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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Role of Hole Mobility on Power Efficiency in Mixed Host System of Deep Blue Phosphorescent Organic Light Emitting Devices

등록일
2011년 7월 27일 23시 55분 36초
접수번호
0271
발표코드
Ⅰ-IND.P-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 <발표Ⅰ>
발표형식
포스터
발표분야
공업화학
저자 및
공동저자
위경량, 강상욱
고려대학교 소재화학과, Korea
We report on the systematic investigation of the relationship between hole mobility of host materials and device performance to maximize the power efficiency. Three different materials with different hole mobilities were used as host materials of iridium(III)[bis(4,6-difluorophenyl)pyridinato-N,C2′]tetrakis(1-pyrazolyl)borate FIr6 based deep blue phosphorescent organic light-emitting device (PHOELD). Host material, tris(4-(N-carbazolyl)phenyl)methylsilane (MCBP), with higher hole mobility (1.1 × 10?3 cm2V?1s?1), can accommodate more electron current carried by an n-type host, bis(4-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)dimethylsilane (SiTAZ), than any other p-type hosts with lower hole mobility, maintaining the charge balance between hole and electron current. As a result, the device shows high efficiency of 19.0%, high power efficiency of 23.5 lm/W, low efficiency roll off, and deep blue color coordinates of (0.15, 0.23). Owing to the high glass transition temperature (155 oC), MCBP is expected to be a promising candidate material for commercial deep blue PHOLEDs.

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