Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode
Blending; 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 morphol...
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2023
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my.uniten.dspace-228252023-05-29T14:12:30Z Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode Talik N.A. Woon K.L. Yap B.K. 55576358000 12041961200 26649255900 Blending; 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 mobility We 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. Final 2023-05-29T06:12:30Z 2023-05-29T06:12:30Z 2016 Article 10.1088/0022-3727/49/15/155103 2-s2.0-84962245982 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84962245982&doi=10.1088%2f0022-3727%2f49%2f15%2f155103&partnerID=40&md5=165a22d60c3097fed643a8fb2c11ba24 https://irepository.uniten.edu.my/handle/123456789/22825 49 15 155103 Institute of Physics Publishing Scopus |
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Blending; 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 mobility |
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55576358000 Talik N.A. Woon K.L. Yap B.K. |
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Article |
| author |
Talik N.A. Woon K.L. Yap B.K. |
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Talik N.A. Woon K.L. Yap B.K. Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode |
| author_sort |
Talik N.A. |
| title |
Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode |
| title_short |
Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode |
| title_full |
Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode |
| title_fullStr |
Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode |
| title_full_unstemmed |
Effect of mixed hole transporting host on the mobility, Gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode |
| title_sort |
effect of mixed hole transporting host on the mobility, gaussian density of states and efficiencies of a heterojunction phosphorescent organic light emitting diode |
| publisher |
Institute of Physics Publishing |
| publishDate |
2023 |
| _version_ |
1806426412193677312 |
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13.214268 |