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Phys Rev Lett. 2002 Oct 14;89(16):167401. Epub 2002 Sep 26.

Intrinsic room-temperature electrophosphorescence from a pi-conjugated polymer.

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  • 1Max Planck Institute for Polymer Research, Ackermann-Weg 10, D-55128 Mainz, Germany.


Electrically induced phosphorescence from a poly(para-phenylene) ladder-type polymer is observed for the first time and characterized using time resolved spectroscopy. Short-lived phosphorescence is also observed in gated fluorescence spectra and is found to be quenched reversibly by oxygen. Thermally activated triplet diffusion to covalently bound palladium sites, which are formed at a concentration of about 80 ppm in a side reaction during polymer synthesis, is believed to be the cause of this novel effect, which suggests a new approach to the design of efficient electroluminescent materials.

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