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Investigation of charge-transporting layers for high-efficiency organic light-emitting diode
| Content Provider | Scilit |
|---|---|
| Author | Jou, Jwo-Huei Weng, Jia-Wei Chavhan, Sudam Dhudaku Yadav, Rohit Ashok Kumar Liang, Tzu-Wei |
| Copyright Year | 2018 |
| Description | Journal: Journal of Physics D: Applied Physics In the present work, we study a comprehensive model to quantitatively investigate the role of charge transporting materials on exciton recombination and electric field distribution across the emissive and electron transporting layers (ETL) in organic light-emitting diode (OLED) devices via electrical simulation. The devices are composed of 4,4',4"-tris(carbazol-9-yl)triphenylamine (TCTA) and 4, 4'-bis(carbazol-9-yl) biphenyl (CBP) hosts, bathophenanthroline (Bphen) and 2,2',2"-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) as electron transporting materials (ETMs), and 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) as a hole transporting material (HTM). The outcomes reveal that the recombination rate across the EML is highly influenced by the charge carrier mobility of ETMs. The Bphen based device exhibits a maximum recombination rate of 3.5 x 106 cm-3s-1, which is 105 times higher than the TPBi composed device. The recombination rate is increased by order of two magnitude by incorporating a TAPC for hole transport layer. It is increased from 1.9 x 106 to 3.5 x 106 cm3s-1 as the host is changed from TCTA to CBP. Whilst, the electric field distribution decreased from 0.28 to 0.17 MV*cm-1 across the TCTA emissive layer in presence of HTL, however, it increased 0.36 MV*cm-1 when TCTA emissive layer was replaced with CBP. Experimentally, the Bphen based device exhibits a power efficiency of 12.5 lm/W and an EQE of 5.1 %, which are higher than those of the TPBi counterpart. |
| Related Links | http://iopscience.iop.org/article/10.1088/1361-6463/aad951/pdf |
| ISSN | 00223727 |
| e-ISSN | 13616463 |
| DOI | 10.1088/1361-6463/aad951 |
| Journal | Journal of Physics D: Applied Physics |
| Issue Number | 45 |
| Volume Number | 51 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2018-08-09 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics D: Applied Physics Condensed Matter Physics Transporting Layers |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Acoustics and Ultrasonics Condensed Matter Physics Electronic, Optical and Magnetic Materials |
