Polymer bulk homojunction light-emitting electrochemical cells

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作者
Tracy, Corey [1 ]
Gao, Jun [1 ]
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[1] Department of Physics, Queen's University, Kingston, Ont., Canada
来源
Journal of Applied Physics | 2006年 / 100卷 / 10期
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We report polymer light-emitting electrochemical cells (LECs) based on the in situ formation of thousands of micrometer-sized light-emitting p-n junctions within the bulk of the device. These bulk homojunction LECs; achieved by mixing metallic particles into the LEC film; exhibit dramatically improved electroluminescence (EL) output and response time. This is confirmed by EL intensity and absolute luminance measurements; which reveals an increase in quantum efficiency of more than tenfold; relative to a conventional single junction LEC of similar dimensions. The high performance of a bulk homojunction is attributed to its large specific emitting area. Further; we demonstrate red-; green-; and blue-emitting bulk homojunction LECs by using various combinations of luminescent polymers and metallic particles. © 2006 American Institute of Physics;
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