Derivatives of newly synthesized aromatic polyimides containing sulphur atoms in the backbone were studied as electron–hole-transporting and light-emitting materials for use in combination with tris(8-hydroxyquinoline)-aluminium in multilayer organic electroluminescent devices. Efficient bipolar charge transport has been revealed in the polymers. Bright electroluminescence (15000cdm-2 at 14V) was observed in the visible range. The possible role of intermolecular donor–acceptor interactions in the mechanism of electroluminescence is discussed.
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Mal’tsev et al. (1997) studied this question.