期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 130, 期 13, 页码 4562-4568出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja7113294
关键词
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We demonstrate that electrochemical side-reactions involving the electrolyte can be a significant and undesired feature in light-emitting electrochemical cells (LECs). By direct optical probing of planar LECs, comprising Au electrodes and an active material mixture of {poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) + poly(ethylene oxide) (PEO) + KCF3SO3}, we show that two direct consequences of such a side-reaction are the appearance of a degradation layerat the negative cathode and the formation of the light-emitting p-n junction in close proximity to the cathode. We further demonstrate that a high initial drive voltage and a high ionic conductivity of the active material strongly alleviate the extent of the side reaction, as evidenced by the formation of a relatively centered p-n junction, and also rationalize our findings in the framework of a general electrochemical model. Finally, we show that the doping concentrations in the doped regions at the time of the p-n junction formation are independent of the applied voltage and relatively balanced at similar to 0.11 dopants/MEH-PPV repeat unit in the p-type region and similar to 0.15 dopants/MEH-PPV repeat unit in the n-type region.
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