High-Efficiency Carrier Injection Characteristics of Dixanthene Derivatives in Organic Light-Emitting Diodes

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  • Yoshida Masafumi
    Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST)
  • Tsuchida Teppei
    Functional Chemicals Research Laboratories, Nippon Kayaku Co.
  • Kurata Takaaki
    Functional Chemicals Research Laboratories, Nippon Kayaku Co.
  • Ikeda Masaaki
    Functional Chemicals Research Laboratories, Nippon Kayaku Co.
  • Sasabe Hiroyuki
    Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST)
  • Adachi Chihaya
    Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST)

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Abstract

We demonstrate that benzo[1,2,3-kl:4,5,6-k′l′]dixanthene (BDX) derivatives show high-efficiency carrier injection in organic light-emitting diodes (OLEDs). Using 3,11-dibromobenzo[1,2,3-kl:4,5,6-k′l′]dixanthene (BDX6) as a hole injection layer (HIL), we achieved a low driving voltage of 8.12±0.10 V in obtaining a current density of J=100 mA/cm2. The hole injection characteristics were superior to those of a device with a conventional CuPc layer as a HIL. On the other hand, inserting benzo[1,2,3-kl:4,5,6-k′l′]dixanthene (BDX1) as an electron injection layer (EIL) efficiently decreased driving voltage, indicating a superior electron injection capability compared with a device without a BDX1 EIL. We show that carrier injection efficiency can be well controlled by the substituent groups of BDX, thus providing efficient hole and electron injection layers.

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