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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Blue Phosphorescent Iridium compounds based on bipyridine ligand

등록일
2014년 8월 28일 15시 49분 33초
접수번호
1147
발표코드
INOR.P-238 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
무기화학
저자 및
공동저자
강영진*, 이지은1, 류연진1, 오한국2, 오시현3, 이종원3, 김진호3
강원대학교 과학교육과, Korea
1강원대학교 과학교육학부, Korea
2강원대학교 일반대학원 화학과, Korea
3강원대학교 화학과, Korea
Two blue phosphorescent Ir(III) compounds with a main fluorine-free bipyridine ligand have been synthesized. These molecules have the general formula of Ir(C?N)2(L?X), where C?N = 2',6'-dimethoxy-4-methyl-2,3'-bipyridine [(MeO)2pypy] and L?X = ancillary ligand, such as acetylacetonate (acac) (1) or 2-picolinate (pic) (2). Thermal, photophysical, and electrochemical properties for 1 and 2 have also been investigated systematically. The two compounds show high thermal stability with decomposition temperatures at ~ 350 °C due to strong and varied intermolecular interactions. A sky-blue emission with moderate phosphorescence quantum efficiency (ΦPL= 0.49~0.54) is observed in the spectral region of 460-470 nm for all compounds, which is attributed to both metal-to-ligand charge transfer (MLCT) and ligand-centered (LC) transition. Compounds 1 and 2 show only ~10 nm red-shifted emission in the fluid state, compared to similar fluorinated iridium counterparts. Multi-layered electroluminescent devices using compounds 1 and 2 as the dopant and 9-(3-(9H-carbazol-9-yl)phenyl)-9H-carbazol-3-yl)diphenylphosphine oxide as a host material have been fabricated. The electroluminescent device of 2 at the doping level of 5 wt% shows the best performance with an external quantum efficiency of 15.3% and the color coordinate of (0.16, 0.28) at a brightness of 100 cd/m2.

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