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It is typically governed by the active\u2010material composition or the applied voltage. Here, we show that Au nanoparticles (Au\u2010NPs) incorporated at an electrode interface provide an additional control parameter. Using light\u2010emitting electrochemical cells (LECs) as a model system, we demonstrate that Au\u2010NPs at the anodic interface reshape the electrochemically formed p\u2010n junction, which defines the emission zone. Non\u2010capped Au\u2010NPs shift the emission zone away from the anode, whereas citrate\u2010capped Au\u2010NPs shift it toward the anode. By selecting the appropriate Au\u2010NP type, we reposition the emission zone closer to a region of constructive optical interference, leading to a strong increase in LEC emission efficiency. These results establish interfacial Au\u2010NPs as a strategy to modulate the spatial profile of electrochemical doping and tune the performance of organic electronic devices.<\/jats:p>","DOI":"10.1002\/advs.78120","type":"journal-article","created":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T16:12:51Z","timestamp":1791130371000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Modifying Electrochemical Doping in Light\u2010Emitting Electrochemical Cells With Gold Nanoparticles"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5551-7299","authenticated-orcid":false,"given":"Ajay K.","family":"Poonia","sequence":"first","affiliation":[{"name":"Ultrafast Nanoscience Group Department of Physics Ume\u00e5 University  Ume\u00e5 Sweden"},{"name":"The Organic Photonics and Electronics Group Department of Physics Ume\u00e5 University  Ume\u00e5 Sweden"},{"name":"Wallenberg Initiative Materials 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