研究目的
To achieve dual-emissive and time-dependent evolutive organic afterglow by bridging molecules with weak intermolecular hydrogen bonding, enabling real-time changing emission colors for potential applications in data storage, antifaking, encryption, and bioimaging.
研究成果
The research successfully demonstrated a single-component organic material (SOBF-OMe) with dual-emissive afterglow properties, achieved through intermolecular hydrogen bonding. This enables real-time color changes from cold-white to orange during decay, due to different lifetimes of pRTP and intermolecular charge transfer emissions. The material shows sensitivity to mechanical stimuli, allowing manipulation of emission properties. This novel approach opens avenues for applications in information encryption and antifaking, providing a new strategy for designing advanced light-emitting materials.
研究不足
The study is limited to specific organic compounds (SOBF-H and SOBF-OMe) and may not generalize to other materials. The mechanoresponsive properties rely on crystal packing, which could be sensitive to environmental conditions. The afterglow lifetimes and quantum yields might be optimized further for practical applications.
1：Experimental Design and Method Selection:
The study involved designing and synthesizing two dibenzofuran-containing sulfonyldibenzene derivatives (SOBF-H and SOBF-OMe) to investigate the effects of intermolecular hydrogen bonding on afterglow properties. Methods included single-crystal X-ray diffraction (XRD) for structural analysis, photophysical studies (UV-vis absorption, emission spectra, delayed emission), time-dependent density functional theory (TD-DFT) calculations, and mechanoresponsive tests.
2：Sample Selection and Data Sources:
Samples were synthesized compounds SOBF-H and SOBF-OMe. Single crystals were grown by recrystallization from dichloromethane and methanol mixtures. Data were obtained from spectroscopic measurements and computational simulations.
3：List of Experimental Equipment and Materials:
Equipment included XRD for crystal structure analysis, UV-vis and fluorescence spectrometers for photophysical studies, and equipment for grinding and fuming tests. Materials included solvents like THF, toluene, cyclohexane, and the synthesized compounds.
4：Experimental Procedures and Operational Workflow:
Procedures involved synthesizing SOBF-H and SOBF-OMe, growing single crystals, performing XRD to analyze intermolecular interactions, measuring absorption and emission spectra in various states (solution, crystalline, ground, fumed), conducting temperature-dependent emission decay studies, and TD-DFT calculations to confirm emission origins. Mechanoresponsive properties were tested by grinding and fuming samples and measuring changes in afterglow.
5：Data Analysis Methods:
Data were analyzed using spectroscopic techniques to determine emission wavelengths, lifetimes, and quantum yields. TD-DFT calculations at B3LYP/6-31G* level were used to study electronic structures. Statistical analysis of emission changes over time was performed.
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