Characterization of Electronic Transport Properties of Polymer Light-Emitting Diodes (PLEDs) by Impedance Spectroscopy

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  • FUJIMOTO Naoki
    Department of Physics and Electronics, Osaka Prefecture University
  • TAKADA Makoto
    Department of Physics and Electronics, Osaka Prefecture University
  • NAGASE Takashi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED)
  • KOBAYASHI Takashi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED)
  • NAITO Hiroyoshi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED)

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  • インピーダンス分光法による高分子発光ダイオードの電荷輸送特性評価
  • インピーダンス ブンコウホウ ニ ヨル コウブンシ ハッコウ ダイオード ノ デンカ ユソウ トクセイ ヒョウカ

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Abstract

<p>Polymer light-emitting diodes (PLEDs) with four different emissive layers were fabricated. The current efficiencies of the optimized PLEDs with Spiro-Red (SR), Super Orange (SO), Spiro-Green (SG) and Super Yellow (SY), are 1.23, 4.33, 7.70, and 11.2cd/A, respectively. Electron and hole drift mobilities (μn, (μp), bimolecular recombination constants (β) of the emissive layers in working PLEDs were determined simultaneously using impedance spectroscopy (IS). The bimolecular recombination constants obtained by the IS measurement were found to be two orders of magnitude smaller than the Langevin recombination constants estimated from electron and hole drift mobilities. It is found that there is correlation between the quantum efficiency estimated from the bimolecular recombination constants and the external quantum efficiency of PLEDs.</p>

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