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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Development of highly efficient wide band-gap electron transporting materials for deep blue PHOLEDs: synthesis and photophysical properties of electron deficient heterocycles substituted dimethylsilane derivatives

2011년 7월 30일 18시 07분 16초
Ⅰ-IND.P-14 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 <발표Ⅰ>
저자 및
조양진, 정소영, 위경량, 강상욱
고려대학교 소재화학과, Korea
In spite of the successful development of FIrpic-based PHOLED, there are urgent needs for development of efficient deeper blue light emitting devices. However, to use deeper emitters such as Fir6 (ET = 2.82 eV), not only wide band gap host material, but also higher band gap HTL and ETL materials should be introduced. As a consequence, development of wide band gap (T1 > 2.9 eV) host, HTL, and ETL materials has been a subject of interest. Recently, a number of promising host materials were reported, but wide band gap HTL and ETL materials with high charge mobility are still required for efficient deep blue PHOLED. In this study, to obtain wide energy gap ETL materials with high thermal stability, we carefully designed three different type of hetero aromatic building block substituted silane compounds, bis(4-(5-phenyl-1,3,4-oxadiazol-2-yl)phenyl)dimethylsilane (AK22), bis(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)dimethylsilane (AK23), and bis(4-(1-phenyl-1H-benzoimidazol-2-yl)phenyl)dimethylsilane (AK24). All materials were prepared by direct substitution reaction between 2 equiv of lithium reagent and dichlorodimethylsilane in moderate yield. All silane based ETL materials were characterized regarding their optical and thermal properties. Different substitution patterns resulted in high glass-transition temperatures (Tg) of up to 80 oC and triplet energies (ΔE(T1-S0)) of up to 2.95 eV. The application as ETL material for the blue phosphor iridium(III)[bis(4,6-difluorophenyl)-pyridinato-N,C2`]tetrakis(1-pyrazolyl) borate (Fir6) yielded maximum current efficiencies up to 25 cd/A.