Langmuir-Blodgett films of conjugated polymers: electroluminescence and charge transport mechanisms
| Autor: | T. Östergård, Amlan J. Pal, Ronald Österbacka, J. Paloheimo, Henrik Stubb |
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| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Conductive polymer Electron mobility Materials science business.industry Heterojunction Polymer Electroluminescence Langmuir–Blodgett film Atomic and Molecular Physics and Optics law.invention chemistry law Optoelectronics Electrical and Electronic Engineering business Diode Light-emitting diode |
| Zdroj: | IEEE Journal of Selected Topics in Quantum Electronics. 4:137-143 |
| ISSN: | 1077-260X |
| DOI: | 10.1109/2944.669489 |
| Popis: | This paper reviews and reports our work on the development of polymeric light-emitting diodes (LEDs) based on Langmuir-Blodgett (LB) films. We have used LB deposition technique as a tool to fabricate dc and ac LEDs with a precise thickness ranging from a few molecular layers to tens of layers. In de LEDs, we have shown that as few as three LB layers of active polymer can yield the same luminance as the thicker ones. With the advantage of LB deposition technique to fabricate heterostructure (multilayer) devices, we have used carrier transporting materials and carrier blocking LB films to control and balance the charge injections in dc LEDs. The frequency dependence of (multilayered) ac LEDs has been studied and moderately high-frequency (20 kHz) electroluminescence (EL) intensity has been obtained. From the transient EL measurements, the role of interfaces in polymeric LEDs has been emphasized and the operation mechanism of LED's has been discussed. |
| Databáze: | OpenAIRE |
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