Zero-dimensional organic–inorganic hybrid zinc halide with stable broadband blue light emissions

Abstract

Blue light emitters are an important composition of the three primary colors. Considering the instability and toxicity of three-dimensional (3D) lead halide perovskites, it is significant to explore lead-free hybrid metal halides with high luminescence efficiency and green and pollution-free synthesis processes as solid blue light-emitting materials. In this work, a novel family of zero-dimensional (0D) hybrid zinc-based halides AZnX₄ (A = N-EtPipz, DMPZ, DAPr-Pipz, and MPPZ; X = Cl and Br) based on discrete [ZnX₄]²⁻ tetrahedrons were prepared by a simple method. When excited by UV light, all the four compounds exhibited bright blue light emissions, and among them, [DAPr-Pipz]ZnBr₆ had a photoluminescence quantum yield (PLQY) of 27.68%, indicating their potential as high-efficiency blue phosphors for assembling white light-emitting diodes (LEDs).