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Organic light emitting diodes with nanostructured ultrathin layers at the interface between electron- and hole-transport layers

Kato, Keizo    (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Takahashi, Kazuki    (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Suzuki, Keisuke    (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Sato, Takayuki    (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Shinbo, Kazunari    (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Kaneko, Futao    (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Shimizu, Hidehiko    (Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Tsuboi, Nozomu    (Department of Material Science and Technology, Niigata University, Ikarashi 2-8050, Niigata 950-2181, Japan   ); Tadokoro, Toyoyasu    (R&D Center, Nippon Seiki Co., Ltd., 1-190-1 Fujihashi, Nagaoka 940-2141, Japan  ); Ohta, Shinichi  
  • 초록

    Abstract Organic light emitting diodes (OLEDs) with nanostructured ultrathin layers inserted at the interface between electron- and hole-transport layers were investigated. The fundamental structure of the OLEDs fabricated by a vacuum evaporation method was indium-tin-oxide (ITO) anode/copper phthalocyanine (CuPc)/ N,N ′ -diphenyl- N,N ′ - bis (3-methylphenyl)-1,1 ′ -diphenyl-4,4 ′ -diamine (TPD)/8-hydroxyquinoline aluminum (Alq 3 )/LiF/Al cathode. Fullerene (C 60 ) and rhodamine B (RhB) molecules were used as the nanosutructured ultrathin layers inserted at the interface between the Alq 3 and TPD layers. The electroluminescent (EL) properties have been measured for the OLEDs with C 60 and RhB ultrathin layers and the dependences on the thickness and the position of the inserted layers were examined. For the OLEDs with the C 60 ultrathin layer, the improvements of the drive voltage and EL efficiency were observed. The OLED with the inserted C 60 ultrathin film of a monolayer thickness showed the highest efficiency, which was twice as large as that without C 60 layer. On the contrary, the improvements were not observed for the OLEDs with the RhB ultrathin layer.


  • 주제어

    Organic light emitting diode .   Nanostructured ultrathin layer .   Electroluminescent property .   Fullerene .   Rhodamine B.  

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