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Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode

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dc.citedby6
dc.contributor.authorTalik N.A.en_US
dc.contributor.authorWoon K.L.en_US
dc.contributor.authorYap B.K.en_US
dc.contributor.authorid55576358000en_US
dc.contributor.authorid12041961200en_US
dc.contributor.authorid26649255900en_US
dc.date.accessioned2023-05-29T06:12:30Z
dc.date.available2023-05-29T06:12:30Z
dc.date.issued2016
dc.descriptionBlending; Charge injection; Efficiency; Heterojunctions; Hole concentration; Hole traps; Light emission; Light emitting diodes; Molecules; Morphology; Organic light emitting diodes (OLED); Phosphorescence; Semiconductor doping; Doping concentration; Energetic disorder; Film homogeneity; Film morphology; Gaussian density of state; Hole transporting; Phosphorescent organic light emitting diodes; Polyvinylcarbazole; Hole mobilityen_US
dc.description.abstractWe present an in-depth study of the hole transport in poly(vinylcarbazole) PVK films blended with small molecule tris(4-carbazoyl-9-ylphenyl)amine (TcTa). Doping TcTa in PVK introduces shallow hole traps when the doping concentration is lower than 20 wt%. It becomes percolative at higher concentrations. The energetic disorder ? of the blended system reduces from ?72 meV at 0 wt% TcTa to ?41 meV at 50 wt% TcTa. A correlation between ? and the film morphologies suggests that the blending of TcTa molecules in the film does not only change the film homogeneity and roughness but also the energetic disorder. In addition to the mobility study, we fabricated a red phosphorescent organic light emitting diode with the same blending system. By doping merely 5 wt% of TcTa into PVK as mixed hole-transporting hosts, the efficiency of the deep red heterojunction phosphorescent organic light emitting diode increased from 2 cd A-1 to 4 cd A-1, suggesting that TcTa molecules assist in hole injection. � 2016 IOP Publishing Ltd.en_US
dc.description.natureFinalen_US
dc.identifier.ArtNo155103
dc.identifier.doi10.1088/0022-3727/49/15/155103
dc.identifier.issue15
dc.identifier.scopus2-s2.0-84962245982
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84962245982&doi=10.1088%2f0022-3727%2f49%2f15%2f155103&partnerID=40&md5=165a22d60c3097fed643a8fb2c11ba24
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/22825
dc.identifier.volume49
dc.publisherInstitute of Physics Publishingen_US
dc.sourceScopus
dc.sourcetitleJournal of Physics D: Applied Physics
dc.titleEffect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diodeen_US
dc.typeArticleen_US
dspace.entity.typePublication
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