Fabrication and Characterization of Solution Processable Inverted Organic Light-Emitting Diodes Using Polyethyleneimine with Different Chemical Structures as an Electron Injection Layer

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  • MAYUMI Takahiro
    Department of Physics and Electronics, Osaka Prefecture University
  • TAKADA Makoto
    Department of Physics and Electronics, Osaka Prefecture University
  • MORII Katsuyuki
    Nippon Shokubai Co., Ltd.
  • NAGASE Takashi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED), Osaka Prefecture University
  • KOBAYASHI Takashi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED), Osaka Prefecture University
  • NAITO Hiroyoshi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED), Osaka Prefecture University

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  • 異なる構造を有するポリエチレンイミンを電子注入層とした塗布型逆構造有機発光ダイオードの作製と特性評価
  • コトナル コウゾウ オ ユウスル ポリエチレンイミン オ デンシ チュウニュウソウ ト シタ トフガタ ギャクコウゾウ ユウキ ハッコウ ダイオード ノ サクセイ ト トクセイ ヒョウカ

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Abstract

<p>Inverted organic light-emitting diodes (inverted OLED) with a bottom cathode have been extensively studied as an alternative to conventional OLED. The main advantage of the inverted OLEDs is that the inverted OLEDs avoid the use of reactive cathode (e.g., Ca, LiF) and therefore allow the preparation of the inverted OLEDs without rigorous encapsulation. In this study, solution processable inverted OLEDs were fabricated using polyethyleneimine (PEI) with different ratios of primary, secondary and tertiary amines as an electron injection layer. The best current efficiencies of the inverted OLEDs with three different PEIs, P-1000, SP-200 and SP-003, are 9.0, 9.4 and 11cd/A, respectively. Photovoltaic measurements revealed that the improvement of the current efficiency of the inverted OLEDs with SP-003 is attributable to the lowering of the electron injection barrier. The optimization of chemical structures of PEI is key importance for the improvement of the current efficiency of inverted OLEDs.</p>

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