MISC

査読有り
2017年5月

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

ADVANCED MATERIALS
  • Tomo Sakanoue
  • ,
  • Jinpeng Li
  • ,
  • Hisaaki Tanaka
  • ,
  • Ryota Ito
  • ,
  • Shimpei Ono
  • ,
  • Shin-ichi Kuroda
  • ,
  • Taishi Takenobu

29
18
開始ページ
1606392-1-7.
終了ページ
記述言語
英語
掲載種別
速報,短報,研究ノート等(学術雑誌)
DOI
10.1002/adma.201606392
出版者・発行元
WILEY-V C H VERLAG GMBH

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(-2) with a balanced electron/ hole ratio, at a high-speed response time of approximate to 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 x 10(19) spins cm(-3), and an ordered polymer structure in the active layer blend.

Web of Science ® 被引用回数 : 21

リンク情報
DOI
https://doi.org/10.1002/adma.201606392
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000400636400017&DestApp=WOS_CPL