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January 2003
Polymer LEDs: Colour coordinated
A new electroluminescent material based on a semiconducting polymer combined with a ruthenium-containing phosphorescent complex boasts a novel property: intrinsic asymmetry in colour emission. A light-emitting diode based on this material switches reversibly between the red emission of the phosphorescent complex and the green emission of the polymer as the applied voltage changes from positive to negative. The procedure for making this switching system is relatively simple, so a new class of novel multicolour devices could be on the way.
Electroluminescent device with reversible switching
between red and green emission
S. WELTER, K. BRUNNER,
J. W. HOFSTRAAT & L. DE COLA
Nature 421, 54–57 (2003);
doi:10.1038/nature01309
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