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A CsPbBr3/Cs4PbBr6 perovskite composite, which exhibits highly efficient pure green luminescence and better long-term stability than CsPbBr3 nanocrystals, has emerged for wide color gamut displays and various optoelectronic applications. While many reports have been made on the optoelectronic properties of perovskite materials, the study of the rapid mass synthesis of this material remains challenging. In addition, more case studies are still needed to optimize the conditions such as the differences in raw materials or addition of ligands, and to clarify these changes. Here, a new synthesis strategy is reported that enables rapid mass synthesis of green-emitting perovskite composites by forming ultrafine reverse microemulsions by hydraulic shear. Furthermore, in this synthesis method, the oleylamine (OLA)/oleic acid (OA) ratio plays an important role in the improvement of photoluminescence quantum yields (PLQYs), which is ascribed to the increase of luminescent CsPbBr3 in the Cs4PbBr6 matrix. This high color purity green-emitting perovskite composite exhibits excellent optical properties of a high PLQY of 50.6%, an emission wavelength of 519 nm, and a narrow full-width at half-maximum of 22.4 nm. [ABSTRACT FROM AUTHOR]

We have, for the first time, reported a highly efficient MP–(Cs0.4Rb0.6)PbBr3 luminescent material for application in optoelectronic devices. MP–(Cs0.4Rb0.6)PbBr3 with red-emitting Sr2Si5N8:Eu2+ phosphor is applied to an InGaN blue chip and compared with green-emitting (Cs0.4Rb0.6)PbBr3 perovskite nanocrystals (NCs). MP–(Cs0.4Rb0.6)PbBr3 achieves a conversion efficiency of 80.9 lm W−1 under a forward-bias current of 150 mA. We propose MP–(Cs0.4Rb0.6)PbBr3 as a promising green-emitting material that can replace the conventional inorganic phosphor. [ABSTRACT FROM AUTHOR]