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

    Research output: Contribution to journalArticlepeer-review

    40 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 Nov 26

    Bibliographical note

    Publisher Copyright:
    © 2014 American Chemical Society.

    Keywords

    • Bipolar host
    • Carboline
    • Organic light emitting diode
    • Phosphorescence
    • Quantum efficiency

    ASJC Scopus subject areas

    • General Materials Science

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