Copolymers with functionalized side chains

#This application is a national stage application (under 35 U.S.C. §371) of PCT/EP2012/002714, filed Jun. 28, 2012, which claims benefit of European application 11006098.5, filed Jul. 25, 2011.

#The invention relates to an electroluminescent copolymer, an emulsion, a dispersion, and a solution comprising said copolymer, a method for the preparation of a film using the solution and/or the dispersion and/or the emulsion as well as a use of said copolymers in electronic devices, and electronic devices comprising the said copolymers.

#Organic light emitting diodes (OLEDs) based on organic polymer materials, also known as polymer light emitting diodes (PLEDs), have drawn much attention due to their potential application in next generation panel displays.

#FIG. 1: I-V (current-voltage) diagram as measured with cyclic voltammetry (CV) for polymer IL1.

#FIG. 2: I-V diagram as measured with CV for copolymer 1.

#FIG. 3: I-V diagram as measured with CV for copolymer 2.

#Further advantages or advantageous refinements of the invention will become apparent from the dependent claims and the following description.

#In a first embodiment, the present invention relates to an electroluminescent copolymer. The electroluminescent copolymer comprises at least one hole transport unit on one or more side-chain(s) of the copolymer, at least one electron transport unit, and at least one unit A, wherein the HOMO of both the hole transport unit and the unit A are at least 0.3 eV higher than the HOMO of the electron transport unit. Moreover the electroluminescent copolymer may comprise at least one emitter.

#In a preferred embodiment the HOMO of the hole transport unit is lower than that of the unit A, at least lower than 0.1 eV, preferably lower than 0.2 eV, and particularly preferably lower than 0.3 eV