The regulation of solid-state emission based on cocrystal engineering is an emerging strategy for developing next-generation luminescent materials. Here, three cocrystals (AA-DITFB, AA-TFTPA and AA-TCNB) 9-anthraldehyde (9-AA) are reported, which exhibit a broad range green-to-red emission. Tuning the photophysical properties 9-AA via different mechanisms. Compared with single-component crystal...