The three-dimensional (3D) patterning of semiconductors is potentially important for exploring new functionalities and applications in optoelectronics^1,2. Here, we show that it is possible to write on demand 3D patterns of perovskite quantum dots (QDs) inside a transparent glass material using a femtosecond laser. By utilizing the inherent ionic nature and low formation energy of perovskite, highly luminescent CsPbBr₃ QDs can be reversibly fabricated in situ and decomposed through femtosecond laser irradiation and thermal annealing. This pattern of writing and erasing can be repeated for many cycles, and the luminescent QDs are well protected by the inorganic glass matrix, resulting in stable perovskite QDs with potential applications such as high-capacity optical data storage, information encryption and 3D artwork.

半导体的三维（3D）图案对于探索光电^1,2中的新功能和应用具有潜在的重要性。在这里，我们表明可以使用飞秒激光在透明玻璃材料内部按需写入钙钛矿量子点（QD）的3D图案。通过利用钙钛矿的固有离子性质和低形成能，高发光的CsPbBr ₃量子点可以原位可逆地制造，并可以通过飞秒激光辐照和热退火分解。这种写入和擦除的模式可以重复很多次，并且无机玻璃基质可以很好地保护发光量子点，从而形成稳定的钙钛矿量子点，具有潜在的应用前景，例如大容量光学数据存储，信息加密和3D图稿。