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

Byung Hak Jhun, Seung Yeon Yi, Donghyun Jeong, Jaeheung Cho, Soo Young Park, Youngmin You

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.

Original languageEnglish
Pages (from-to)11907-11914
Number of pages8
JournalJournal of Physical Chemistry C
Volume121
Issue number21
DOIs
StatePublished - 1 Jun 2017

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