Near-infrared electroluminescence of polymer light-emitting diodes doped with a lissamine-sensitized Nd3+ complex

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Slooff, L.H. and Polman, A. and Cacialli, F. and Friend, R.H. and Hebbink, G.A. and Veggel van, F.C.J.M. and Reinhoudt, D.N. (2001) Near-infrared electroluminescence of polymer light-emitting diodes doped with a lissamine-sensitized Nd3+ complex. Applied Physics Letters, 78 (15). pp. 2122-2124. ISSN 0003-6951

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Abstract:We report 890 nm luminescence from a neodymium-doped polymer light-emitting diode. The active layer is a blend of poly(dioctylfluorene-co-benzothiadiazole), F8BT, and a lissamine-functionalized terphenyl-based neodymium complex. We detect electroluminescence from both the lissamine (580 nm) and the Nd3 + complex (890 nm). By comparison with lissamine-free devices we show that the lissamine is crucial to infrared emission. The neodymium/lissamine luminescence intensity ratio is higher under electrical excitation than under optical excitation, showing that more triplets reach Nd3 + under electrical excitation. High turn-on voltages provide a clear indication for charge trapping onto the lissamine, and we consider direct triplet formation on the lissamine to be competing efficiently with respect to slower Dexter-type triplet transfer from the F8BT to the lissamine.
Item Type:Article
Copyright:© 2001 American Institute of Physics
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Link to this item:http://purl.utwente.nl/publications/36568
Official URL:http://dx.doi.org/10.1063/1.1359782
Publisher URL:http://link.aip.org/link/?APPLAB/78/2122/1
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