Conjugated block copolymers for light-emitting diodes

摘要

In this communication we report results obtained in our laboratory on the design, the synthesis, and the characterization of new light-emitting copolymers. We are interested in block copolymers containing well defined conjugated sequences, which give rise to luminescence. Those chromophores, which are $pi@-conjugated oligomers like oligo(phenylenevinylene)s, are linked to each other by non $pi@-conjugated oligomers, for example oligo(silanylene)s, or directly in a non-coplanar way. In such systems color tuning of the luminescence is achieved through precise control of the length of the conjugated blocks and by changing the chemical structure of those blocks. Variations of the chemical structures of both the luminescent and interrupting blocks also give control over properties like flexibility and solubility of the polymers, which are relevant for device fabrication and optimization.