White light from an electroluminescent diode made from poly[3(4-octylphenyl)-2,2'-bithiophene] and an oxadiazole derivative - Berggren, M.; Gustafsson, G.; Inganäs, O.; Andersson, M. R.; Hjertberg, T.; Wennerström, O. (American Institute of Physics (AIP), 1994)
http://dx.doi.org/10.1063/1.357984
Keywords: U