ETRI Journal

  • 제24권6호
  • /
  • Pages.409-414
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  • 2002
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  • 1225-6463(pISSN)
  • /
  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
권호 표지

Excimer and Aggregate Formations in Poly(fluorene)s

  • Lee, Jeong-Ik (Basic Research Laboratory, ETRI) ;
  • Lee, Victor Y. (IBM Almaden Research Center) ;
  • Miller, Robert D. (IBM Almaden Research Center)
  • 투고 : 2001.12.31
  • 발행 : 2002.12.31
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초록

This paper investigates the absorption and emission changes in poly(di-n-hexylfluorene)s. We prepared the poly(di-n-hexylfluorene)s end capped with 2-bromofluorene, 2-bromo-9,9-di-n-hexylfluorene, and 9-bromoanthracene through Ni (0) mediated polymerization. In addition, we also synthesized a structurally distorted copolymer of 2,7-dibromo- 9,9-di-n-hexylfluorene and 9,9-bis(4-bromophenyl) fluorene end capped with 2-bromofluorene through the same polymerization method. The absorption and emission changes of these polymers between before and after thermal annealing in a nitrogen atmosphere clarify the role of aggregate/excimer formation in poly(fluorene)s. The large absorption changes must be attributed to aggregate formation (ground state interaction), which causes only a slight red shift of the vibronically structured emission bands. We assign the additional long wavelength emission as an excimer band (excited state interaction), which is preferably formed at chain ends.

키워드

참고문헌

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