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Issue 23, 2012
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Phenanthroline diimide as an organic electron-injecting material for organic light-emitting devices

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Abstract

We report a diimide-type organic electron-injecting material, bis-[1,10]phenanthrolin-5-yl-pyromellitic diimide (Bphen-PMDI), for organic light-emitting devices (OLEDs), which was synthesized from its monomers, pyromellitic dianhydride (PMDA) and 1,10-phenanthrolin-5-amine (PTA). The vacuum-purified Bphen-PMDI powder showed high glass transition (∼230 °C) and thermal decomposition (∼400 °C) temperatures, whereas neither melting point nor particular long-range crystal nanostructures were observed from its solid samples. The optical band gap energy and the ionization potential of the Bphen-PMDI film were 3.6 eV and 6.0 eV, respectively, leading to the lowest unoccupied molecular orbital (LUMO) energy of 2.4 eV. Inserting a 1 nm thick Bphen-PMDI layer between the emission layer and the cathode layer improved the device current density by 10-fold and the luminance by 6-fold, compared to the OLED without the Bphen-PMDI layer. The result suggests that an effective electron tunnel injection process occurs through the Bphen-PMDI layer.

Graphical abstract: Phenanthroline diimide as an organic electron-injecting material for organic light-emitting devices

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Publication details

The article was received on 22 Mar 2012, accepted on 19 Jul 2012 and first published on 26 Jul 2012


Article type: Paper
DOI: 10.1039/C2RA20524F
Citation: RSC Adv., 2012,2, 8762-8767
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    Phenanthroline diimide as an organic electron-injecting material for organic light-emitting devices

    H. Lee, G. Cho, S. Woo, S. Nam, J. Jeong, H. Kim and Y. Kim, RSC Adv., 2012, 2, 8762
    DOI: 10.1039/C2RA20524F

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