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Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices

Title
Diimide nanoclusters play hole trapping and electron injection roles in organic light-emitting devices
Authors
Cho, GwijeongLee, HyenaWoo, SunghoNam, SunghoKim, HwajeongKim, Youngkyoo
DGIST Authors
Woo, Sungho
Issue Date
2011
Citation
Nanoscale, 3(3), 1073-1077
Type
Article
Article Type
Article
Keywords
Amine MoietiesChemistryCurrent DensityDiimideElectron InjectionElectron TransportElectron Transport LayersEquipmentEquipment DesignEquipment Failure AnalysisGlass TransitionGlass Transition TemperatureHole TrappingHole TrapsIlluminationImideImidesInstrumentationLight EmissionLightingMaterials TestingNano-StructuresNanoclustersNanomaterialOrganic ChemicalsOrganic CompoundOrganic Light-Emitting DevicesParticle SizeSemiconductorSemiconductorsThermally StableUltrastructureWide Band Gap
ISSN
2040-3364
Abstract
We report thermally stable diimide nanoclusters that could potentially replace the conventional thick electron transport layer (ETL) in organic light-emitting devices (OLEDs). Bis-[1,10]phenanthrolin-5-yl-bicyclo[2.2.2]oct- 7-ene-2,3,5,6-tetracarboxylic diimide (Bphen-BCDI) was synthesized from the corresponding dianhydride and amine moieties, and its purified product exhibited a high glass transition temperature (232 °C) and a wide band gap (3.8 eV). The Bphen-BCDI subnanolayers deposited on substrates were found to form organic nanoclusters, not a conventional layer. The OLED made with a subnanolayer of Bphen-BCDI nanoclusters, instead of a conventional ETL, showed greatly improved efficiency (about 2-fold) compared with an OLED without the diimide nanoclusters. The role of the BPhen-BCDI nanoclusters was assigned to hole trapping and electron injection in the present OLED structure. © 2011 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/5403
DOI
10.1039/c0nr00496k
Publisher
Royal Society of Chemistry
Related Researcher
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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