| Autor: |
Al-Asbahi BA; Department of Physics and Astronomy, Collage of Science, King Saud University, Riyadh 11451, Saudi Arabia. alasbahibandar@gmail.com.; Department of Physics, Faculty of Science, Sana'a University, PO Box 12544, Sana'a, Yemen. alasbahibandar@gmail.com., Haji Jumali MH; School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor 43600, Malaysia. hafizhj@ukm.edu.my., AlSalhi MS; Department of Physics and Astronomy, Collage of Science, King Saud University, Riyadh 11451, Saudi Arabia. malsalhy@gmail.com.; Research Chair in Laser Diagnosis of Cancers, Collage of Science, King Saud University, Riyadh 11451, Saudi Arabia. malsalhy@gmail.com. |
| Abstrakt: |
The effect of TiO₂ nanoparticle (NP) content on the improvement of poly(9,9'-di- n -octylfluorenyl-2,7-diyl) (PFO)/Fluorol 7GA organic light emitting diode (OLED) performance is demonstrated here. The PFO/Fluorol 7GA blend with specific ratios of TiO₂ NPs was prepared via a solution blending method before being spin-coated onto an indium tin oxide (ITO) substrate to act as an emissive layer in OLEDs. A thin aluminum layer as top electrode was deposited onto the emissive layer using the electron beam chamber. Improvement electron injection from the cathode was achieved upon incorporation of TiO₂ NPs into the PFO/Fluorol 7GA blend, thus producing devices with intense luminance and lower turn-on voltage. The ITO/(PFO/Fluorol 7GA/TiO₂)/Al OLED device exhibited maximum electroluminescence intensity and luminance at 25 wt % of TiO₂ NPs, while maximum luminance efficiency was achieved with 15 wt % TiO₂ NP content. In addition, this work proved that the performance of the devices was strongly affected by the surface morphology, which in turn depended on the TiO₂ NP content. |
