이종평 교수

Covalent organic frameworks (COFs) offer ordered π structures that are useful for developing light-emitting materials. However, most COFs are weak in luminescence. Here we report the conversion of less emissive COFs into light-emitting materials via a pinpoint surgery on the pore walls. Deprotonation of the N-H bond to form an anionic nitrogen species in the hydrazone linkage can eliminate the nitrogen-related fluorescence quenching pathway. The resulting COF enhances the fluorescence in a linea

Abstract Covalent organic frameworks (COFs) have attracted considerable attention as a facile and versatile design platform for advanced energy storage materials owing to their structural diversity, ordered porous structures, and chemical stability. In this study, a redox‐active COF (TP–OH–COF) that can accommodate 30 Li + ions is synthesized for potential use as an ultralong cyclable high‐capacity lithium‐ion battery electrode material. The TP–OH–COF is synthesized using triformylpholoroglucino

The ordered π skeletons of covalent organic frameworks make them viable light-emitting materials but their limited tunability has precluded further implementation. Here we report the synthesis of hydrazone-linked frameworks which are stable in water, acid, and base, and demonstrate their utility as a platform for light emission. The polygonal backbone is designed to be luminescent and partially π conjugated while the pore wall is docked with single atom or unit to induce resonance, hyperconjugat

Cationic covalent organic frameworks are obtained <italic>via</italic> post-functionalization and compared to the neutral COFs, the I₂ uptake capacities are improved by 1.3 times due to the electrostatic interactions between COFs’ networks and I₂ molecules.

Abstract The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has rapidly increased over the past 10 years. However, along with further efficiency improvements, it is necessary to improve the long‐term stability of perovskite materials, which limits the commercialization of PSCs. Therefore, it is urgent to find ways to simultaneously suppress charge recombination and degradation of perovskite materials. Here, two covalent organic frameworks (COFs) are synthesized by reacting th

Covalent organic frameworks (COF) with periodic porous structures and tunable functionalities are a new class of crystalline polymers connected via strong covalent bonds. Constructing COF materials with high stability and porosity is attracting and essential for COFs' further functional exploration. In this work, two new covalent organic frameworks (TTA-TMTA-COF and TTA-FMTA-COF) with high surface area, large pore volume, and excellent chemical stability toward harsh conditions are designed and

Despite the enormous interest in Li metal as an ideal anode material, the uncontrollable Li dendrite growth and unstable solid electrolyte interphase have plagued its practical application. These limitations can be attributed to the sluggish and uneven Li⁺ migration towards Li metal surface. Here, we report olefin-linked covalent organic frameworks (COFs) with electronegative channels for facilitating selective Li⁺ transport. The triazine rings and fluorinated groups of the

A 2D sulfonated COF showed intrinsic proton conductivity up to 10 −3 at 25 °C and 100% relative humidity and high conductivity up to 10 −2 S cm −1 at 70 °C and 100% RH.

Covalent organic frameworks (COFs) with permanent porosity, long-range order and rigid backbones offer a promising material platform for photocatalytic water splitting for hydrogen production.

Light-emitting conjugated microporous polymers have been designed <italic>via</italic> an excited-state intramolecular proton transfer strategy for fluoride anion sensing.

By using a simple and universal process, we successfully synthesized various sulfonated porous organic polymers with high proton conductivity, and therefore this strategy could evolve structural designs for high proton-conductive materials.

Covalent-organic frameworks (COFs) are a new class of porous crystalline frameworks with high π-conjugation and periodical skeletons. The highly ordered π-conjugation structures in some COFs allow exciton migration and energy transfer over the frameworks, which leads to good fluorescence probing ability. In this work, two COFs (TFHPB-TAPB-COF and TFHPB-TTA-COF) are successfully condensed via the Schiff base condensation reaction. The intramolecular hydrogen bonds between imine bonds and hydroxyl