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Increasing the efficiency of light-emitting electrochemical cells by limiting the exciton quenching

Published online by Cambridge University Press:  20 May 2013

Daniel Tordera ,
Antonio Pertegás ,
Enrique Ortí  and
Henk J. Bolink
Daniel Tordera
Affiliation:
Instituto de Ciencia Molecular, Universidad de Valencia C/ Catedrático J. Beltrán 2 ES-46980 Paterna (Valencia), Spain.
Antonio Pertegás
Affiliation:
Instituto de Ciencia Molecular, Universidad de Valencia C/ Catedrático J. Beltrán 2 ES-46980 Paterna (Valencia), Spain.
Enrique Ortí
Affiliation:
Instituto de Ciencia Molecular, Universidad de Valencia C/ Catedrático J. Beltrán 2 ES-46980 Paterna (Valencia), Spain.
Henk J. Bolink*
Affiliation:
Instituto de Ciencia Molecular, Universidad de Valencia C/ Catedrático J. Beltrán 2 ES-46980 Paterna (Valencia), Spain.
*
*Email: henk.bolink@uv.es
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Abstract

Light-emitting electrochemical cells (LECs) are one of the simplest electroluminescent devices. The possibility to be processed from solution and to operate with air-stable materials makes them an attractive alternative to organic light emitting diodes (OLEDs). Still their efficiencies are below those obtained in OLEDs. Additionally the best efficiencies were reported at low luminances and sustained for a short period of time. Here we show that for a LEC employing an orange-emitting charged iridium complex that is driven using a pulsed driving scheme high efficiencies of up to 20.5 cd A-1 can be obtained at high luminance and sustained over the device lifetime. It is also shown that the efficiency depends strongly on the current density applied.

Keywords

organometallicoptical propertiesluminescence
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1567: Symposium JJ – Fundamental Processes in Organic Electronics , 2013 , mrss13-1567-jj13-38
Copyright
Copyright © Materials Research Society 2013 

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References

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