Electroluminescence from oligothiophene-based light-emitting devices


  • Presented at the first “Symposium on Polymer Light-Emitting Diodes”, 15–17.9.1993, Eindhoven, The Netherlands. We would like to thank P. Emele and H. Port for absorption and PL measurements, and P. Emele, H. Port, H.-J. Egelhaaf, D. Oelkrug, and M. Sokolowski for valuable discussions. This work was financially supported by the Bundesministerium für Forschung and Technologie (projects TK 0325 and 05BM250/2). One of us (E. U.) gratefully acknowledges support by the Fond der Chemischen Industrie.


The first LEDs based on oligothiophenes are reported. Polymer-based devices have the advantages that their physical properties can be tailored, they can be easily fabricated, and they can emit all colors, but they have poor stability, a high impurity level, and low luminance. The systematic study of the electroluminescence properties of oligothiophenes described here is aimed to isolate the effects of various parameters, by controlling the structure of the oligomers used, and to extrapolate the results to polymers for use in LEDs.