Organic semiconductor-based light

Organic Semiconductor-Based Light Soiu ces and Detectors... 

Fig. 4.9. Schematic of device structure of typical organic semiconductor-based light sources and detectors...

To this end we have developed an organic semiconductor based fluorescence demonstrator for point-of-care diagnostic testing (Fig. 4.29). The fluorescence demonstrator comprises an OLED-based light source in the lid, which is... 

Semiconductors are materials that are characterized by resistivities iatermediate between those of metals and of iasulators. The study of organic semiconductors has grown from research on conductivity mechanisms and stmcture—property relationships ia soHds to iaclude appHcations-based research on working semiconductor junction devices. Organic materials are now used ia transistors, photochromic devices, and commercially viable light-emitting diodes, and the utility of organic semiconductors continues to iacrease. 

One idea was that conduction should be looked for in materials based on organic unsaturated molecules, where electrons and holes are more easily excited into delocalised states. Little proposed that, in these materials, carriers created by such excitonic excitations could couple into electrons and holes plasmons, as later indeed observed in classical semiconductors under light, and thus produce a conductive state hopefully a superconductor state could develop under the same electron-electron interactions, leading possibly to high T<. s. The search for such excitonic conduction had been initiated shortly before as a porposal by W. Kohn for normal covalent semiconductors it had been carried out notably by D. Jerome, when he came to Orsay after on year s stay with Kohn in La Jolla various mineral semiconductors were studied, with small gaps and often low dimensionally. 

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