FLUORENE DIMERS AND TRIMERS AND OPTOELECTRONIC DEVICES USING THE SAME

Solution processes for fabricating an optoelectronic devices include contacting an electroluminescent layer comprising an alcohol-insoluble electroluminescent polymer with an alcoholic solution of a compound of formula Ia to form an electron transporting layer directly disposed on the electroluminescent layer; and depositing a metal cathode layer on the electron transporting layer; wherein R1 is, independently at each occurrence, C1-20 hydrocarbyl; at least one of R1 is R3; R2 is independently at each occurrence hydrogen, C1-20 hydrocarbyl, C1-20 hydrocarbyloxy, C1-20 thioether, C1-20 hydrocarbylcarbonyloxy or cyano; R3 is C1-20 hydrocarbyl containing at least one S, N, O or P atom between carbon atoms; a is independently at each occurrence 0, 1 or 2; and n is 0 or 1.