Benzimidazole-Based Electron-transporting Materials for Electroluminescent Device

• Main Authors: Mei-yi Lai, 賴玫儀
• Other Authors: 林建村, 賴重光
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/50617214927555758573

碩士 === 國立中央大學 === 化學研究所 === 95 === In this study, we have sucessfully synthesized a series of compound containing benzimidazole and/or arylamine moieties. These compounds emit from purple- blue to orange-red. These compounds are amorphous with glass transition temperatures ranging from 104 to 170 oC and high thermal decomposition temperature (Td > 340 oC) . Among them, EF-I-N, EF-I-N2, SPY-I-N exhibited both good electron- and hole-transporting (mobilities ~10-5 cm2/(V·s)) and emitting abilities. The single-layer devices (ITO/cpd/LiF/Al) of them showed good performance( ext 3.5%; 1.8 lm/W; 3.6 cd/A at 100 mA/cm2 for EF-I-N based device). In addition, bi-layer electroluminescent devices of good performance ( ext 4.2%；3.1 lm/W；4.4 cd/A at 100 mA/cm2 for EF-I-N based device) have also been achieved using these materials as the electron-transporting and emitting layer. Compound EF-II can be used as electron-transporting layer. The device using Alq3 as the emitting layer and NPB as the hole-transporting layer, ITO/NPB/Alq3/EF-II/LiF/Al, exhibited good performance: ext 1.9%; 3.2 lm/W; 5.9 cd/A at 100 mA/cm2. Moreover, SPY-I-N can serve as a good host for phosphorescent materials. The single-layer device, ITO/SPY-I-N:Ir(fbi)2(acac) 5% (80 nm)/LiF/Al, usingIr(fbi)2(acac) as emissive dopant exhibited high efficiency: ext 6.9%；4.4 lm/W；20 cd/A at 100 mA/cm2.