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제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Electronic Alteration on End-on Phenyl Groups of bis-Triazolyl-silanes: Electron-transport Materials for Blue Phosphorescent

등록일
2016년 2월 25일 14시 58분 48초
접수번호
1985
발표코드
INOR.P-116 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 modified bis(4-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)dimethylsilane (ST), ST-CF3, ST-Me, ST- tBu, and ST-OMe, were designed and prepared by introducing the electron-withdrawing groups or the electron-donating groups at the 4-position of the end-on phenyl groups on the triazole ring. Systematic investigations of their thermal-, photophysical-, and electron-transporting (ET) properties were successfully carried out. Depending on the electronic characteristics of the substituents at the end-phenyl group on the triazole, their frontier orbital energy levels were controlled while maintaining energy band gaps. Low- temperature photoluminiscenec spectra indicate that all the prepared ST moieties maintained high triplet energy states up to 2.85 eV owing to the suppression of electron delocalization by silicon centre. The electron mobilities of all the compounds were investigated by fabricating electron only device (EOD). The EOD of ST-tBu showed significantly higher current density than the other analogs. Finally, the EL device utilizing ST-tBu as an electron transporting material in phosphorescent organic light-emitting diodes with bis[(4,6-di-fluorophenly)-pyridinate-N,C2]picolinate (FIrpic) as a dopant showed an external quantum efficiency of 15%

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