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Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy (ULSaN Lab)
Research Interests
  • Femtochemistry/biology, 4D electron microscopy, structural dynamics, materials phenomena

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Imidazole-based excited-state intramolecular proton-transfer(ESIPT) materials: Observation of thermally activated delayed fluorescence(TDF)

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Title
Imidazole-based excited-state intramolecular proton-transfer(ESIPT) materials: Observation of thermally activated delayed fluorescence(TDF)
Author
Park, SanghyukKwon, Oh HoonLee, Young-ShinJang, Du-JeonPark, Soo Young
Issue Date
2007-10
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY A, v.111, no.39, pp.9649 - 9653
Abstract
We report the first observation of thermally activated delayed fluorescence (TDF) from an excited-state intramolecular proton-transfer (ESIPT) molecule, a hydroxyl-substituted tetraphenyl imidazole derivative (HPIAc), in degassed solutions as well as in low-temperature organic matrixes. In the absence of oxygen, the blue emission of an identical spectral feature was observed in the nanosecond (∼4.4 ns) and microsecond (∼25 /is) time domains, and the fluorescence intensity increased with temperature. From the temperature dependence of the time-resolved spectra of HPI-Ac, the energy gap between the first-excited singlet state and the lowest triplet state was determined to be 7.6 ±0.3 kJ/mol (630 ± 25 cm -1), and the limiting rate constant of intrinsic reverse intersystem crossing was estimated to be 1.3 (±0.5) × 10 7 s -1.
URI
https://scholarworks.unist.ac.kr/handle/201301/8758
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=35348945806
DOI
10.1021/jp072212p
ISSN
1089-5639
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CHM_Journal Papers
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