New bipolar host materials for realizing blue phosphorescent organic light-emitting diodes with high efficiency at 1000 cd/m2

Min Ju Cho, Sun Jae Kim, Seung Hee Yoon, Jicheol Shin, Tae Ryang Hong, Hyung Jong Kim, Young Hoon Son, Ju Sik Kang, Hyun Ah Um, Tae Wan Lee, Jong-Kwan Bin, Bang Sook Lee, Joong Hwan Yang, Gee Sung Chae, Jang Hyuk Kwon, Dong Hoon Choi
ACS Applied Materials & Interfaces 2014 November 26, 6 (22): 19808-15
New host molecules such as 9-(6-(9H-carbazol-9-yl)pyridin-3-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (pPCB2CZ) and 9-(6-(9H-carbazol-9-yl)pyridin-2-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (mPCB2CZ) were designed and synthesized for blue phosphorescent organic light-emitting diodes (PhOLEDs). The glass transition temperatures of two host molecules were measured higher than 120 °C, and the identical triplet energies were determined to be 2.92 eV for both molecules. The bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic)-doped mPCB2CZ-based PhOLED exhibited practically useful driving voltage of 4.8 V in a simple organic three layer device configuration which has a smaller number of interfaces in conventional multilayer PhOLEDs. Also, the high quantum efficiency of 23.7% is reported at the practically useful brightness value of 1000 cd/m2.

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