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Aggregation of an n-pi* Molecule Induces Fluorescence Turn-on

Title
Aggregation of an n-pi* Molecule Induces Fluorescence Turn-on
Authors
Jhun, Byung HakYi, Seung YeonJeong, DonghyunCho, JaeheungPark, Soo YoungYou, Youngmin
DGIST Authors
Jeong, Donghyun; Cho, Jaeheung
Issue Date
2017-06-01
Citation
Journal of Physical Chemistry C, 121(21), 11907-11914
Type
Article
Article Type
Article
Keywords
Activated Delayed FluorescenceAgglomerationAqueous SolutionEfficiencyElectroluminescencefluorescenceElectroluminescent MaterialsEnhanced EmissionExcited StatesFluorescence EmissionFluorophoresInter System CrossingsIntermolecular ArrangementsIntramolecular Charge TransferLight Emitting Diodes (LED)Magnitude EnhancementMechanismMoleculesPhotoluminescence Quantum YieldsQuantum Chemical InvestigationQuantum ChemistryQuantum TheorySinglet and Triplet ExcitonsSolid State Emission
ISSN
1932-7447
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/4160
DOI
10.1021/acs.jpcc.7b02797
Publisher
American Chemical Society
Related Researcher
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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