Dual Light Emission of CsSnI-Based Powders Synthesized via a Mechanochemical Process.

Lead toxicity has hindered the wide applications of lead halide perovskites in optoelectronics and bioimaging. A significant amount of effort has been made to synthesize lead-free halide perovskites as alternatives to lead halide perovskites. In this work, we demonstrate the feasibility of synthesizing CsSnI-based powders mechanochemically with dual light emissions under ambient conditions from CsI and SnI powders.

Ultra-stable blue-emitting lead-free double perovskite CsSnCl nanocrystals enabled by an aqueous synthesis on a microfluidic platform.

Blue emitting Sn-based lead-free halide perovskite nanocrystals (NCs) are considered to be a promising material in lighting and displays. However, industrialised fabrication of blue-emitting NCs still remains a significant challenge due to the use of toxic solvents and optical instability, not mentioning in large-scale synthesis. In this work, a green-route synthesis of blue-emitting lead-free halide perovskite CsSnCl powders is developed, in which deionized water with a small amount of inorganic acid is used as the solvent and the synthesis of the CsSnCl powders is achieved on a microfluidic platform.

MAPbBrnanocrystals from aqueous solution for poly(methyl methacrylate)-MAPbBrnanocrystal films with compression-resistant photoluminescence.

In this work, we develop an environmental-friendly approach to produce organic-inorganic hybrid MAPbBr(MA = CHNH) perovskite nanocrystals (PeNCs) and PMMA-MAPbBrNC films with excellent compression-resistant PL characteristics. Deionized water is used as the solvent to synthesize MAPbBrpowder instead of conventionally-used hazardous organic solvents. The MAPbBrPeNCs derived from the MAPbBrpowder exhibit a high photoluminescence quantum yield (PLQY) of 93.

Local Deformation and Texture of Cold-Rolled AA6061 Aluminum Alloy.

Using cold rolling, we plastically deform AA6061 sheets at room temperature and investigate the variations of the microstructures, textures and local deformation of the cold-rolled AA6061 sheets as functions of thickness reduction (Δt/t₀, t₀ and t are the thicknesses of the AA6061 sheet before and after the cold rolling, respectively). The volume fraction of total deformation texture is relatively independent of the thickness reduction for Δt/t₀ ≤ 30%, and becomes an approximately linearly increasing function of the thickness reduction for Δt/t₀ > 30%. Increasing the thickness reduction causes the increase of the Vickers hardness of the cross-section of the cold-rolled sheets, which exhibits a similar increase trend to the volume fraction of total deformation texture for Δt/t₀ > 30%.