Materials for polymer light emitting diodes

Polymer light-emitting diodes have become feasible when suitable materials were available. The various relevant properties are interrelated parameters . The solubility can be improved in various ways but here the introduction of side-chains has been found most successful. Colour tuning is achieved by attaching electron withdrawing or donating side-chains. Some polymer defec ts in PPV are shown. Special functionalities can be built-in. As an example a self-doped PPV is given.