Boosting the stability of lead halide perovskite nanocrystals by metal–organic frameworks and their applications

Abstract

Lead halide perovskites (LHPs) have demonstrated their expertise in the field of optoelectronics. However, the commercialization of these materials is not easy because they have poor stability in humidity, light,...

Halide-dependent humidity sensing of Cs2SnX6 (X = Cl, Br, I) perovskites for real-time human physiological moisture detection

“…Physiological moisture monitoring is an important basis for evaluating human health. 39,40 To date, several sensing materials have been applied to monitor human respiration. 18,41 Due to the favorable humidity sensing properties of Cs 2 SnCl 6 , we use two testing methods: water evaporation from fingers and human As shown in Fig.…”

Highly Luminescent and Water-Stable CsPbCl3/Mn2+/PEG Nanocrystals for Ultrasensitive Detection of 4-Nitrophenol

“…In recent years, CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have shown great potential in various optoelectronic devices and fluorescence probes due to their high photoluminescence quantum yields (PLQYs), narrow bandwidth, low reaction temperature, low cost, and tunable emission wavelengths across the entire visible spectrum. − However, the low formation energy and ionic nature of perovskite materials, as well as their sensitivity to humidity, light, and temperature, , limit their stability and hinder their application in many commercial areas, especially in bioanalytical detection. Finally, lead is a heavy metal element harmful to human health, and most lead-free double perovskite materials suffer from issues such as poor QY and stability compared with Pb-based perovskite, which severely limits their practical application.…”

Improving the stability of perovskite nanocrystals via SiO2 coating and their applications

“…Specically, when LHP NCs are exposed to external environment, factors such as oxygen, polar solvent, light, and heat cause phase transformation and even structure degradation, resulting in serious photoluminescence (PL) quenching. [6][7][8][9][10] This problem is mainly attributed to two aspects: (1) the intrinsic ionic structure and low lattice energy of LHP NCs; (2) dynamic equilibrium between the adsorption and desorption of ligands on their surface. 11 Moreover, the halide anion exchange reaction between LHP NCs with different emitted colors upon mixing is another issue that hinders their practical application in multicolor display and lighting.…”