Full-Color Chemically Modulated g-C₃N₄ for White-Light-Emitting Device

Polymeric g-C₃N₄ with controllable photoluminescence emission wavelength in the whole visible light range (450–650 nm) is synthesized through the one-step molecular doping during the thermal condensation process of g-C₃N₄ conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero-molecules, the modified g-C₃N₄ with the optical properties controlled according to the demand of practical applications can be facilely and largely obtained. It overcomes the limitation of the narrow adjusting range of conventional g-C₃N₄ on optical properties and makes it become more promising for applications in solid-state displays. The corresponding multiple-color g-C₃N₄-based LED devices and the white-light LEDs with high quality can be obtained as supported by experiments and theoretical calculations. Moreover, the effect of doped molecule on the π-conjugated system of g-C₃N₄ is systematically studied here, and the tunable luminescence mechanism is proposed.