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Multilayer fluorescent polymer light emitting diode with low voltage and high efficiency

Published online by Cambridge University Press:  19 December 2007

M. Ben Khalifa ,
G. Wantz ,
J. P. Parneix  and
L. Hirsch
M. Ben Khalifa
Affiliation:
Université de Bordeaux, CNRS, Laboratoire IMS-UMR 5218, École Nationale Supérieure de Chimie et de Physique de Bordeaux, 16 Av. Pey Berland, 33607 Pessac Cedex, France
G. Wantz
Affiliation:
Université de Bordeaux, CNRS, Laboratoire IMS-UMR 5218, École Nationale Supérieure de Chimie et de Physique de Bordeaux, 16 Av. Pey Berland, 33607 Pessac Cedex, France
J. P. Parneix
Affiliation:
Université de Bordeaux, CNRS, Laboratoire IMS-UMR 5218, École Nationale Supérieure de Chimie et de Physique de Bordeaux, 16 Av. Pey Berland, 33607 Pessac Cedex, France
L. Hirsch*
Affiliation:
Université de Bordeaux, CNRS, Laboratoire IMS-UMR 5218, École Nationale Supérieure de Chimie et de Physique de Bordeaux, 16 Av. Pey Berland, 33607 Pessac Cedex, France
*
[email protected]
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Abstract

This study reports highly efficient green multilayer polymer light-emitting diodes (PLEDs). The fluorescent polymer is poly[(9,9-dioctyl-2,7-divinylene-fluorenylene)-alt-co-{2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene}] end capped with dimethylphenyl (ADS108GE). This emissive polymer has been found to behave as an electron transport emitter. A poly(N-vinylcarbazole) (PVK) layer has been introduced as both hole transporting layer/electron blocking layer. Thicknesses of both ADS108GE and PVK layers have been optimized. 3.1 lm/W have been achieved which corresponds to an improvement by a factor 2 comparing to devices without PVK. Luminances as high as 25 000 Cd/m2 at low operating voltage are reported.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 41 , Issue 1 , January 2008 , pp. 29 - 32
Copyright
© EDP Sciences, 2007

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