra-small photoluminescence quantum dots.

Highlights

Metal halides with a perovskite crystal structure have gained significant interest in multidisciplinary research areas owing to their outstanding photovoltaic and optoelectronic properties [1,2,3,4,5]
Lead-based trihalides have enabled a whole new class of highly-efficient, low-cost, and solution processable light-harvesting and light-emitting devices [6,7,8]. Such compounds exbibit a broad tunable photoluminescence ranging from the ultraviolet (UV) to the near-infrared (NIR) region in the electromagnetic spectrum, high photoluminescence quantum yield (PLQY), and a narrow full width at half-maximum (FWHM), whose properties inspire more and more researchers to exploit these materials to be applied in high-efficiency solar cells, light-emitting diodes (LED), low threshold lasers, high-sensitivity photodetectors, and so on [9,10]
It is noteworthy that the size distribution of these CsPbX3 quantum dots confined in Cu-BDC is well remained in ambient air without any post-treatment

Summary

Introduction

Metal halides with a perovskite crystal structure have gained significant interest in multidisciplinary research areas owing to their outstanding photovoltaic and optoelectronic properties [1,2,3,4,5]. Lead-based trihalides have enabled a whole new class of highly-efficient, low-cost, and solution processable light-harvesting and light-emitting devices [6,7,8] Such compounds exbibit a broad tunable photoluminescence ranging from the ultraviolet (UV) to the near-infrared (NIR) region in the electromagnetic spectrum, high photoluminescence quantum yield (PLQY), and a narrow full width at half-maximum (FWHM), whose properties inspire more and more researchers to exploit these materials to be applied in high-efficiency solar cells, light-emitting diodes (LED), low threshold lasers, high-sensitivity photodetectors, and so on [9,10]. In the context of optoelectronic applications and photoluminescence emission, the well-dispersed perovskite quantum dots show high quantum yields, and tunable light emission wavelength The demonstration of these novel perovskite quantum dots opens a new way to designing optoelectronic devices, such as solar cells, displays, lasers and photodetectors. It is noteworthy that the size distribution of these CsPbX3 quantum dots confined in Cu-BDC is well remained in ambient air without any post-treatment

Materials and Methods

Findings

Conclusions