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A step by step strategy for solution-processed quantum dotslight emitting diodes

Published online by Cambridge University Press:  08 March 2011

Hélène Bourvon ,
Stéphanie Le Calvez ,
David Vaufrey  and
Sylvia Meunier Della Gatta
Hélène Bourvon
Affiliation:
CEA-LETI, MINATEC Campus, DIHS/LTCV, 17 rue des Martyrs, 38054 Grenoble Cedex 9 France
Stéphanie Le Calvez
Affiliation:
CEA-LETI, MINATEC Campus, DIHS/LTCV, 17 rue des Martyrs, 38054 Grenoble Cedex 9 France
David Vaufrey
Affiliation:
CEA-LETI, MINATEC Campus, DIHS/LTCV, 17 rue des Martyrs, 38054 Grenoble Cedex 9 France
Sylvia Meunier Della Gatta
Affiliation:
CEA-LETI, MINATEC Campus, DIHS/LTCV, 17 rue des Martyrs, 38054 Grenoble Cedex 9 France
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Abstract

Solution-based printing and coating processes have the potential todramatically reduce the production costs of Organic Light Emitting Diodes.This is particularly true for Quantum Dots Light Emitting Diode (QDLEDs),the newborn in the field of LEDs, due to quantum dots price prohibitingwastage. Here, we report our latest results on the development ofsolutionprocessed QDLEDs. We have implemented a layer by layer strategy,from a whole evaporated small molecule based OLED to a hybrid QDLEDdeveloped by wet deposition techniques for the first layers and byevaporation for the last ones. Intermediate steps are discussed in thispaper.

First, we have worked on a poly(3,4-ethylenedioxythiophenepoly(styrenesulfonate) (PEDOT:PSS) layer. The PEDOT:PSS formulation forinkjet printing and spin coating were optimised: wettability on an ITOsubstrate, jettability of the inkjet formulation and baking conditions werestudied. Additives as surfactant and ethylene glycol were added to thecommercial inkjet grade solution to improve the deposition process. As aconsequence to this study, anisotropic conductivity of PEDOT:PSS wasobserved and is reported here. In particular, ethylene glycol demonstrated astrong ability to increase the parallel conductivity by several orders ofmagnitude, but not the vertical one.

Then, inkjet-printed and spin-coated device performances are compared tocomplete this first study. Hybrid devices with an efficacy of 12cd/A at 4Vwere obtained, with 2.17 % of EQE, and a luminance of 4000 cd/m2at 4V.

Finally, we succeeded in the development of our first QDLED based on CdSecore/ CdSZnS shell quantum dots emitting at a wavelength of 600nm. Quantumdots were inkjet printed, in order to waste as little as possible this veryexpensive material.

Keywords

ink-jet printingpolymersolution deposition

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e03-03
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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