A high efficiency blue-light-emitting diode based on novel ladder poly(p-phenylene)s


  • We thank S. C. Moratti for assistance in the provision of PPV, and H. Schenk and O. Gelsen for helpful discussions. We thank the Européan Commission for support for this work under the Human Capital and Mobility programme “Chemical Physics at Cambridge”, and under the BRITE-EURAM contract “POLYLED”, BRE2-CT93-0592.


Low energy losses due to non-radiative decay are an important step towards high-efficiency organic LEDs. The rigid, regioregular structure of the novel ladder poly(p-phenylene)s reported here lead to a reduction in such losses and to potentially interesting internal LED efficiencies of 1%. The effect on the efficiency of varying the length of the spacers in the structure is examined.