The electroluminescent (EL) features of oligothiophenes dispersed as a dopant in the host matrices comprising tris(8-hydroxyquinoline)aluminum have been investigated. We chose the oligothiophenes that are substituted with phenyl or methyl groups at both the molecular terminals and possess various degrees of polymerization. Regarding both the phenyl- and methyl-substituted materials, the EL spectra are progressively red-shifted with the increasing number of thiophenes. Comparing these spectra with the photoluminescent spectra, we have found out that the EL arises mostly from the dopant molecules of the oligothiophenes. The emission is dominated by energy transfer from host matrices to the dopant molecules, leading to the enhanced device efficiencies. The specific effects of the phenyl- or methyl-substitution and the extension of the π-delocalization in the molecules are also discussed.
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1 May 2002
Research Article|
May 01 2002
Electroluminescent features of oligothiophenes dispersed as a dopant in host matrices
Mutsumi Suzuki;
Mutsumi Suzuki
Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd., 3-10-1 Higashi-mita, Tama-ku, Kawasaki, Kanagawa 214-8501, Japan
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Masao Fukuyama;
Masao Fukuyama
Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd., 3-10-1 Higashi-mita, Tama-ku, Kawasaki, Kanagawa 214-8501, Japan
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Yoshikazu Hori;
Yoshikazu Hori
Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd., 3-10-1 Higashi-mita, Tama-ku, Kawasaki, Kanagawa 214-8501, Japan
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Shu Hotta
Shu Hotta
Joint Research Center for Harmonized Molecular Materials (JRCHMM)-Japan Chemical Innovation Institute (JCII), c/o National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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J. Appl. Phys. 91, 5706–5711 (2002)
Article history
Received:
August 27 2001
Accepted:
February 06 2002
Citation
Mutsumi Suzuki, Masao Fukuyama, Yoshikazu Hori, Shu Hotta; Electroluminescent features of oligothiophenes dispersed as a dopant in host matrices. J. Appl. Phys. 1 May 2002; 91 (9): 5706–5711. https://doi.org/10.1063/1.1465510
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