Cited 2 time in webofscience Cited 2 time in scopus

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
Authors
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
2012
Citation
RSC Advances, 2(23), 8762-8767
Type
Article
Article Type
Article
Keywords
Current DensityDecompositionEffective ElectronsElectron InjectionEmission LayersEnergy GapGlass TransitionIonization PotentialLight EmissionLowest Unoccupied Molecular OrbitalMolecular OrbitalsOptical Band-Gap EnergyOrganic Light-Emitting DevicesPhenanthrolinesPyromellitic DianhydrideTunnel 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
Files:
There are no files associated with this item.
Collection:
School of Undergraduate Studies1. Journal Articles


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE