Stable perovskite nanocrystals in glass by LDW technology. (a) Schematic illustration of direct lithography of colored PNCs and patterns, (b) PL spectra of CsPb(Br_1−xI_x)₃ PNCs written in one piece of glass, (c) Optical images (top) and PL mappings (bottom), (d) Schematic of ultrafast laser–induced liquid nanophase separation and formation of CsPb(Br_1−xI_x)₃ NCs. (reprinted with permission from Ref. [79]).