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Red Phosphorescent Organic Light-Emitting Diodes Using Mixture System of Small-Molecule and Polymer Host
| Content Provider | Scilit |
|---|---|
| Author | Hino, Yuichi Kajii, Hirotake Ohmori, Yutaka |
| Copyright Year | 2005 |
| Description | Journal: Japanese Journal of Applied Physics We study two types of polymer materials, poly(n-vinylcarbazole) (PVK) and starburst small-molecule 1,3,5-tris[4-(diphenylamino)phenyl]benzene (TDAPB), as the host for electrophosphorescent organic light-emitting diodes (PHOLEDs) doped with red-emitting phosphor tris(1-phenylisoquinoline) iridium (III) $[Ir(piq)_{3}$]. PHOLEDs employed a PVK and TDAPB blend as the host exhibited a maximum red light emission at a wavelength of 630 nm. The external quantum efficiency of 6.3% and power efficiency of 3.0 lm/W have been achieved. The electroluminescent (EL) spectra were not changed at high current and the luminance reached 8,800 $cd/m^{2}$ at the voltage of 13 V. We found that the roughness of the surface as estimated by means of atomic force microscopy (AFM) smoothened with increasing TDAPB doping concentration, and a slight exciplex emission between TDAPB and an electron transport material 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4,-oxadiazole (PBD) was observed at the wavelength of approximately 530 nm. |
| Related Links | http://pdfs.semanticscholar.org/8a78/3d8eaa0fb59ee437fa210a8f070c32d1429f.pdf http://iopscience.iop.org/article/10.1143/JJAP.44.2790/pdf |
| Ending Page | 2794 |
| Page Count | 5 |
| Starting Page | 2790 |
| ISSN | 00214922 |
| e-ISSN | 13474065 |
| DOI | 10.1143/jjap.44.2790 |
| Journal | Japanese Journal of Applied Physics |
| Issue Number | 4S |
| Volume Number | 44 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2005-04-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Japanese Journal of Applied Physics Electron Transport Atomic Force Microscopy Organic Light Emitting Diode External Quantum Efficiency Electroluminescence |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy Engineering |
