Lessard Research Group - Next Generation Materials for Next Generation Applications

First BsubPc Polymer OLED!

In this study, we set out the steps to efficiently synthesize boron subphthalocyanine (BsubPc)-containing polymers while circumventing the formation of a known side product. The synthesis was achieved using the post-polymerization coupling reaction of a carboxylic acid functional prepolymer with bromo-BsubPc. We have earlier shown that when copolymerizing styrene and acrylic acid (AA) a significant amount of an undesired side product is formed. In this study, we have determined that this side product persisted when styrene was copolymerized with AA or n-butyl acrylate but could be avoided when styrene was copolymerized with methacrylic acid (MAA), methyl methacrylate, or acrylonitrile. Therefore, MAA/styrene copolymer, synthesized by nitroxide-mediated polymerization was chosen to be coupled to BsubPc. The resulting BsubPc polymer was found to have similar electrochemical properties, solution state absorption and photoluminescence characteristics when compared against a small molecule model compound although the solid-state PL emission of the polymer was found to be excitation wavelength dependent. Finally, preliminary organic light-emitting diodes (OLEDs) were fabricated to assess the potential role(s) of the BsubPc polymer in organic electronic devices. These OLEDs represent the first-solution processed organic electronic devices containing BsubPc polymers as a functional material.


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