Near-white emission in covalent organic frameworks (COFs) is of significant interest for applications in displays, lighting, and sensing technologies. Although several strategies have been explored to achieve white-light emission in COFs, these approaches often suffer from limited compositional control, poor guest retention, and unsatisfactory emission reproducibility. In this work, we employ a dual-emissive molecular unit, an excited-state intramolecular proton transfer (ESIPT)-active dialdehyde [4,4′-(2-(2-hydroxyphenyl)benzo[d]thiazole-4,7-diyl)dibenzaldehyde, HBT], to construct two three-dimensional (3D) imine-linked COFs, designated JUC-755 and JUC-756. Within the COF frameworks, both the enol and keto emissions of the HBT unit are retained and can be effectively modulated by solvent polarity and hydrogen-bonding interactions. Consequently, in N-methyl-2-pyrrolidone, JUC-755 exhibits yellowish-white emission with CIE coordinates of (0.30, 0.37), while JUC-756 displays bluish-white emission with CIE coordinates of (0.27, 0.32). This work provides a promising strategy for tuning dual emission and realizing near-white-light emission in 3D COFs.
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