Fig. 1
Conversion of a Pb-MOF to luminescent MAPbBr3 NCs@Pb-MOF. a Schematic of the conversion process. MAX represents the halide salt (CH3NH3X, X = Cl, Br, or I). The green spheres in the matrix represent the MAPbBr3 NCs. The two black boxes show 3D crystal structure of the Pb-MOF (left) and MAPbBr3 (right). The Pb coordination polyhedra of the Pb-MOF (the Pb atom are coordinated by nine O atoms, in which two O atoms of one carboxylate coordinate to a Pb and also bridge two adjacent Pb atoms) and MAPbBr3 are represented in orange and green, respectively. Other atom color scheme: C = gray, O = red, N = blue, Br = yellow. H-atoms have been omitted for clarity. b, c Optical images of MAPbBr3 NCs@Pb-MOF powder under b ambient light and c 365 nm UV lamp; d–f Characterization of the MAPbBr3 NCs@Pb-MOF: d TEM image, e HR-TEM image of one individual NC with the corresponding fast Fourier transformation image in the bottom right corner and f XRD patterns. Scale bar, 20 nm (d); 5 nm (e)
