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

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35 Citations (Scopus)

Abstract

New host molecules such as 9-(6-(9 H-carbazol-9-yl)pyridin-3-yl)-6-(9 H-carbazol-9-yl)-9 H-pyrido[2,3-b]-indole (pPCB2CZ) and 9-(6-(9H-carbazol-9-yl)pyridin-2-yl)-6-(9 H -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. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)19808-19815
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number22
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)

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    Cho, M. J., Kim, S. J., Yoon, S. H., Shin, J., Hong, T. R., Kim, H. J., Son, Y. H., Kang, J. S., Um, H. A., Lee, T. W., Bin, J. K., Lee, B. S., Yang, J. H., Chae, G. S., Kwon, J. H., & Choi, D. H. (2014). New bipolar host materials for realizing blue phosphorescent organic light-emitting diodes with high efficiency at 1000 cd/m2 ACS Applied Materials and Interfaces, 6(22), 19808-19815. https://doi.org/10.1021/am505049h