研究目的
To achieve highly efficient ultralong organic phosphorescence (UOP) in metal-free organic materials by subtly tailoring the structure of triazine luminogens through variations in bromine substituted positions.
研究成果
Subtle structural tailoring of bromine positions in triazine isomers enables highly efficient UOP, with p-BrAT achieving a phosphorescence efficiency of 9.7% and lifetime of 386 ms. This is attributed to enhanced radiative transitions and H-aggregation stabilization, providing a strategy for developing efficient metal-free UOP materials for applications in organic electronics and bio-electronics.
研究不足
The study is limited to specific triazine-based isomers; generalizability to other metal-free systems may require further investigation. Environmental factors like humidity and oxygen could affect phosphorescence, and scalability for practical applications is not addressed.
1：Experimental Design and Method Selection:
Designed and synthesized three isomers (o-BrAT, m-BrAT, p-BrAT) based on asymmetric triazines with different bromine positions to study their UOP properties. Used X-ray single crystal analysis and theoretical calculations (TD-DFT) to understand mechanisms.
2：Sample Selection and Data Sources:
Synthesized compounds via two-step reactions, characterized by NMR, MALDI-TOF MS, elemental analysis, and single-crystal X-ray diffraction. Photophysical properties measured in solution and solid state.
3：List of Experimental Equipment and Materials:
Compounds synthesized from chemical reagents; equipment includes NMR spectrometer, MALDI-TOF mass spectrometer, X-ray diffractometer, fluorescence spectrophotometer with integrating sphere for quantum yield measurements, and computational resources for TD-DFT.
4：Experimental Procedures and Operational Workflow:
Synthesized isomers, purified and characterized. Measured absorption, steady-state photoluminescence, phosphorescence spectra, lifetimes, and quantum yields in solution and solid state under ambient conditions and at 77 K. Conducted oxygen-dependent experiments to confirm phosphorescence.
5：Data Analysis Methods:
Analyzed spectral data, calculated radiative and non-radiative decay rates, performed TD-DFT calculations to determine oscillator strengths, spin-orbit coupling, and excitation energies.
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