INVESTIGATION OF ELECTROLUMINESCENCE FROM AU NOMETHYLENE-4H-CYCLOPENTA[2,1-B/3,4-B']DITHIOPHENE POROUS SI/SI/AL LIGHT-EMITTING-DIODES/

We report simple porous silicon-based devices producing stable electro luminescence (EL) by the deposition of a oly-4-dicyanomethylene-4H-cyc lopenta[2,1-b:3,4-b'] dithiophene monolayer (PCDM) into the nanostruct ure. The structure of these devices is Au/PCDM/porous silicon/Si/Al. T he EL emission is bright, visible by the naked eye under normal daylig ht, and broad in wavelength, covering the whole visible range with a p eak at 650 nm. The emission area of the devices is 1 cm(2). The EL sta rting voltage is in the range of 14-30 V and the current is around 300 mA. The time stability was good for all the devices tested, After exp osure to the air for more than three months, the devices show nearly t he same emission intensity without increase of external power supplied , (C) 1998 American Institute of Physics.