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Green light from polymers
10 March 2006
Electroluminescent polymers with the potential for displaying the full spectrum of colour have been developed using a dopant/host strategy by Chinese chemists.
Lixiang Wang and colleagues at the Changchun Institute of Applied Chemistry have introduced a new method for making green polymer light emitting diode (PLED) materials. They grafted small amounts of a green fluorescent dye onto the blue-emitting main chain of polyfluorene to create a green light PLED.
This latest dopant/host strategy is different from the common approach, in which a large amount of a light emitter is added to the main chain of a polymer, said Wang.
Energy is transferred from the polymer to the green fluorescent dye and light is only emitted from the dye. By chemically modifying the dye and the host polymer, polymers that emit light in the range 400-800 nm can be made. This means that they can give off any colour in the visible spectrum.
These electroluminescent polymers open up many new display product possibilities, such as displays on portable electronic devices, said Wang.
J Liu, G Tu, Q Zhou, Y Cheng, Y Geng, L Wang, D Ma, X Jing and F Wang, J. Mater. Chem., 2006 (DOI: 10.1039/ b514359d)