16 February 2017 Deep-blue light emission with a wide-bandgap naphthalene-derivative liquid organic semiconductor host
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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.
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Naofumi Kobayashi, Naofumi Kobayashi, Hiroyuki Kuwae, Hiroyuki Kuwae, Juro Oshima, Juro Oshima, Ryoichi Ishimatsu, Ryoichi Ishimatsu, Shuya Tashiro, Shuya Tashiro, Toshihiko Imato, Toshihiko Imato, Chihaya Adachi, Chihaya Adachi, Shuichi Shoji, Shuichi Shoji, Jun Mizuno, Jun Mizuno, } "Deep-blue light emission with a wide-bandgap naphthalene-derivative liquid organic semiconductor host", Proc. SPIE 10101, Organic Photonic Materials and Devices XIX, 101011B (16 February 2017); doi: 10.1117/12.2251640; https://doi.org/10.1117/12.2251640
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