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

Imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials: observation of thermally activated delayed fluorescence (TDF). Research Abstract Details 

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Imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials: observation of thermally activated delayed fluorescence (TDF). Abstract Text:

Sanghyuk Park,Oh-Hoon Kwon,Young-Shin Lee,Du-Jeon Jang,Soo Young Park,

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 (HPI-Ac), 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 ( approximately 4.4 ns) and microsecond ( approximately 25 micros) 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) x 107 s-1.

Imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials: observation of thermally activated delayed fluorescence (TDF). Publishing Authors By Initials

S Park,OH Kwon,YS Lee,DJ Jang,SY Park,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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Imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials: observation of thermally activated delayed fluorescence (TDF). Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The journal of physical chemistry. A

VOLUME: 111

Page Numbers: 9649-53

Journal Abbreviation:

ISSN: 1089-5639

DAY: 31

MONTH: 08

YEAR: 2007

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

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LANGUAGE: eng

NlmUniqueID: 9890903

Imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials: observation of thermally activated delayed fluorescence (TDF). Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: methods

Chemical & Substance for Abstract: Imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials: observation of thermally activated delayed fluorescence (TDF). Information

Substance Name: imidazole

Registry Number: 288-32-4

Grant and Affiliation Information for Imidazole-based excited-state intramolecular proton-transfer (ESIPT) materials: observation of thermally activated delayed fluorescence (TDF).

AFFILIATION: Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744, Korea.

Country: United States

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MEDLINETA: J Phys Chem A

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