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Electrical and electroluminescent properties of poly(p-phenylene vinylene) LB films based LEDs using aluminum metal as the electrode |
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| Authors: | Aiping Wu Takenori Fujiwara Masa-aki Kakimoto Yoshio Imai Tohru Kubota Mitsumasa Iwamoto |
| Affiliation: | a Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152, Japan b Department of Physical Electronics, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152, Japan |
| Abstract: | The electrical properties of poly(p-phenylene vinylene) (PPV) Langmuir-Blodgett (LB) films were investigated, wherein transparent indium-tin oxide (ITO) and aluminum (Al) were used as the electrodes. Their I–V characteristics depended strongly on the thickness of PPV LB film, and the electric conductivity of the PPV LB film was in the range of 10−2–10−15 (S/cm). Their C–V characteristics showed that the capacitance was reversibly proportional to the thickness of PPV LB film and was kept constant when the applied voltage changed from −1.0 V to +1.0 V. These results indicated that PPV LB film was an insulator in this range of applied voltage without doping. Under forward bias, yellow-green light emission was observed in PPV LB film based light emitting diodes (LEDs), the highest light emission reached more than 100 cd/m2 in the case that PPV LB film was deposited for 80 layers, i.e. a ITO/PPV(80L)/Al device. |
| Keywords: | Electroluminescence Langmuir-Blodgett films Photoluminescence Light emitting diodes Poly(p-phenylene vinylene) |
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