Research Highlights: White Light-Emitting Electrochemical Cell

Aug 29, 2011 Joint efforts of the research team from Umea University, Sweden and Merck KGaA, Germany has resulted in the development of a novel light-emitting electrochemical cell (LEC) that has  air-stable electrodes and a solution-processed single-layer active material that emits warm-white light (CIE coordinates = (0.39, 0.43); color rendering index =83) with significant brightness (B) at a low voltage.

It is reported in this article, published in the ASAP section of ACS Applied Materials & Interfaces, that the carefully tuned trichromatic device exhibits a short turn-on time (5 s to B > 100 cd/m2), high efficiency (3.1 cd/A at B = 240 cd/m2) and good operational stability (17 h at B > 100 cd/m2). The researchers also describe fabrication of a blue LEC with a highly respectable set of device properties in the form of a turn-on time of 5 s, an efficiency of 3.6 lm/W and 5.6 cd/A, and an uninterrupted operational lifetime of 25 h.

It is noted that a path for future performance improvement of white LEC have been devised based on the analysis of data from trichromatic and monochromatic devices as well as from the constituent fluorescent CPs.

To read the article from AVS publications website please refer to:

Author:  Alice Jones

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