Two-layer light-emitting diodes based on sexithiophene and derivatives


  • We thank Dr. Michel Schott for very fruitful discussions. The work was supported by the French Ministry of Research.


The performance of oligothiophene-based organic LEDs can be dramatically improved (by up to four orders of magnitude) by using a two-layer device made of unsubstituted sexithiophene (6T) and a substituted 6T (see Fig.), although the substituted 6T materials do not produce electroluminescence in single-layer devices. Yellow emission with a quantum yield of 0.15% has been achieved.

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