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Increased efficiency of light-emitting diodes incorporating anodes functionalized with fluorinated azobenzene monolayers and a green-emitting polyfluorene derivative

Lazzerini, G. M. and Mian, S. and Di Stasio, F. and Merari Masillamani, A. and Crivillers, N. and Reinders, F. and Mayor, M. and Samori, P. and Cacialli, F.. (2012) Increased efficiency of light-emitting diodes incorporating anodes functionalized with fluorinated azobenzene monolayers and a green-emitting polyfluorene derivative. Applied physics letters, Vol. 101, H. 15 , 153306.

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Official URL: http://edoc.unibas.ch/dok/A6083381

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Abstract

We investigate the functionalization of gold anodes with azobenzene-based self-assembled monolayers (AZO-SAM) and the influence of such functionalization on the external quantum efficiency (EQE) of polyfluorene-based light-emitting diodes (LEDs). Photoluminescence and electroluminescence measurements show that the AZO-SAMs do not modify the shape of the emission spectrum of the active layer. Instead, AZO-SAMs enhance the EQE of LEDs by an order of magnitude (from 0.018% to 0.18%) and decrease the turn-on voltage from 7.9 V to 6.2 V by reducing the injection barrier at the anode, thus promoting a better balance between hole and electron populations in the active layer.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Molecular Devices and Materials (Mayor)
UniBasel Contributors:Mayor, Marcel and Reinders, Federica
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Institute of Physics
ISSN:0003-6951
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:24 May 2013 09:22
Deposited On:24 May 2013 09:02

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