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Aggregation of an n-pi* Molecule Induces Fluorescence Turn-on
- Aggregation of an n-pi* Molecule Induces Fluorescence Turn-on
- Jhun, Byung Hak; Yi, Seung Yeon; Jeong, Donghyun; Cho, Jaeheung; Park, Soo Young; You, Youngmin
- DGIST Authors
- Jeong, Donghyun; Cho, Jaeheung
- Issue Date
- Journal of Physical Chemistry C, 121(21), 11907-11914
- Article Type
- Activated Delayed Fluorescence; Agglomeration; Aqueous Solution; Efficiency; Electroluminescencefluorescence; Electroluminescent Materials; Enhanced Emission; Excited States; Fluorescence Emission; Fluorophores; Inter System Crossings; Intermolecular Arrangements; Intramolecular Charge Transfer; Light Emitting Diodes (LED); Magnitude Enhancement; Mechanism; Molecules; Photoluminescence Quantum Yields; Quantum Chemical Investigation; Quantum Chemistry; Quantum Theory; Singlet and Triplet Excitons; Solid State Emission
- Although n-π∗ molecules can serve as electroluminescent materials because of the harvesting of singlet and triplet excitons through El-Sayed-rule-allowed reverse intersystem crossing, the weak fluorescence emissions of such molecules have prevented applications into devices. We have discovered a 1 order of magnitude enhancement of the fluorescence of a prototypical n-π∗ fluorophore, 7-phenylcoumarin (PC), upon aggregation. We performed a mechanistic study consisting of structural, photophysical, and quantum chemical investigations, and found that the aggregation positioned the fluorescent electronic state below the nonemissive triplet n-π∗ transition state. Our studies, for the first time, demonstrate intramolecular geometry and intermolecular arrangements in the solid state to be significant factors in the photoluminescence quantum yields of n-π∗ fluorophores. © 2017 American Chemical Society.
- American Chemical Society
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