Rectifying electroluminescence

The application of Langmuir-Blodgett films as rectifiers and/or switches have been also proposed. Peterson [106] investigated two semiconductors polyparaphenylene 178 and polyphenylenevinylene 179 with these purposes in mind. These systems with the chain lengths of at least 20 units could also be used as photovoltaic devices since their electroluminescence should be readily detectable. The doping of such materials may be necessary but at present it is not clear whether they will form Langmuir-Blodgett films when doped. 

ZnO LED Au/p(i)-ZnO/n-ZnO single crystal/In structure grown by N2O plasma enhanced PLD, rectifying behavior, bluish-white electroluminescence [102]... 

Electroluminescence—luminous discharge of high frequency brought about by photon emissions. Rectifier— A device that converts alternating current (AC) to direct current (DC). 

As for a6T, Mg led to superior rectifying behaviour for ECnT thin films, whereas the electroluminescence yields are not enhanced for lower workfunction electrodes [313], The latter unexpected effect could be due to different indiflusion of the metals or chemical reactions at the interface, as discussed in Section 6.1. From asymmetric cells comprising two different ECnTs it can be concluded that electroluminescence always takes place in the layer at the electron-injecting electrode. Thus the hole-injection and transport seems to be more efficient if compared with the electron transfer. The majority charge carriers are therefore holes injected at the ITO electrode. 

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