화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.24, No.2, 211-219, March, 2000
Export Citation
액정성 고분자 블렌드의 편발광
Polarized Light Emission of Liquid Crystalline Polymer Blends
김영철†, 조현남, 김동영, 홍재민, 송남웅1, 김동호1, 김정엽
  • 한국과학기술연구원 정보재료소자연구센터
  • 1한국표준과학연구원 분광연구그룹
Young Chul Kim†, Hyun Nam Cho, Dong Young Kim, Jae-Min Hong, Nam Woong Song1, Dongho Kim1, and Chung Yup Kim
  • Polymer Materials Laboratory, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea
  • 1Characterization and Spectroscopy Laboratory, Korea Research Institute of Standards and Science, P.O. Box 102, Yusong, Taejon 305-600, Korea
E-mail:
초록
액정성을 가지는 플로렌계 발광고분자에 비액정성 플로렌계 발광고분자를 첨가한 블렌드를 제조하여 에너지전달 효과와 흡광 및 발광 이방성에 대하여 고찰하였다. 비액정성 고분자를 액정성고분자에 0.5wt% 첨가하고 360nm로 여기한 결과, 420nm에서 관찰되었던 액정성 고분자의 발광피크는 거의 사라졌으며 대신 비액정성 고분자에 의한 480nm에서의 새로운 발광피크가 관찰되었다. 블렌드 시료의 480nm 발광은 비액정성 고분자가 2.0wt% 첨가되었을 때 가장 강했으며, 발광강도는 블렌딩 이전의 각 고분자보다 13배 증가하였다. 블렌드내의 분자들을 마찰 폴리이미드기판상에서 가열-냉각시켜 배향시키면 시료의 발광 이방성과 order parameter 는 각각 2.0 및 0.25를 나타내었다. 시간 상관 단광자 계수법(TCSPC)에 의해 고찰한 결과, 마찰 폴리이미드 기판상에서의 배향에 의해 두 발광고분자간의 에너지전달에 필요한 시간은 93 ps만큼 단축되며 에너지전달 효율은 9% 증가함을 알 수 있었다.
Fluorene-based light emitting polymer blends with liquid crystalline characteristics were studied on effective energy transfer and dichroic characteristics. Incorporating 0.5wt% of the non-liquid crystalline into the liquid crystalline polymer suppressed the PL emission at 420nm on photoexicitation at 360nm, but generated a new PL emission of the non-liquid crystalline polymer at 480nm. The highest PL intensity at 480nm, which was 13 times stronger than those of the two polymers before blending, was observed for a blend with 2.0wt% of the non-liquid crystalline polymer. When the molecules of the blends were aligned on a rubbed polyimide surface by a heating-cooling process, the dichroic ratio and the order parameter were 2.0 and 0.25 respectively. Time-correlated single photon counting(TCSPC) study revealed that the time required for energy transfer between the two chromophores was shortened by 93 ps when the blends were aligned on the rubbed polyimide surface by the heating-cooling process. The thermal treatment also enhanced the energy transfer efficiency by 9%.
Keywords:photoluminescence;polarized light emission;liquid crystalline polymer blend;energy transfer;time-correlated single photon counting(TCSPC)
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