Near-infrared-emitting polymer light-emitting diodes ͑PLEDs͒ have been fabricated using blends of conjugated polymers and lanthanide tetraphenylporphyrin complexes. Host polymers include MEH-PPV and a bis-alkoxy-substituted poly͑p-phenylene͒ ͑PPP-OR11͒, and the lanthanide complexes include Yb͑TPP͒acac and Er͑TPP͒acac ͑where TPPϭ5,10,15,20-tetraphenylporphyrin and acacϭacetylacetonate͒. Electroluminescence ͑EL͒ is observed at 977 nm from devices fabricated using MEH-PPV or PPP-OR11 blended with Yb͑TPP͒acac, and EL is observed at 1560 nm from a device fabricated using a blend of MEH-PPV and Er͑TPP͒acac. Visible EL from the host polymers is strongly suppressed in all of the devices, however, in the device fabricated using the PPP-OR11 polymer blue emission from the host is completely quenched. Very efficient quenching of the EL from the host in the PPP-OR11 device is believed to occur due to efficient Förster energy transfer, which is facilitated by the excellent spectral overlap between the PPP-OR11 fluorescence and the Soret absorption band of the TPP ligand.
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