Organic Light-Emitting Transistors Based on Pentacene and 4,5-Di(9 H-carbazol-9-yl)phthalonitrile Doped onto 1,3-Bis(N-carbazolyl)benzene

Dae Kyu Kim, Yoo Lim Kim, Jong Ho Choi

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6 Citations (Scopus)


In this study, multilayered, organic-based light-emitting transistors (OLETs) were produced and characterized. The neutral cluster beam deposition method was applied to successively deposit organic semiconducting layers of pentacene, 4,5-di(9H-carbazol-9-yl)phthalonitrile (2CzPN) doped onto 1,3-bis(N-carbazolyl)benzene (mCP), and 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) as the hole-transport, emissive, and electron-transport layers, respectively. The effects of drain electrodes (Au or Li/Al) and TPBi on the device performance were examined under ambient conditions. The bilayered pentacene (bottom, 50 nm)/mCP:2CzPN (top, 50 nm) and trilayered pentacene (bottom, 50 nm)/mCP:2CzPN (middle, 50 nm)/TPBi (top, 10 nm) OLETs demonstrated both electrical switching functionality and control of electroluminescence (EL) in air. In particular, the EL intensity (IEL) was significantly enhanced in the asymmetric bilayered devices adopting a low work function Li/Al drain electrode owing to the lower electron injection barrier. The operating light emission mechanisms responsible for the observed EL and recombination zone were discussed with the aid of photographic images provided by a charge-coupled device camera.

Original languageEnglish
Pages (from-to)11063-11072
Number of pages10
JournalJournal of Physical Chemistry C
Issue number17
Publication statusPublished - 2019 May 2

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF20100020209 and NRF2017R1D1A1B03027893).

Publisher Copyright:
© 2019 American Chemical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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