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

Title
Phenanthroline diimide as an organic electron-injecting material for organic light-emitting devices
Author(s)
Lee, HyenaCho, GwijeongWoo, SunghoNam, SunghoJeong, JaehoonKim, HwajeongKim, Youngkyoo
Issued Date
2012
Citation
RSC Advances, v.2, no.23, pp.8762 - 8767
Type
Article
Keywords
AL/LIF ELECTRODECurrent DensityDecompositionEffective ElectronsELECTROLUMINESCENT DIODESElectron Injectionemission LayersEnergy GapGlass TransitionIonization PotentialLight emissionLowest Unoccupied Molecular OrbitalMolecular OrbitalsOptical Band Gap EnergyOrganic Light-emitting DevicesPERFORMANCEPhenanthrolinesPyromellitic DianhydrideSOLAR-CELLSTunnel Injection
ISSN
2046-2069
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. © The Royal Society of Chemistry 2012.
URI
http://hdl.handle.net/20.500.11750/3420
DOI
10.1039/c2ra20524f
Publisher
Royal Society of Chemistry
Related Researcher
  • 우성호 Woo, Sungho
  • Research Interests Photovoltaic; 태양전지; Supercapacitor; 슈퍼커패시터; Organic electronics; 유기반도체; Display; 디스플레이 소재 및 공정; Nanomaterials; 나노소재합성 및 응용
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Appears in Collections:
Division of Energy & Environmental Technology 1. Journal Articles

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