We report the production of ultrafine rare earth metal oxide nanoparticles from metal–organic frameworks (MOFs) using lasers, exemplified by conversion three Tb-MOFs composed different linkers, such as C4H4O4 (H2Fum), C27H18O6 (H3BTB), and C24H15O6N3 (H3TATB). The size resulting terbium is precisely controlled 3 to 12 nm with a narrow distribution, which was challenging be obtained other method...