Antagonistic responses between magnetoconductance and magnetoelectroluminescence in polymer light-emitting diodes

Kai Wei Tsai, Tsung Hsun Lee, Jin Han Wu, Jing Yuan Jhou, Wei Shun Huang, Sung Nien Hsieh, Ten Chin Wen, Tzung Fang Guo, J. C.A. Huang

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

Antagonistic responses between magnetoconductance (MC) and magnetoelectroluminescence (MEL) in the polymer light-emitting diodes with an interfacial layer between Al cathode and active layer are simultaneously measured. As the interfacial layer (tetraoctylammonium bromide) is used, the significant increase in the number of injected negative polarons and the blocking of positive polarons promote the triplets-(free polaron) reaction and provide a good explanation for the reason that electroluminescence (EL) efficiency is maximal in the trap free space charge limited current regime at high bias. By fitting of MC and MEL curves using Lorentzian and non-Lorentzian empirical equations, three magnetic field dependent mechanisms, which are the intersystem crossing between singlet/triplet polaron pairs, the triplets-(free polaron) reaction, and the triplets-(trapped polaron) reaction are elucidated. The distribution of the three components is tunable by varying the applied electric field, which primarily modulates the triplets-(free polaron) reaction rate. The results pave a new route toward understanding the mechanism of organic spintronics for developing of multifunctional devices.

原文English
頁(從 - 到)1376-1382
頁數7
期刊Organic Electronics
14
發行號5
DOIs
出版狀態Published - 2013 五月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 生物材料
  • 化學 (全部)
  • 凝聚態物理學
  • 材料化學
  • 電氣與電子工程

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