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Blue light-emitting diodes based on novel polyfluorene copolymers
CTH.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics .
Addis Abeba university.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics .
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2007 (English)In: Journal of Luminescence, ISSN 0022-2313, Vol. 122-123, no 1-2, 610-613 p.Article in journal (Refereed) Published
Abstract [en]

This study presents the synthesis and characterisation of a series of fluorene-based conjugated copolymers, together with the preparation and characterisation of the corresponding light-emitting devices. The polymers consist of alkoxyphenyl-substituted fluorene units together with different amounts of a hole-transporting triphenylamine-substituted fluorene unit: 0%, 10%, 25% and 50%. All polymers (P0, P1, P2, and P3) show high photoluminescence efficiency (ηPL) and light emission (both PL and EL) in the blue spectral region. Electrochemical studies show improved hole injection as the ratio of the triphenylamine-substituted segment is increased. The electroluminescence quantum efficiencies (EQEs) of the devices increase six times going from P0 to P1. Compared with P1, polymers P2 and P3 show lower efficiencies in devices. These findings indicate the presence of an optimal polymer composition, where balance between the charge-carrier mobilities has been reached. © 2006 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2007. Vol. 122-123, no 1-2, 610-613 p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-38625DOI: 10.1016/j.jlumin.2006.01.238Local ID: 45034OAI: oai:DiVA.org:liu-38625DiVA: diva2:259474
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2011-01-11

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Zhang, FenglingWang, XiangjunInganäs, Olle

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