In situ Derivation Strategy for Constructing Hour‐level Long‐Persistence Luminescence of Carbon Dots by Matrix Synergy and Internal Charge Transfer

ABSTRACT Traditional long‐persistence luminescent (LPL) materials have severe limitation to practical applications due to low luminescence efficiency, rapid afterglow decay, and poor environmental stability. In this work, we report an in situ derivation strategy of carbon dots (CDs) system materials by matrix synergistic co‐pyrolysis with derivational guest molecules to construct hour‐level bright green LPL. It is found that immobilization of the CDs containing C═O groups in the matrix through hydrogen bonding between C═O and the surface of the rigid matrix can promote the emission of LPL. The as‐prepared LPL CDs powder has an ultra‐broad phosphorescence emission covering from 400 to 800 nm, and the afterglow time visible to the naked eye is in the hourly level (>2 h). The corresponding phosphorescence internal quantum efficiency (IQE) is 7.64%, and the external quantum efficiency is (EQE) 4.3%. Surprisingly, the as‐synthesized CDs‐based LPL material can overcome the traditional dilemma of quenching upon exposure to water or oxygen for the first time, enabling subsequent water‐based processing applications. The intrinsic luminescence mechanism of LPL in the CDs system caused by charge transfer between the host and guest is verified. This work provides strong support for the synthesis of high‐performance LPL materials for water‐based processing applications.