Fig. 1. Schematic overview of the current research on the photo-processing of perovskites.

Fig. 2. (a) Optical absorption spectra (dash curves) and PL spectra (solid curves) of CsPbX₃ perovskite NCs with various halide compositions. SEM images of perovskite films produced by (b) thermal annealing, (c) nanosecond laser writing, and (d) nanosecond laser writing with addition of carbon quantum dots. Scale bar, 500 nm. (e) Optical images and PL mapping of a CsPbBr₃ perovskite array during the erasing–recovery processes excited by UV light. Scale bars: 100 μm. Figure reproduced with permission from: (a) ref.⁴³, Elsevier; (b–d) ref.⁶⁹, John Wiley and Sons; ref.⁷⁵, Springer Nature.

Fig. 3. (a) Mechanism of UV light induced patterning of perovskite NCs. (b) Patterning of various perovskite NCs. SEM images of the CsPbBr₃ microlenses (c) and surface gratings (d). Figure reproduced with permission from: (a, b) ref.⁴², under a Creative Commons AttributionLicense 4.0; (c, d) ref.⁵³, John Wiley and Sons.

Fig. 4. (a) Schematic of ultrafast laser–induced liquid nanophase separation and generation of CsPb(Br_1−xI_x)₃ perovskite NCs. (b) PL mappings and spectra of CsPb(Br_1−xI_x)₃ perovskite NCs. Scale bar: 10 μm. (c) PL mappings and spectra of perovskite NCs in the Cl⁻-Br⁻-I⁻ codoped glass. Figure reproduced with permission from ref.³³, American Association for the Advancement of Science.

Fig. 5. (a) Schematic diagram of laser induced phase transition from CsPb₂Br₅ to CsPbBr₃ inside a CsPb₂Br₅ microplatelet. (b) PL spectra of CsPbBr₃ generated by laser irradiation with various times (65 s per time). (c) The integral PL intensity as a function of the excitation intensity. (d) Schematic diagram of the strong cavity mode spontaneous emission of the laser-written CsPbBr₃ in the CsPb₂Br₅ microplatelet. Figure reproduced with permission from ref.⁹⁷, American Chemical Society.

Fig. 6. (a–d) Light induced shape evolution of CsPbBr₃ nanostructures with an increase in irradiation. (e) Schematic of light-induced ligand removal mechanism and assembly of CsPbBr₃ nanocubes. (f) High-angle annular dark-field scanning transmission electron microscopy image of assembled nanostructures. (g) Cubic and (h) spindle perovskite superlattices. Figure reproduced with permission from: ref.¹⁰², American Chemical Society; ref.¹⁰⁵, John Wiley and Sons.

Fig. 7. (a) SEM images of a CsPbBr₃ nanowire with laser-patterned nanogratings. (b) A schematically nanowire laser with vertically emitting light from its upper face. (c) PL image of the nanowire laser. (d) Photodetector arrays based on laser-written perovskites. Figure reproduced with permission from: (a−c) ref.⁵¹, American Chemical Society; ref.⁷⁰, John Wiley and Sons.

Fig. 8. (a) Schematic illustration of micro-LED devices with laser-written perovskite NCs inside a glass. (b) A dynamic holographic display. (c) PL mapping of the 3D perovskite dots in glass. (d) PL mapping of a perovskite pattern with tunable emission wavelength. Figure reproduced with permission from ref.³³, American Association for the Advancement of Science.