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Phenanthroline diimide as an organic electron-injecting material for organic light-emitting devices
- Phenanthroline diimide as an organic electron-injecting material for organic light-emitting devices
- Lee, H[Lee, Hyena]; Cho, G[Cho, Gwijeong]; Woo, S[Woo, Sungho]; Nam, S[Nam, Sungho]; Jeong, J[Jeong, Jaehoon]; Kim, H[Kim, Hwajeong]; Kim, Y[Kim, Youngkyoo]
- DGIST Authors
- Woo, S[Woo, Sungho]; Jeong, J[Jeong, Jaehoon]
- Issue Date
- RSC Advances, 2(23), 8762-8767
- Article Type
- Current Density; Decomposition; Effective Electrons; Electron Injection; Emission Layers; Energy Gap; Glass Transition; Ionization Potential; Light Emission; Lowest Unoccupied Molecular Orbital; Molecular Orbitals; Optical Band-Gap Energy; Organic Light-Emitting Devices; Phenanthrolines; Pyromellitic Dianhydride; Tunnel Injection
- 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. © The Royal Society of Chemistry 2012.
- Royal Society of Chemistry
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