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

Abstract Polymeric g‐C 3 N 4 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‐C 3 N 4 conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero‐molecules, the modified g‐C 3 N 4 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‐C 3 N 4 on optical properties and makes it become more promising for applications in solid‐state displays. The corresponding multiple‐color g‐C 3 N 4 ‐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‐C 3 N 4 is systematically studied here, and the tunable luminescence mechanism is proposed.