TITLE

Near-infrared electroluminescence of polymer light-emitting diodes doped with a lissamine-sensitized Nd[sup 3+] complex

AUTHOR(S)

Slooff, L. H.; Polman, A.; Cacialli, F.; Friend, R. H.; Hebbink, G. A.; van Veggel, F. C. J. M.; Reinhoudt, D. N.

PUB. DATE

April 2001

SOURCE

Applied Physics Letters;04/09/2001, Vol. 78 Issue 15, p2122

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

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 Nd[sup 3+] 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 Nd[sup 3+] 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.

ACCESSION #

4710543

Tags: LIGHT emitting diodes;  ELECTROLUMINESCENCE

 

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