Innovative Solid‐State Memory Ruddlesden‐Popper Perovskite Imprinting Technology for Anti‐Counterfeiting and Laser Applications

Abstract Micro/nanoimprinting technology has emerged as a crucial technique in the fabrication of perovskite optoelectronic devices. Traditional imprint methods rely heavily on solution‐based confinement techniques, requiring precise control over temperature, pressure, and demolding processes for achieving high‐resolution patterning. This study introduces a novel solid‐state perovskite thin‐film imprinting mechanism that integrates pressure memory with a demolding‐free fabrication process. This specialized transparent perovskite‐polymer system is highly sensitive to external stress and strain. The pressure‐induced internal structural alterations promote preferential perovskite crystal nucleation and growth during subsequent thermal annealing, thereby effectively recording pressure‐related information. Furthermore, compositional engineering of the perovskite‐polymer system enables tunable luminescence across the visible spectrum. By integrating this imprinting strategy with a deep learning model, information encryption, decryption, and anti‐counterfeiting validation are successfully demonstrated using multi‐colored latent fingerprint imaging. The remarkable emission properties of imprinted perovskite also position them as high‐efficiency laser gain media. This potential is realized by constructing a low‐threshold, two‐photon‐pumped Fabry‐Pérot laser, incorporating imprinted perovskite between a distributed Bragg reflector and silver film. These results confirm the excellent performance of the perovskite imprinting films, highlighting their potential applications in information encryption, fingerprint anti‐counterfeiting, and advanced laser technologies.