A Caltech Library Service

Imidazole-Based Excited-State Intramolecular Proton-Transfer (ESIPT) Materials: Observation of Thermally Activated Delayed Fluorescence (TDF)

Park, Sanghyuk and Kwon, Oh-Hoon and Lee, Young-Shin and Jang, Du-Jeon and Park, Soo Young (2007) Imidazole-Based Excited-State Intramolecular Proton-Transfer (ESIPT) Materials: Observation of Thermally Activated Delayed Fluorescence (TDF). Journal of Physical Chemistry A, 111 (39). pp. 9649-9653. ISSN 1089-5639. doi:10.1021/jp072212p.

[img] PDF - Supplemental Material
See Usage Policy.


Use this Persistent URL to link to this item:


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 (∼4.4 ns) and microsecond (∼25 μs) 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).

Item Type:Article
Related URLs:
URLURL TypeDescription ItemDiscussion Paper
Kwon, Oh-Hoon0000-0001-7114-8617
Additional Information:© 2007 American Chemical Society. Received 20 March 2007. Published online 31 August 2007. Published in print 1 October 2007. This work was supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Laboratory Program funded by the Ministry of Science and Technology (No. 2006-03246). D.-J.J. and Y.-S.L. thank the Korea Research Foundation for Grant KRF-2004-015-C00230 and the Brain Korea 21 Program, respectively.
Funding AgencyGrant Number
Korea Science and Engineering Foundation2006-03246
National Research Foundation of KoreaKRF-2004-015-C00230
Brain Korea 21 ProgramUNSPECIFIED
Issue or Number:39
Record Number:CaltechAUTHORS:20170609-111412966
Persistent URL:
Official Citation:Imidazole-Based Excited-State Intramolecular Proton-Transfer (ESIPT) Materials:  Observation of Thermally Activated Delayed Fluorescence (TDF) Sanghyuk Park, Oh-Hoon Kwon, Young-Shin Lee, Du-Jeon Jang, and Soo Young Park The Journal of Physical Chemistry A 2007 111 (39), 9649-9653 DOI: 10.1021/jp072212p
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78056
Deposited By: Ruth Sustaita
Deposited On:09 Jun 2017 21:29
Last Modified:15 Nov 2021 17:36

Repository Staff Only: item control page