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Proceedings Paper

Triazole-containing copolymer for use as an electron transport material in multilayer LEDs
Author(s): Alan W. Grice; Ali R. Tajbakhsh; Paul L. Burn; Donal D. C. Bradley
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Paper Abstract

We report investigations into a poly(1,20-distyrylbenzene- co-1,2-[4-(p-ethylphenyl)]triazole) (TRIDSB) electron transport material and its incorporation into single and multilayer LEDs. Multilayer devices have been investigated with poly(p-phenylenevinylene) (PPV) and poly(2-methoxy-5- (2'-ethylhexyloxy)-1,4-phenylenevinylene) as hole transport layers (HTLs). The incorporation of the polymer into an ITO/PPV/TRIDSB/Al LED facilitates electron injection into the hole transporting emissive layer and results in a ten fold increase in the external quantum efficiency for electroluminescence (EL) of the PPV layer from 0.008 percent to 0.08-0.1 percent. In an ITO/I-MEHPPV/TRIDSB/Al device the corresponding increase in the quantum efficiency for EL from the 1-MEHPPV is fifty fold, from 0.002 percent to between 0.06-0.11 percent. The polymer has been shown to be thermally stable with no glass transition temperature or melting point detected within the range 25-250 degrees C.

Paper Details

Date Published: 1 December 1997
PDF: 7 pages
Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.279327
Show Author Affiliations
Alan W. Grice, Univ. of Sheffield (United Kingdom)
Ali R. Tajbakhsh, Univ. of Sheffield (United Kingdom)
Paul L. Burn, Oxford Univ. (United Kingdom)
Donal D. C. Bradley, Univ. of Sheffield (United Kingdom)


Published in SPIE Proceedings Vol. 3148:
Organic Light-Emitting Materials and Devices
Zakya H. Kafafi, Editor(s)

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