期刊
ACS NANO
卷 4, 期 5, 页码 2673-2680出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn1003315
关键词
light-emitting electrochemical cells (LECs); planar; electroluminescence; photoluminescence; atomic force microscopy (AFM); scanning Kelvin probe microscopy (SKPM); organic electronic devices; electrogenerated chemiluminescence; operation mechanism; electrode; metal work function
类别
资金
- NSF [DMR-0120967, DMR-0449422, CHE0725139]
- DOE
- AFOSR
- Camille Dreyfus Teacher-Scholar Awards
- Cottrell Scholar of the Research Corporation
- Alfred P. Sloan Foundation
- Center for Nanotechnology at the University of Washington [DGE-0504573]
We study the operation of polymer light-emitting electrochemical cells (LECs) by combining scanning Kelvin probe microscopy with in situ imaging of the electroluminescence and photoluminescence on planar LECs. By combining these techniques on the same device in the same apparatus we directly map the relationship between the spatial distribution of electroluminescence and the local potential profile across the device. We find that the electroluminescence is always associated with a region of potential drop in LECs made with poly[2-methoxy-5-(3',7'-dimethyl-octyloxy)-p-phenylenevinylene] (MDMO-PPV), poly(ethylene oxide)(PEO), and potassium trifluoromethanesulfonate. Nevertheless, depending on the electrode metal used, we also find significant potential drops at or near the electrode/organic interfaces. We study the effects of using different electrodes and show that both the electroluminescence and potential profiles are strongly dependent on the electrode work function for thin junctions operated at low potentials. These results indicate injection barriers can affect the operation of LECs even in the presence of doping.
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