Tuning Solid-State Emission of 9-Anthraldehyde through Cocrystal Engineering

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 crystals, difference in AA-DITFB originates from π–π interaction between chromophores. As AA-TCNB, its prominent red-shifted result charge-transfer interaction, confirmed by infrared spectroscopy, “hole-electron” analysis spectroscopy. This work not only reveals relationship molecular structure fluorescent properties, but also proposes to develop multicolor systems tunable efficiency lifetime.