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Aggregation of an n-π∗ Molecule Induces Fluorescence Turn-on

Title
Aggregation of an n-π∗ Molecule Induces Fluorescence Turn-on
Authors
Jhun B.H.Yi S.Y.Jeong D.Cho J.Park S.Y.You Y.
Ewha Authors
유영민
SCOPUS Author ID
유영민scopus
Issue Date
2017
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 121, no. 21, pp. 11907 - 11914
Publisher
American Chemical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
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.
DOI
10.1021/acs.jpcc.7b02797
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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