Current Applied Physics

Korean Physical Society (한국물리학회)
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Blue organic light-emitting diodes with 2-methyl-9,10-bis(naphthalen-2-yl)anthracene as hole transport and emitting layer and the impedance spectroscopy analysis

  • Zhang, Xiao-Wen (School of Materials Science and Engineering, Guilin University of Electronic Technology) ;
  • Mo, Bing-Jie (School of Materials Science and Engineering, Guilin University of Electronic Technology) ;
  • Liu, Li-Ming (Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute) ;
  • Wang, Hong-Hang (Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute) ;
  • Chang, Dan-Teng (School of Materials Science and Engineering, Guilin University of Electronic Technology) ;
  • Xu, Ji-Wen (School of Materials Science and Engineering, Guilin University of Electronic Technology) ;
  • Wang, Hua (School of Materials Science and Engineering, Guilin University of Electronic Technology) ;
  • Wei, Bin (Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University)
  • Received : 2014.06.11
  • Accepted : 2014.08.25
  • Published : 2014.11.30
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Abstract

2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN) based fluorescent blue organic light-emitting diodes (OLEDs) are demonstrated. With MADN as emitting layer, experiments indicate that thick MADN (40-60 nm) is preferable for constructing efficient blue OLED. With MADN as hole-transport and emitting layer and tris(8-hydroxy-quinolinato)aluminium ($Alq_3$) as electron-transport layer, the OLED electroluminescent characteristics show a mixture emission of MADN and $Alq_3$ with Commission Internationale d'Eclairage (CIE) color coordinates of (0.25, 0.34), indicating feasible hole transporting in MADN. Using 4,7-diphenyl-1,10-phenanthroline (BPhen) replacing $Alq_3$ as electron-transport layer, the OLED shows deep blue emission with a maximum luminous efficiency of 4.8 cd/A and CIE color coordinates of (0.16, 0.09). The hole transport characteristics of MADN are further clarified by constructing hole-only device and performing impedance spectroscopy analysis. The results indicate that MADN shows superior hole-transport ability which is almost comparable to typical hole-transport material of N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (NPB), suggesting a promising application for constructing efficient blue OLED with integrated hole-transport layer and emitting layer.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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