Molecular design of large-bandgap host materials and their application to blue phosphorescent organic light-emitting diodes

Ju Sik Kang, Tae Ryang Hong, Hyung Jong Kim, Young Hoon Son, Jong Kwan Bin, Bang Sook Lee, Joong Hwan Yang, Jin Wuk Kim, Min Ju Cho, Jang Hyuk Kwon, Dong Hoon Choi

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8 Citations (Scopus)


Abstract New large-bandgap host materials with carbazole and carboline moieties were designed and synthesized for high-performance blue phosphorescent organic light-emitting diodes (PhOLEDs). The two kinds of host materials, 9-(4-(9H-carbazol-9-yl)phenyl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (pP2CZCB) and 9-(3-(9H-carbazol-9-yl)phenyl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (mP2CZCB), displayed promisingly high triplet energies of ∼2.92-2.93 eV for enhancing the exothermic energy transfer to bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) (FIrpic) in PhOLED devices. It was found that the blue PhOLEDs bearing the new host materials and the FIrpic dopant exhibited markedly higher external quantum efficiencies (EQEs) than a device made with 1,3-bis(N-carbazolyl)benzene (mCP) as the host. In particular, the PhOLED device made with 3 wt% FIrpic as the dopant and mP2CZCB as the host material displayed a low driving voltage of 4.13 V and the high EQE of 25.3% at 1000 cd m-2.

Original languageEnglish
Article number3182
Pages (from-to)218-224
Number of pages7
JournalOrganic Electronics
Publication statusPublished - 2015 Jul 27

Bibliographical note

Funding Information:
This research was supported by National Research Foundation of Korea ( NRF2012R1A2A1A01008797 ) and by Key Research Institute Program ( NRF201200020209 ). D.H. Choi particularly thank for the support from LG display Co. Limited (2013–2014).

Publisher Copyright:
© 2015 Elsevier B.V.

Copyright 2019 Elsevier B.V., All rights reserved.


  • Blue phosphorescence
  • Carbazole
  • Carboline
  • Host material
  • Organic light emitting diode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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