Arturo Susarrey‐Arce

3D ceramic architectures are captivating geometrical features with an immense demand in optics. In this work, an additive manufacturing (AM) approach for printing alkaline‐earth perovskite 3D microarchitectures is developed. The approach enables custom‐made photoresists suited for two‐photon lithography, permitting the production of alkaline‐earth perovskite (BaZrO 3 , CaZrO 3 , and SrZrO 3 ) 3D structures shaped in the form of octet‐truss lattices, gyroids, or inspired architectures like sodalite zeolite, and C 60 buckyballs with micrometric and nanometric feature sizes. Alkaline‐earth perovskite morphological, structural, and chemical characteristics are studied. The optical properties of such perovskite architectures are investigated using cathodoluminescence and wide‐field photoluminescence emission to estimate the lifetime rate and defects in BaZrO 3 , CaZrO 3 , and SrZrO 3 . From a broad perspective, this AM methodology facilitates the production of 3D‐structured mixed oxides. These findings are the first steps toward dimensionally refined high‐refractive‐index ceramics for micro‐optics and other terrains like (photo/electro)catalysis.