1D Strongly Quantum‐Confined CsPbX ₃ Nanostructures Toward Highly Efficient and Stable Photoluminescence

Abstract 1D all‐inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanostructures exhibit significant potential in optoelectronics owing to their unique quantum confinement effects and anisotropic properties. Nevertheless, the controllable synthesis of these materials, particularly high‐stability and high‐luminance CsPbI 3 nanowires (NWs), remains challenging. In this paper, an efficient and controllable solvothermal route is developed to synthesize strongly quantum‐confined CsPbX 3 1D nanostructures with uniform size and excellent crystallinity, including CsPbCl 3 and CsPbBr 3 nanorods (NRs) as well as CsPbI 3 NWs through precise regulation of reaction temperature, duration, and precursor ratios. The as‐synthesized CsPbI 3 NWs exhibit precisely tunable photoluminescence (PL) within the range of 605–632 nm, high PL quantum yields (PLQYs) more than 90%, excellent PL performance, and significantly enhanced environmental and photostability. Furthermore, 1D CsPbCl 3 and CsPbBr 3 NRs are also successfully prepared, exhibiting PL peak wavelengths at 381 and 462 nm with PLQYs of 65.5% and 70.4%, respectively. Moreover, multicolor luminescent films are successfully fabricated through incorporating these nanomaterials, demonstrating their promising potential for applications in lighting and displays. This work introduces a general and reliable synthetic strategy for the precise fabrication of high‐quality 1D perovskite nanomaterials with concurrently improved environmental resilience and operational durability.