Abstract
Effects of the electronic structure of polymer/polymer interfaces on the electroluminescence efficiency and tunable multicolor emission of polymer heterojunction light-emitting diodes were explored by a series of 16 n-type conjugated polymers with varying electron affinities and ionization potentials in conjunction with poly(p-phenylenevinylene). Efficiency and luminance of diodes of the type indium−tin oxide/poly(p-phenylenevinylene)/n-type polymer/aluminum were maximized and were as high as 3% photons/electron and 820 cd/m2, respectively, when the energetics at the polymer/polymer interface favored electron transfer while disfavoring hole transfer. Energetic barrier to electron transfer at the polymer/polymer interface was more important to electroluminescence efficiency and diode luminance than injection barrier at the cathode/polymer interface. By a judicious choice of the relative layer thicknesses and the components of the bilayer heterojunctions, the rate of both electron and hole transfer across t...
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