Electoluminescent devices based on polythiophene‐system this films have been demonstrated that together span the entire visible range, steric hindrance being used to vary the bandgap between compunds. Poly‐(3‐cyclohexylthiophene), see Figures, exhibits green electoluminescence. Possible interpretations of this observation are proposed.
Berggren, M., Gustafsson, G., Inganas, O., Andersson, M. R., Wennerström, O., & Hjertberg, T. (1994). Green Electroluminescence in Poly(3-cyclohexylthiophene) Light-Emitting Diodes. Advanced Materials, 6(6), 488-490. https://doi.org/10.1002/adma.19940060611