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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3395
Title: Green and yellow electroluminescent dipolar carbazole derivatives: Features and benefits of electron-withdrawing segments
Authors: Thomas K.R.J.
Lin J.T.
Tao Y.-T.
Chuen C.-H.
Published in: Chemistry of Materials
Abstract: New multiply substituted carbazole derivatives containing fluorene or phenylene conjugated oxadiazole segments and quinoxaline units were obtained by palladium-catalyzed C-N coupling reactions. They are amorphous with the glass transition temperature (Tg) in the range 104-176°C. The emission color of the materials varies from blue to yellow and is dependent on the nature of the electron-withdrawing segments and solvents. Two reversible one-electron oxidations were observed for these molecules in cyclic voltammograms, which originate from the peripheral 3,6-diarylamino units in the 3,6,9-trisubstituted derivatives and diarylamine and carbazole segments in the 3,9-disubstituted compounds. Reductions originating from quinoxaline segments were also located for the molecules incorporating quinoxaline moieties. The double-layer organic light-emitting diodes fabricated using these compounds as hole-transporting/emitting layers and TPBI or Alq3 as an electron-transporting layer emit bluish green to yellow colors. The recombination zone is restricted in the HTL layer for the quinoxaline-containing molecules irrespective of the electron-transporting layer used and emission occurs from them. However, for the oxadiazole derivatives emission in the Alq3-based devices is either red-shifted or resembles that of Alq3-Cyclic voltammetric and spectroscopic data support more pronounced electron affinity for the quinoxaline-incorporated carbazole derivatives than for the oxadiazole-tethered carbazole materials.
Citation: Chemistry of Materials (2002), 14(9): 3852-3859
URI: https://doi.org/10.1021/cm0202512
http://repository.iitr.ac.in/handle/123456789/3395
Issue Date: 2002
ISSN: 8974756
Author Scopus IDs: 57203389297
7501725859
7402420315
6701637461
Author Affiliations: Thomas, K.R.J., Institute of Chemistry, Academia Sinica, 115 Nankang, Taipei, Taiwan
Lin, J.T., Institute of Chemistry, Academia Sinica, 115 Nankang, Taipei, Taiwan, Department of Chemistry, National Central University, 320 Chungli, Taiwan
Tao, Y.-T., Institute of Chemistry, Academia Sinica, 115 Nankang, Taipei, Taiwan
Chuen, C.-H., Institute of Chemistry, Academia Sinica, 115 Nankang, Taipei, Taiwan
Corresponding Author: Lin, J.T.; Institute of Chemistry, Academia Sinica, 115 Nankang, Taipei, Taiwan; email: jtlin@chem.sinica.edu.tw
Appears in Collections:Journal Publications [CY]

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