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권오훈

Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy Lab.
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Crystallization-Induced Emission Enhancement and Amplified Spontaneous Emission from a CF3-Containing Excited-State Intramolecular-Proton-Transfer Molecule

Author(s)
Park, SanghyukKwon, Ji EonPark, Sun-YoungKwon, Oh-HoonKim, Joon KiYoon, Seung-JunChung, Jong WonWhang, Dong RyeolPark, Sang KyuLee, Dong KiJang, Du-JeonGierschner, JohannesPark, Soo Young
Issued Date
2017-09
DOI
10.1002/adom.201700353
URI
https://scholarworks.unist.ac.kr/handle/201301/22707
Fulltext
http://onlinelibrary.wiley.com/doi/10.1002/adom.201700353/full
Citation
ADVANCED OPTICAL MATERIALS, v.5, no.18, pp.1700353
Abstract
In this work, a simple but effective molecular design strategy is developed for the generation of intense blue emission in the solid state including single crystals through the multiple secondary intermolecular interactions such as CF...HC hydrogen bonding. The synthesized novel imidazole-based excited-state intramolecular proton transfer (ESIPT) molecule, 2-(1-(3,5-bis(trifluoromethyl)phenyl)-4,5-diphenyl-1H-imidazol-2-yl)phenol (HPI-CF3), shows significantly enhanced blue fluorescence in single crystal (phi(F) = 0.67) compared to faint emission in solution (phi(F) < 0.05). It is considered that tight but slipped stacking structure of HPI-CF3 molecules in the single crystal not only effectively suppresses the nonradiative decay pathways such as twist intramolecular charge transfer but also induces highly allowed transition character. Taking advantage of the crystallization-induced emission enhancement characteristics and four-level ESIPT photocycle process of HPI-CF3, an efficient amplified spontaneous emission at 475 nm with a threshold of 13.1 mJ cm(-2) is observed from the single crystal by picosecond laser optical pumping.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
2195-1071
Keyword (Author)
amplified spontaneous emissioncrystallization-induced emission enhancementexcited-state intramolecular proton transferfluorescencesolid-state emitter
Keyword
AGGREGATION-INDUCED EMISSIONLIGHT-EMITTING-DIODESSOLID-STATECHARGE-TRANSFERSTIMULATED-EMISSIONCONJUGATED POLYMERSFLUORESCENCE EMISSIONSINGLE-CRYSTALSESIPTDISTYRYLBENZENE

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