Fig. 1: Synthesis and luminescent properties of B1-B11.

a Synthesis and structure of B7 with its photo under natural light. Atom codes: Tb (green), Eu (pink), C (gray), B (yellow) and O (red). Partial hydrogen atoms and solvent molecules are omitted for clarity. b PXRD of B1-B11. c Solid-state fluorescence spectra of B1-B10 excited at 254 nm. The pictures of B1-B10 were obtained under 254 nm UV light. QY is absolute quantum yield. d Solid-state lifetimes of B1-B10 excited at 254 nm. e Energy transfer efficiencies of B2-B9.