文献类型：期刊文献

英文题名：Two novel phenanthrene-based host materials in red and green organic light-emitting devices with low efficiency roll-off

作者：Wang, Yuanyuan[1,2];Song, Wenxuan[1,2];Zhou, Li[1,2];Liang, Wenting[3];Mu, Haichuan[4];Huang, Jinhai[5];Su, Jianhua[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Shanxi Univ, Inst Environm Sci, Taiyuan 030006, Shanxi, Peoples R China;[4]East China Univ Sci & Technol, Sch Sci, Dept Phys, 130 Meilong Rd, Shanghai 200237, Peoples R China;[5]Shanghai Taoe Chem Technol Co Ltd, Shanghai, Peoples R China

年份：2018

卷号：42

期号：22

起止页码：17975

外文期刊名：NEW JOURNAL OF CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000452672700015)】；

基金：We acknowledge the support from the National Natural Science Foundation of China (NSFC. 21790361).

语种：英文

摘要：Two new organic small molecules composed of phenanthrene, carbazole and an electron deficient moiety were synthesized by a Suzuki coupling reaction. It is particularly intriguing to compare the electroluminescent (EL) properties of PBBM and PBTZ, which have the same molecular structure with the respective high T-d at around 436 degrees C and 423 degrees C. By changing the electron deficient moiety of the C9-position of phenanthrene, the photophysical, electrochemical and electroluminescent properties of these two compounds showed significant differences. Furthermore, green and red phosphorescent organic light emitting diodes (OLEDs) employing PBBM and PBTZ as host materials exhibited low efficiency roll-off, and the red OLEDs based on both compounds revealed better EL performance than those of the green OLEDs. Especially, the PBBM-hosted green and red OLEDs achieved a maximum EQE of 14.3% and 18.2%, respectively.