We have constructed electroluminescent diodes using several layers of conjugated polymers with differing band gaps; these provide a range of different colour tight-emitting layers and can be used to control charge injection and transport. Poly(1,4-phenylenevinylene, PPV, and derivatives have been used, with indium/tin oxide as hole-injecting layer and calcium as electron-injecting contact layer. For this selection of materials, we show that the ordering of the polymer layers allows control of the colour of device emission. Emission can be produced in more than one layer.
|Number of pages||9|
|Journal||Chemical Physics Letters|
|Publication status||Published - 27 Nov 1992|