Femtosecond Laser Atomic–Nano–Micro Fabrication of Biomimetic Perovskite Quantum Dots Films toward Durable Multicolor Display
Jianqiang Xiao, Kai Yin, Lingxiao Wang, Jiaqing Pei, Xinghao Song, Yin Huang, Jun He, Ji’an Duan
Abstract
Perovskite quantum dots (QDs) have emerged as revolutionary materials for next-generation display technologies due to their tunable bandgaps, high color purity, and low-cost fabrication. However, challenges persist in outdoor display applications, including poor stability, inadequate weatherability designs, and multicolor integration difficulties. This study proposes a bioinspired “atomic–nano–micro” fabrication strategy based on femtosecond laser direct writing (FsLDW). By synergizing transient laser thermodynamic modulation with surface micro/nanostructural engineering, dual-functional architectures are simultaneously constructed on a polyvinylidene fluoride (PVDF) substrate. The upper layer utilizes laser ablation to generate hierarchical micro/nano structures, forming a lotus-leaf-inspired superhydrophobic surface (contact angle >161°, sliding angle <3°) that provides self-cleaning capability and water-erosion resistance. The lower layer leverages the low thermal conductivity of PVDF to regulate the localized thermal environment, driving directional crystallization of CsPbX 3 (X = Cl/Br/I) QDs with in situ halogen composition control, thereby achieving single-step FsLDW-patterned full-spectrum emission (475–690 nm) and high-resolution patterning (∼20 μm). The resulting films retain over 90% of their initial luminescence intensity after simulated outdoor environmental testing and demonstrate exceptional rain-driven self-cleaning properties, effectively resisting pollutant coverage. This strategy offers an innovative solution for developing perovskite-based luminescent devices that integrate high stability, flexibility, full-color display, and weather resistance.