Laser‐Induced In Situ Synthesis of Perovskite Quantum Dots: Mechanisms and Patterned Applications

Abstract In recent years, lead halide perovskite quantum dots (PQDs) have exhibited immense potential in fabricating patterned light‐emitting layers for display devices. The laser‐induced in situ synthesis of PQDs is an attractive patterning method due to the advantages of high efficiency, high precision, and non‐contact processing. By leveraging laser‐induced photothermal, photochemical, or other effects, it triggers the crystallization of PQDs at specified locations on precursor films, thereby achieving simultaneous synthesis and patterning. This review systematically summarizes precursor system design, polymer matrix selection, and film preparation methods on in situ synthesis. And it focuses on the synthesis mechanisms under continuous‐wave and pulsed laser irradiation, encompassing photothermal and other laser‐induced reactions. Additionally, it demonstrates the technology's applications in high‐resolution, flexible, and multi‐color LED patterning. Finally, future development directions such as lead‐free systems and solvent‐free processes are discussed, while current challenges in environmental stability and process reproducibility are highlighted, providing insights for the scalable application of this technology.