Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Electroluminescence Properties of Novel Blue-Emitting Materials Based on Spirobifluorene

Spirobifluorene 그룹을 포함하는 새로운 청색 발광 재료의 전계발광

  • Sunwoo, Park (Integrated Engineering, Department of Chemical Engineering, Kyung Hee University) ;
  • Hayoon, Lee (Integrated Engineering, Department of Chemical Engineering, Kyung Hee University) ;
  • Hyukmin, Kwon (Integrated Engineering, Department of Chemical Engineering, Kyung Hee University) ;
  • Godi, Mahendra (Integrated Engineering, Department of Chemical Engineering, Kyung Hee University) ;
  • Sangshin, Park (Integrated Engineering, Department of Chemical Engineering, Kyung Hee University) ;
  • Seungeun, Lee (Integrated Engineering, Department of Chemical Engineering, Kyung Hee University) ;
  • Jongwook, Park (Integrated Engineering, Department of Chemical Engineering, Kyung Hee University)
  • 박선우 (경희대학교 화학공학과 융합공학) ;
  • 이하윤 (경희대학교 화학공학과 융합공학) ;
  • 권혁민 (경희대학교 화학공학과 융합공학) ;
  • ;
  • 박상신 (경희대학교 화학공학과 융합공학) ;
  • 이승은 (경희대학교 화학공학과 융합공학) ;
  • 박종욱 (경희대학교 화학공학과 융합공학)
  • Received : 2022.12.28
  • Accepted : 2023.01.06
  • Published : 2023.02.10
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Abstract

2,7-bis(3',6'-diphenyl-[1,1':2',1"-terphenyl]-4'-yl)-9,9'-spirobi[fluorene] (BTPSF) and 2,7-bis(1,4-diphenyltriphenylen-2-yl)-9,9'-spirobi[fluorene] (BDTSF) were successfully synthesized as novel blue-emission materials for organic light-emitting diodes (OLEDs) based on the spirobifluorene (SBF) moiety. BTPSF and BDTSF were obtained in high purity via a Diels-Alder reaction, without the use of a catalyst. Photoluminescence spectra of the synthesized materials showed maximum emitting wave-lengths of approximately 381 and 407 nm in solution and 395 and 434 nm in the film state, for BTPSF and BDTSF, respectively, indicating ultra-violet and deep blue emission colors. BDTSF was applied as an emissive layer (EML) in non-doped devices and achieved a current efficiency of 0.61 cd/A and an external quantum efficiency (EQE) of 0.46%.

BTPSF와 BDTSF는 유기발광다이오드용 스파이로플루오렌 모이어티를 기반으로 하는 새로운 청색 발광 물질로 성공적으로 합성되었다. BTPSF와 BDTSF는 촉매를 사용하지 않고 Diels-Alder 반응을 통해 합성하여 고순도를 얻었다. 합성된 물질의 광발광 스펙트럼은 용액 상태에서 약 381, 407 nm, 필름 상태에서 각각 395, 434 nm의 최대 발광 파장을 나타내어 자외선과 짙은 청색 발광색을 나타냈다. 합성된 BDTSF 물질은 non-doped 소자의 EML로 적용되었으며, 전류 효율은 0.61 cd/A이다.

Keywords

Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A1A03048004). This work was supported by the Technology Innovation Program (20017422, Development of raw materials and process for ArF-i photoresist) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea). This research was supported by Basic Science Research Capacity Enhancement Project through Korea Basic Science Institute (National research Facilities and Equipment Center) grant funded by the Ministry of Education (No. 2019R1A6C10 10052). This work was supported by the Korea Institute for Advancement of Technology (KIAT) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. P0017363).

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