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Study of polymer-electrode interfaces in polymer light-emitting diodes using electrical impedance spectroscopy

Published online by Cambridge University Press:  11 February 2011

A. van Dijken ,
I.N. Hulea ,
H.B. Brom  and
K. Brunner
A. van Dijken
Affiliation:
Philips Research Laboratories, Eindhoven, The Netherlands
I.N. Hulea
Affiliation:
Kamerlingh Onnes Laboratory, Leiden University, Leiden, The Netherlands
H.B. Brom
Affiliation:
Kamerlingh Onnes Laboratory, Leiden University, Leiden, The Netherlands
K. Brunner
Affiliation:
Philips Research Laboratories, Eindhoven, The Netherlands
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Abstract

Electrical impedance spectroscopy is used to show that time-dependent charge trapping processes occur in double-layer polymer light-emitting diodes based on poly(ethylene-dioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS) and poly(p-phenylene vinylene) (PPV). No time-dependent charge trapping processes are observed in single-layer devices based on PPV only. Furthermore, in double-layer devices based on poly(2,7-spirofluorene) (PSF) instead of PPV, such processes are also absent. Traps are probably created in the PPV layer close to the PEDOT:PSS interface due to chemical reactions that occur specifically between PEDOT:PSS and PPV.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 734: Symposia A/B – Defect-Mediated Phenomena in Ordered Polymers – Polymer/Metal Interfaces and Defect Mediated Phenomena in Ordered Polymers , 2002 , B6.2
Copyright
Copyright © Materials Research Society 2003

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