| Autor: |
Kiyoshi Okamoto, Kazuaki Kaga, J. Sato, Olaf Karthaus, R. Nakamura, Ryota Chiba, T. Imai, Shigeya Kurimura |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
Organic Nanophotonics ISBN: 9781402012808 |
| DOI: |
10.1007/978-94-010-0103-8_23 |
| Popis: |
Many electronics, optoelectronics and photonics devices contain organic compounds as the functional metarial. Photographic films, organic light emitting diodes (OLEDs), solar cells, rewritable compact disks (RW-CDs), or liquid crystal displays are just a few examples of the vast variety of devices that exist. The function of many of these devices depend on the aggregation state of the organic material. Even a simple device such as a photographic film contains cyanine dyes that aggregate onto silver halide microcrystals to form so-called J-aggregates. These J-aggregates show a narrow absorption band and thus are ideal materials for the absorption of a certain wavelength, and thus can be used as photosensitizers in color films [1]. In most OLEDs the emissive and/or conductive compounds have to be in a molecular dispersed state. Aggregation of the molecules would lead to microcrystals that form trap sites for electrons or excited states and thus lead to a decrease in device function, or even to device failure. In the case of LCDs, the orientation of the molecules in the liquid crystalline state can be controlled by an external electric field. The switching between different orientational states then leads to a change in the transmission of light and thus to a visible contrast. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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