Femtosecond Laser‐Induced Regulation of Photo‐ and Persistent Luminescence of Perovskite Crystals.

Manipulation of photoluminescence (PL) and persistent luminescence (PersL) provides a powerful tool for anti‐counterfeiting applications. Here, Sb3+‐doped CsCdCl3 perovskite single crystals (SCs) can be selectively irradiated via utilizing ultra‐fast femtosecond (fs) laser, creating tunable PL colors and PersL duration with high precision. The PL color of the synthesized SCs changes from cyan to orange along with the wavelength of the fs laser, for the successful regulation of the optical procedure from a single‐photon to a two‐photon absorption process. Moreover, an orange PersL of CsCdCl3:Sb3+ SC is observed after being charged with a fs laser, and the corresponding duration time can be feasibly controlled with the pump wavelength. In particular, CsCdCl3:Sb3+ is capable of ultrafast carrier capture (1 s) under fs laser compared to ultraviolet lamp pre‐irradiation enabling a high‐resolution micro‐PersL in photon trapping/de‐trapping modes. These findings not only give a new solution for the fabrication high‐resolution micro‐PL and trajectory‐writing micro‐PersL patterns, but also provide a deep insight to understand the photon–matter interactions. [ABSTRACT FROM AUTHOR]