Deep-blue light emission with a wide-bandgap naphthalene-derivative liquid organic semiconductor host

Naofumi Kobayashi*, Hiroyuki Kuwae, Juro Oshima, Ryoichi Ishimatsu, Shuya Tashiro, Toshihiko Imato, Chihaya Adachi, Shuichi Shoji, Jun Mizuno

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


We developed a novel naphthalene-derivative to function as a wide-bandgap liquid organic semiconductor (LOS) host material for the limited range of liquid deep-blue light-emitting materials that have been developed to date. The naphthalene-derivative, 1-naphthaleneacetic acid 2-ethylhexyl ester (NLQ) was synthesized as a LOS, by introducing an ethylhexyl group into naphthalene. 9,10-Diphenyl anthracene (DPA) was doped into NLQ as a guest deep-blue dye. From the absorption spectrum, the bandgap energy of NLQ was estimated to be 4.13 eV, indicating that NLQ has the widest bandgap energy of any such host material so far as we know. Deep-blue electroluminescence (EL) emission in a liquid state was obtained by doping DPA into NLQ. Light emission could be achieved by a combination of Förster resonance energy transfer and direct recombination of trapped holes and electrons because the bandgap energy of DPA is straddle by that of the wide-bandgap NLQ. Thus, NLQ is shown to be a promising wide-bandgap LOS host material, which allows deep-blue light emission and may have applications in liquid organic light-emitting diodes.

Original languageEnglish
Title of host publicationOrganic Photonic Materials and Devices XIX 2017
ISBN (Electronic)9781510606432
Publication statusPublished - 2017
EventOrganic Photonic Materials and Devices XIX 2017 - San Francisco, United States
Duration: 2017 Jan 302017 Feb 1


OtherOrganic Photonic Materials and Devices XIX 2017
Country/TerritoryUnited States
CitySan Francisco


  • Energy transfer
  • Liquid organic semiconductor
  • Naphthalene-derivative
  • Wide-bandgap material

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Deep-blue light emission with a wide-bandgap naphthalene-derivative liquid organic semiconductor host'. Together they form a unique fingerprint.

Cite this