Long-Lifetime Polymer Light-Emitting Electrochemical Cells


  • This research was supported by a UC Discovery grant as part of the Mistsubushi Chemicals Center for Advanced Materials (MC-CAM) at UC Santa Barbara. We thank Dr. Daniel Moses and Nelson Coates for help in obtaining the response time of the frozen junction devices. We also thank James Swensen and Jonathan D. Yuen for technical help and discussion.


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Polymer light-emitting electrochemical cells with long operating lifetimes (see figure) are reported. The ions inside the luminescent semiconducting polymer are spatially redistributed by applying a voltage at a temperature above the melting point of the ionic liquid. These ionic-liquid-based light-emitting electrochemical cells also exhibit excellent current-rectification diode properties, a single-phase active layer, and short response times.