© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
March 21, 2011
Functional Polymers: New blue light emitting polymers for polymer LEDs
H.-M. Shih, C.-J. Lin, S.-R. Tseng, C.-H. Lin, C.-S. Hsu*
Polymer light emitting diodes (PLED) are attracting great interest because of their potential applications in full-color flat panel displays and in solid-state lighting. Of the three elemental colors, the materials for blue light emission remain problematic. Polyfluorenes (PFs) show promise as blue light emitting polymers due to their high photoluminescence (PL) quantum efficiency, and good thermal and chemical stability. However, PFs exhibit poor electroluminescence and color stability, due to their intermolecular aggregation of the polymer backbones, and the keto effect. As it is known that device performance improvements are possible by the incorporation of dopants in the polymer chains, in this study new anthracene-based blue-light-emitting polymers, where the dopants are covalently bonded to the polymer chain, are synthesized via a palladium-catalyzed Suzuki Polymerization.
They have a high photoluminescence quantum yield as well as good electrochemical properties, resulting in stable color and enhanced device performance. The double-layer and multilayer devices fabricated exhibit good performance. These results are recently published as part of the ongoing series on Functional Polymers - Luminogenic Polymers in Macromolecular Chemistry and Physics.
Macromol. Chem. Phys., DOI: 10.1002/macp.201000680
Other contributions to the special series on functional polymers can be found here.