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

1D all-inorganic perovskite CsPbX₃ (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 CsPbI₃ nanowires (NWs), remains challenging. In this paper, an efficient and controllable solvothermal route is developed to synthesize strongly quantum-confined CsPbX₃ 1D nanostructures with uniform size and excellent crystallinity, including CsPbCl₃ and CsPbBr₃ nanorods (NRs) as well as CsPbI₃ NWs through precise regulation of reaction temperature, duration, and precursor ratios. The as-synthesized CsPbI₃ 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 CsPbCl₃ and CsPbBr₃ 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.