Fast Room-Temperature Cation Exchange Synthesis of Mn-Doped CsPbCl Nanocrystals Driven by Dynamic Halogen Exchange.

Currently, it is of great challenge to achieve cation exchange in CsPbX (X = Cl, Br, I) perovskite nanocrystals (NCs) on account of rigid Pb octahedral coordination protected by six halogen anions (PbX). Herein, we demonstrate that dynamic halogen exchange can effectively open up PbX octahedrons and enable fast Mn-to-Pb cation exchange at room temperature in a few seconds. Importantly, Cl concentration rather than Mn one is demonstrated to be a dominant factor for cation exchange, where different Mn/Cl salts can be adopted as Mn/Cl sources and Cl-to-Cl or Cl-to-Br anion exchange is the necessary prerequisite.

Tunable CsPbBr/CsPbBr phase transformation and their optical spectroscopic properties.

As a novel type of promising materials, metal halide perovskites are a rising star in the field of optoelectronics. On this basis, a new frontier of zero-dimensional perovskite-related Cs4PbBr6 with bright green emission and high stability has attracted an enormous amount of attention, even though its photoluminescence still requires to clarification. Herein, the controllable phase transformation between three-dimensional CsPbBr3 and zero-dimensional Cs4PbBr6 is easily achieved in a facile ligand-assisted supersaturated recrystallization synthesis procedure via tuning the amount of surfactants, and their unique optical properties are investigated and compared in detail.

High light harvesting efficiency CuInS quantum dots/TiO/MoS photocatalysts for enhanced visible light photocatalytic H production.

Expanding the photoresponse range of TiO2-based photocatalysts is of great interest for photocatalytic H2 production. Herein, noble-metal-free CuInS2 quantum dots were employed as a novel inorganic dye to expand the visible light absorption of TiO2/MoS2 for solar H2 generation. The as-prepared CuInS2/TiO2/MoS2 photocatalysts exhibit broad absorption from the ultraviolet to near-infrared region.

Silica-Coated Mn-Doped CsPb(Cl/Br) Inorganic Perovskite Quantum Dots: Exciton-to-Mn Energy Transfer and Blue-Excitable Solid-State Lighting.

Tunability of emitting colors of perovskite quantum dots (PQDs) was generally realized via composition/size modulation. Due to their bandgap absorption and ionic crystal features, the mixing of multiple PQDs inevitably suffers from reabsorption and anion-exchange effects. Herein, we address these issues with high-content Mn-doped CsPbCl PQDs that can yield blue-excitable orange Mn emission benefited from exciton-to-Mn energy transfer and Cl-to-Br anion exchange.

Full-Spectral Fine-Tuning Visible Emissions from Cation Hybrid CsFAPbX (X = Cl, Br, and I, 0 ≤ m ≤ 1) Quantum Dots.

Full-color visible emissions are particularly crucial for applications in displays and lightings. In this work, we developed a facile room-temperature ligand-assisted supersaturated recrystallization synthesis of monodisperse, cubic structure CsFAPbX (X = Cl, Br, and I or their mixtures Cl/Br and Br/I, 0 ≤ m ≤ 1) hybrid perovskite quantum dots (QDs). Impressively, cation substitution of Cs by FA was beneficial in finely tuning the band gap and in exciton recombination kinetics, improving the structural stability, and raising the absolute quantum yields up to 85%.

Noble-metal-free MoS nanosheet modified-InVO heterostructures for enhanced visible-light-driven photocatalytic H production.

Noble-metal-free, visible-light-responsive and "green" MoS nanosheet modified-InVO heterostructures were synthesized as efficient photocatalysts for photocatalytic H production. The positive effect of intimate nanojunctions formed between MoS and InVO resulted in the excellent activity of MoS/InVO which is even higher than that of Pt-loaded InVO.