From Trifluoroacetate Complex Precursors to Monodisperse Rare‐Earth Fluoride and Oxyfluoride Nanocrystals with Diverse Shapes through Controlled Fluorination in Solution Phase

摘要: We report the first systematic synthesis of monodisperse rare-earth (RE=La to Lu, Y) fluoride and oxyfluoride nanocrystals with diverse shapes (trigonal REF3 triangular, truncated-triangular, hexagonal, polygonal nanoplates; orthorhombic quadrilateral zigzag-shaped cubic REOF nanopolyhedra nanorods) from single-source precursors (SSP) [RE(CF(3)COO)(3)] through controlled fluorination in oleic acid (OA)/oleylamine (OM)/1-octadecene (ODE). To selectively obtain or nanocrystals, RE-O bond RE-F at nucleation stage was by finely tuning ratio OA/ODE OA/OM, reaction temperature. For phase-pure naocrystals, their shape-selective syntheses could be realized further modifying conditions. The two-dimensional growth nanoplates one-dimensional nanorods were likely due selective adsorption capping ligands on specific crystal planes nanocrystals. Those well-shaped geometric symmetries (such as D(3h), D(6h), C(2h), O(h), D(nh)) displayed a remarkable capability form self-assembled superlattices. By manipulating solvent-substrate combination, plate-shaped highly ordered nanoarrays means either face-to-face formation edge-to-edge formation. using this SSP strategy, we also obtained high-quality LaF3:Eu LaF3:Eu/LaF3 triangular that showed photoluminescent red emissions Eu3+ ions sensitive surface effect.