Discerning the Impact of a Lithium Salt Additive in Thin-Film Light-Emitting Electrochemical Cells with Electrochemical Impedance Spectroscopy

• DOI: 10.1021/acs.langmuir.6b02415
• Publication Date: 2016-09-06T18:38:34Z
• Authors: Lyndon D. Bastatas; Kuo-Yao Lin; Matthew D. Moore; Kristin J. Suhr; Melanie H. Bowler; Yulong Shen; Bradley J. Holliday; Jason D. Slinker
• Keywords: 02 engineering and technology; 0210 nano-technology; 10. No inequality; 01 natural sciences; 7. Clean energy; 0104 chemical sciences; 3. Good health

Light-emitting electrochemical cells (LEECs) from small molecules, such as iridium complexes, have great potential low-cost emissive devices. In these devices, ions rearrange during operation to facilitate carrier injection, bringing about efficient simple, single-layer Prior work has shown that the luminance, efficiency, and responsiveness of LEECs is greatly enhanced by inclusion fractions lithium salts, but much remains be understood origin this enhancement. Recent with planar devices demonstrates additives in enhance double-layer formation. However, quantitative influence salts on underlying physics conventional thin-film, sandwich structure LEECs, which beneficially operate at low voltages generate higher yet clarified. Here, we use impedance spectroscopy discern impact salt concentration formation within device draw correlations performance metrics, current, external quantum efficiency.