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Near-infrared electroluminescence from conjugated polymer/lanthanide porphyrin blends

Harrison, Benjamin S and Foley, Timothy J and Bouguettaya, Mohamed and Boncella, James M and Reynolds, John R and Schanze, Kirk S and Shim, Joonbo and Holloway, Paul H and Padmanaban, G and Ramakrishnan, S (2001) Near-infrared electroluminescence from conjugated polymer/lanthanide porphyrin blends. In: Applied Physics Letters, 79 (23). pp. 3770-3772.


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Near-infrared-emitting polymer light-emitting diodes (PLEDs) have been fabricated using blends of conjugated polymers and lanthanide tetraphenylporphyrin complexes. Host polymers include MEH–PPV and a bis-alkoxy-substituted poly(p-phenylene) (PPP–OR11), and the lanthanide complexes include Yb(TPP)acac and Er(TPP)acac (where TPP = 5,10,15,20-tetraphenylporphyrin and acac = acetylacetonate). Electroluminescence (EL) is observed at 977 nm from devices fabricated using MEH–PPV or PPP–OR11 blended with Yb(TPP)acac, and EL is observed at 1560 nm from a device fabricated using a blend of MEH–PPV and Er(TPP)acac. 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.

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics (AIP)
Additional Information: The DOI is currently only displayed. Copyright for this article belongs to American Institute of Physics (AIP)
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 07 Jun 2004
Last Modified: 19 Sep 2010 04:12
URI: http://eprints.iisc.ac.in/id/eprint/283

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