Electrical and electroluminescent properties of poly(p-phenylene vinylene) LB films based LEDs using aluminum metal as the electrode
✍ Scribed by Aiping Wu; Takenori Fujiwara; Masa-aki Kakimoto; Yoshio Imai; Tohru Kubota; Mitsumasa Iwamoto
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 493 KB
- Volume
- 30
- Category
- Article
- ISSN
- 1381-5148
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✦ Synopsis
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 10-1~-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 -I .O V to +I .O V. These results indicated that PPV LB film was an insulator in this range of applied voltage without dopin g. 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/m' in the case that PPV LB film was deposited for 80 layers, i.e. a ITO/PPV(80L)/AI device.