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Verified CAS / Academic Author2 Decoded Studies

Prof. ZHANG Senyu

Nanjing University of Posts and Telecommunications

Research Publications & English Decoded Briefs

Showing 2 publications
SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-026-4495-3

Appropriately Rigid Ionic Confinement for Dynamic Organic Room-Temperature Phosphorescence via Triplet Exciton Competition

Room-temperature phosphorescence (RTP) has attracted substantial interest for applications in smart optoelectronics, yet the development of dynamic RTP systems remains intrinsically challenging. Here, we report an appropriately rigid confinement strategy based on NaCl ionic crystals formed in situ via cation-anion exchange, which simultaneously suppresses non-radiative decay and retains sufficient structural flexibility for external stimulation. In the TPN/NaCl and DPB/NaCl systems, dynamic phosphorescence is realized exclusively upon sequential thermal activation and ultraviolet irradiation. Mechanistic investigations reveal that residual water and triplet oxygen initially quench triplet excitons, and their gradual removal enables a competitive evolution between triplet-triplet annihilation (TTA) and phosphorescence pathways. This work establishes a general design principle for constructing stimulus-responsive dynamic RTP systems and resolves the long-standing conflict between rigidity and responsiveness in organic phosphorescent materials.

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SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3391-0

Redox-Mediated Stabilization of Ultrasmall Au25 Nanoclusters in Amine-Functionalized MOF for Robust Photocatalytic Antibacterial Applications

Noble metal nanoclusters (MNCs) possess atomically precise structures and tunable compositions, yet their practical deployment is constrained by rapid oxidation-induced structural degradation and ligand detachment, leading to aggregation during storage and catalysis. This study introduces a redox-mediated stabilization strategy by integrating ultrasmall Au25 nanoclusters with amine-functionalized UiO-66-NH2. The uniformly dispersed amine groups act as reductive reagents, suppressing Au oxidation while reinforcing thiol-terminated ligand anchoring via dynamic coordination. This dual stabilization preserves the initial ultrasmall size and structural integrity of Au25 NCs under ambient storage and light irradiation. The engineered type-II heterojunction between Au25 NCs and UiO-66-NH2 enhances visible-light harvesting and charge separation, enabling efficient O2 activation to reactive oxygen species (ROS). The Au25/UiO-66-NH2 composites achieve 99.999% bacterial inactivation against Escherichia coli within 40 min under visible light, retaining high efficacy after five reuse cycles. Integration into wearable fabrics demonstrates potential for continuous antibacterial protection. This work establishes amine-functionalized MOFs as universal redox-active supports for stabilizing metastable MNCs, offering a versatile platform for durable photocatalytic systems in environmental and biomedical applications.

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