Molecular modification on bisphenanthroimidazole derivative for deep-blue organic electroluminescent material with ambipolar property and high performance

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yi Yuan
  • Guang-Fu Wu
  • Huai-Xin Wei
  • Jun Ye
  • Miao Chen
  • Feng Lu
  • Qing-Xiao Tong
  • Fu-Lung Wong

Detail(s)

Original languageEnglish
Pages (from-to)159-166
Journal / PublicationOrganic Electronics: physics, materials, applications
Volume17
Publication statusPublished - Feb 2015

Abstract

Efficient deep-blue fluorescent emitters are of particular significance in organic light-emitting devices (OLEDs). An ambipolar deep-blue emitter, 4,4′-bis(4-(1-(4-(tert-butyl)phenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)-1,1′-binaphthalene (2NBTPI), was designed, synthesized and applied in a high-efficiency deep-blue emitting OLED. By modifying with binaphthyl, 2NBTPI exhibits a high thermal stability, deep blue emission as well as spatially separated HOMO and LUMO orbits. Comparing with its mononaphthyl counterpart 1,4-bis(4-(1-(4-(tert-butyl)phenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)naphthalene (NBTPI), 2NBTPI shows more balanced charge transport properties, better color purity (color index: (0.15, 0.09) versus (0.15, 0.11)), higher external quantum efficiency (EQE) (5.95% versus 5.73%) and slower efficiency roll-off (EQE roll-off at 100 mA cm-2: 13.1% versus 27.6%). To the best of our knowledge, OLED performances of 2NBTPI are comparable to the best reported non-doped deep-blue emitters.

Research Area(s)

  • Binaphthyl sapcer, Deep-blue electroluminescence, Low roll-off, Phenanthroimidazole

Citation Format(s)

Molecular modification on bisphenanthroimidazole derivative for deep-blue organic electroluminescent material with ambipolar property and high performance. / Chen, Wen-Cheng; Yuan, Yi; Wu, Guang-Fu; Wei, Huai-Xin; Ye, Jun; Chen, Miao; Lu, Feng; Tong, Qing-Xiao; Wong, Fu-Lung; Lee, Chun-Sing.

In: Organic Electronics: physics, materials, applications, Vol. 17, 02.2015, p. 159-166.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review