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Proceedings Paper

Deep-blue light emission with a wide-bandgap naphthalene-derivative liquid organic semiconductor host
Author(s): Naofumi Kobayashi; Hiroyuki Kuwae; Juro Oshima; Ryoichi Ishimatsu; Shuya Tashiro; Toshihiko Imato; Chihaya Adachi; Shuichi Shoji; Jun Mizuno
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Paper Abstract

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.

Paper Details

Date Published: 16 February 2017
PDF: 8 pages
Proc. SPIE 10101, Organic Photonic Materials and Devices XIX, 101011B (16 February 2017); doi: 10.1117/12.2251640
Show Author Affiliations
Naofumi Kobayashi, Waseda Univ. (Japan)
Hiroyuki Kuwae, Waseda Univ. (Japan)
Juro Oshima, Nissan Chemical Industries, Ltd. (Japan)
Ryoichi Ishimatsu, Kyushu Univ. (Japan)
Shuya Tashiro, Kyushu Univ. (Japan)
Toshihiko Imato, Kyushu Univ. (Japan)
Chihaya Adachi, Kyushu Univ. (Japan)
Shuichi Shoji, Waseda Univ. (Japan)
Jun Mizuno, Waseda Univ. (Japan)


Published in SPIE Proceedings Vol. 10101:
Organic Photonic Materials and Devices XIX
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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