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제126회 대한화학회 학술발표회 및 총회 Two Bipyridine-based Organic Compounds Available As Potential Host Materials in OLEDs

등록일
2020년 9월 8일 11시 54분 22초
접수번호
0885
발표코드
ORGN.P-387 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 21일(수) 17:00~17:30
발표형식
포스터
발표분야
Organic Chemistry
저자 및
공동저자
Suk-Hee Moon, Youngjin Kang1,*, Ki-Min Park2,*
Department of Food & Nutrition, Kyungnam College of Information & Technology, Korea
1Division of Science Education, Kangwon National University, Korea
2Research Institute of Natural Science, Gyeongsang National University, Korea
Recently the lack of examples for blue emitting materials has resulted in the resurgence in the development of blue phosphorescent materials. Henceforth, it needs an efficient molecular design incorporating bipyridine with high triplet energy and other functional unit with a suitable coordination site to metal ion through the chelation mode. The low selectivity and reactivity of pyridine ring, however, makes it very hard to introduce varied substituents into pyridine ring. In addition, it is scarce to find examples of structural characterization of bipyridine based organic compounds applicable to OLEDs performances.
In terms of OLEDs efficiency and stability, platinum and palladium complexes with tetradentate ligands are known to be very good candidates recently. The strategy of tetradentate ligand design is that the covalent C, N and O atoms are placed on a proper location of the ligand framework in order to form five- or six-membered metallacycle through C^N*C^N, N^C*C^N and C^C*N^N coordination modes while they are bound to metal(II) ion. For this purpose, 2’,6’-difluoro-6-[3-(pyridin-2-yloxy)phenyl]-2,3’-bipyridine (1) and 2’,6’-dimethoxy-6-[3-(pyridin-2-yloxy)phenyl]-2,3’-bipyridine (2) have been synthesized by typical cross coupling reactions and have been characterized by single-crystal X-ray diffraction. Compound 1 bearing fluorine substituents emits strong fluorescence with λmax = 325 nm, while methoxy-substituted compound 2 displays red-shifted emissions with λmax = 366 nm. Both compounds have high triplet energies (T1) of 2.64 to 2.65 eV. This high triplet energy makes both compounds available as potential host materials in organic light-emitting diodes (OLEDs).
Herein, we present for the structural and photophysical characteristics depending on the different substituents of the bipyridine system in two potential dianionic tetradentate ligands, 1 and 2.

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