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  • 08월 18일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Carbazole/Triazole Hybrid Wide Band-gap Bipolar Host Materials for Blue Phosphorescent OLEDs

등록일
2011년 7월 30일 18시 18분 49초
접수번호
0776
발표코드
Ⅰ-IND.P-17 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 <발표Ⅰ>
발표형식
포스터
발표분야
공업화학
저자 및
공동저자
정소영, 조양진, 위경량, 강상욱
고려대학교 소재화학과, Korea
To achieve a highly efficient phosphorescent OLED, a triplet emitter is normally doped into a host material to reduce concentration quenching. It is essential that the triplet energy of the host is higher than that of the emitter in order to prevent energy back transfer from the phosphorescent guest to the host. This becomes more challenging for host materials used in combination with blue phosphorescent emitters, where triplet energies larger than 2.8 eV are required. Recent developments of new matrix materials for phosphorescent organic light-emitting diodes often focus on the synthesis of bipolar materials. In this report, to achieve a wide band-gap bipolar host material with high thermal stability, a silicon atom was introduced between 4-(N-carbazolyl)phenyl (p-type) and 3,4,5-triphenyl-1,2,4-triazole (n-type) molecules. As a result, [(4-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)(4-(carbazol-9-yl)phenyl)]dimethylsilane (AK41) was prepared by direct substitution reaction with dimethyldichlorosilane. AK41 was showed a wide band-gap and high glass transition temperature of 73 oC. By employing AK41 as a bipolar host material of iridium(III)[bis(4,6-difluorophenyl)pyridinato-N,C2’]tetrakis (1-pyrazolyl)borate (FIr6) based deep blue phosphorescent OLEDs, deep blue color coordinates of (0.15, 0.24) were achieved.

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