Microtech2010 2010

Stable Light Emiting Electrochemical Cells Based in Supramolecular Interactions

R.D. Costa, M. Lenes, E. Ortí, H.J. Bolink, S. Graber, E.C. Constable
University of Valencia, ES

Keywords: optoelectronics, iridium complexes, supramolecular interactions


We will present a breakthrough in the stability of the simplest type of molecular electroluminescent devices, light-emitting electrochemical cells (LEECs). The main drawback of these molecular devices limiting their practical use is their short lifetimes (a few hours). By using an iridium(III) complex conveniently designed to form a supramolecularly-caged structure, we show that the lifetime of LEECs can be increased to more than 3000 hours at an average luminance of 200 cd/m2 while operating at a bias of only 3 volts. This large increase in lifetime is obtained without sacrificing the device turn-on time of a few seconds. This result is sufficient for low-cost lighting applications of LEECs.
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