Eur. Phys. J. Appl. Phys. 41, 29-32 (2008)
https://doi.org/10.1051/epjap:2007174

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

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

Corresponding author: lionel.hirsch@ims-bordeaux.fr

Received: 23 May 2007
Accepted: 15 October 2007
Published online: 19 December 2007

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.