Journal of the Semiconductor & Display Technology (반도체디스플레이기술학회지)

The Korean Society Of Semiconductor & Display Technology (한국반도체디스플레이기술학회)
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Recycling of Organic Materials Using Purification by Recrystallization for Solution-Processed OLEDs

재결정화법에 의한 유기물 재활용 및 이를 이용한 습식 OLED 제작

  • Lee, Jin-Hwan (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education) ;
  • Hong, Ki-Young (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education) ;
  • Shin, Dong-Kyun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education) ;
  • Lee, Jin-Young (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education) ;
  • Park, Jong-Woon (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education) ;
  • Seo, Hwa-Il (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education) ;
  • Seo, Yu Seok (Advanced Technology Research Team, YOULCHON CHEMICAL, CO., LTD.)
  • 이진환 (한국기술교육대학교 전기.전자.통신공학부) ;
  • 홍기영 (한국기술교육대학교 전기.전자.통신공학부) ;
  • 신동균 (한국기술교육대학교 전기.전자.통신공학부) ;
  • 이진영 (한국기술교육대학교 전기.전자.통신공학부) ;
  • 박종운 (한국기술교육대학교 전기.전자.통신공학부) ;
  • 서화일 (한국기술교육대학교 전기.전자.통신공학부) ;
  • 서유석 ((주)율촌화학 기술연구소 선행연구팀)
  • Received : 2016.03.10
  • Accepted : 2016.03.23
  • Published : 2016.03.31
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Abstract

We have investigated the possibility of recycling of an organic material that is wasted during thermal evaporation. To this end, we have collected a wasted organic material (N,N'-diphenly-N,N'-bis(1,1'-biphenyl)-4,4'-diamine(NPB)) from a vacuum chamber, purified it by recrystallization, and fabricated bilayer organic light-emitting diodes (OLEDs) with the recycled NPB. It is found that the surface roughness of thin films coated with the purified NPB is much enhanced. OLEDs fabricated by thermal evaporation of the purified NPB show lower device efficiency than OLEDs with the original NPB. However, the power efficiency of OLED fabricated by spin coating of the purified NPB is comparable with that of OLED with the original NPB. Therefore, such a recycling method by recrystallization would be more suitable for solution-processed OLEDs.

Keywords

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