High Current Injection into Dynamic p–n Homojunction in Polymer Light‐Emitting Electrochemical Cells

DOI Web Site Web Site 被引用文献12件 参考文献36件
  • Tomo Sakanoue
    Department of Applied Physics Nagoya University Chikusa Nagoya 464‐8603 Japan
  • Jinpeng Li
    Department of Applied Physics Waseda University Tokyo 169‐8555 Japan
  • Hisaaki Tanaka
    Department of Applied Physics Nagoya University Chikusa Nagoya 464‐8603 Japan
  • Ryota Ito
    Department of Applied Physics Waseda University Tokyo 169‐8555 Japan
  • Shimpei Ono
    Central Research Institute of Electric Power Industries (CRIEPI) 2‐6‐1, Nagasaka Yokosuka 240‐0196 Japan
  • Shin‐ichi Kuroda
    Department of Applied Physics Nagoya University Chikusa Nagoya 464‐8603 Japan
  • Taishi Takenobu
    Department of Applied Physics Nagoya University Chikusa Nagoya 464‐8603 Japan

説明

<jats:p>Ions and electrons in blends of polymer–electrolyte can work in ensemble to operate light‐emitting electrochemical cells (LECs), in which the unique features of in situ formed p–n homojunctions offer efficient charge injection and transport. However, electrochemical features give rise to significant stability and speed issues due to limited electrochemical stability and low ion mobility, resulting in low brightness and a slow response of LECs. Here, these issues are overcome by the separate control of ionic and electronic charges, using a simple driving pulse superimposed on a small base voltage; ions with slow response are rearranged by a constant base voltage, while a high‐voltage pulse, superimposed upon the base, injects electrons/holes which have fast response, with minimal effect on the ions. This scheme successfully injects an extremely high current density of > 2 kA cm<jats:sup>−2</jats:sup> with a balanced electron/hole ratio, at a high‐speed response time of ≈ 50 ns; both properties demonstrate advantages of LECs in making polymers brighter. An in situ electron spin resonance measurement on the LECs further revealed that this impressive performance is due to the highly doped polymers, whose spin density reached 7 × 10<jats:sup>19</jats:sup> spins cm<jats:sup>−3</jats:sup>, and an ordered polymer structure in the active layer blend.</jats:p>

収録刊行物

被引用文献 (12)*注記

もっと見る

参考文献 (36)*注記

もっと見る

関連プロジェクト

もっと見る

問題の指摘

ページトップへ