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학술발표회초록보기

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제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Silicon-based electron-transport materials with high thermal stability and triplet energy for efficient phosphorescent OLEDs

등록일
2016년 2월 25일 15시 01분 25초
접수번호
1988
발표코드
INOR.P-117 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 22일 (금요일) 13:00~14:30
발표형식
포스터
발표분야
무기화학
저자 및
공동저자
김진형, 손호진*, 한원식1,*, 강상욱2,*
고려대학교 신소재화학과, Korea
1서울여자대학교 화학과, Korea
2고려대학교 소재화학과, Korea
A series of electron transporting materials was designed and used in organic light-emitting diodes (OLEDs), exhibiting green phosphorescence. We used the tetrahedral structural motif of silicon atom, which annulated with the 1,2-diphenyl-benzoimidazole (DBI) units in its periphery (1–4) and their thermal, photophysical, and electrochemical properties were investigated. Among the series, the X-ray crystal structure of compound 1 was obtained and investigated. Photophysical and electrochemical properties showed that their LUMO levels can be slightly tuned as increasing number of DBI units and enhancing the electron injection capability. Furthermore, thermal stability correlated well with an increase in the number of DBI units, showing a gradual increase in Tg values in the range of 100–141 °C. The electron-only devices (EOD) based on compounds 2 and 3 were fabricated; EOD device with compound 3 showed higher current densities at the same voltages, indicating higher electron transport (ET) capability compared to compound 2. The electron mobilities (μ) of compounds 2 and 3 were estimated as 1.93 × 10−5 cm2/V and 3.67 × 10−5 cm2/V at 1 MV/cm, respectively. We further investigated the excellent ET property of compound 3via the phosphorescent OLEDs in which the electron-transporting material (ETM) was coupled with the green emitter, Ir(ppy)2. Finally, we compared it with the device based on compound 2. The OLEDs device with compound 3 exhibited maximum current and external quantum efficiencies of 62.8 cd/A and 18.0%, respectively, with a small efficiency roll-off at high current densities.

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