Template-free Ordered Perovskite Nanowire Films for Linearly Polarized Luminescence

Abstract With intrinsic linearly polarized luminescence properties perovskite nanowires have attracted wide spread attention.However in the absence of template-assisted alignment during film formation perovskite nanow ires are difficult to achieve uniform orientation thereby limiting their potential applications in linearly polarized lumi nescence.In this work we address the challenge of template-free oriented film formation of perovskite nanowires by combining the regulation of their aggregation structures in suspension with the scalable blade coating process.By op timizing the suspension concentration and the shear force during blade coating we have achieved perovskite nanow ire films with a photoluminescence polarization degree of 66. 7% and an electroluminescence polarization degree of 27. 5%.This study presents a novel approach for the large-scale and cost-effective fabrication of high-performance linearly polarized luminescent devices.Key words metal halide perovskites semiconducting nanowires blade