A wide-energy-gap naphthalene-based liquid organic semiconductor host for liquid deep-blue organic light-emitting diodes
| Autor: | Ryoichi Ishimatsu, Shuya Tashiro, Shuichi Shoji, Jun Mizuno, Chihaya Adachi, Naofumi Kobayashi, Hiroyuki Kuwae, Juro Oshima, Toshihiko Imato |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Absorption spectroscopy Band gap Doping Biophysics Analytical chemistry 02 engineering and technology General Chemistry Electroluminescence 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences Organic semiconductor X-ray photoelectron spectroscopy Light emission 0210 nano-technology HOMO/LUMO |
| Zdroj: | Journal of Luminescence. 200:19-23 |
| ISSN: | 0022-2313 |
| Popis: | We developed a novel naphthalene derivative to function as a wide-energy-gap 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), which shows a low viscosity of 20 mPa·s at 25 °C, was synthesized as a LOS by introducing an ethylhexyl group into naphthalene. We doped 9,10-diphenylanthracene (DPA) into NLQ as a guest deep-blue dye. The highest occupied molecular orbital (HOMO) energy level of NLQ was estimated to be − 6.40 eV from photoelectron spectroscopy measurements in air. The energy gap of NLQ was estimated to be 4.08 eV from its absorption spectrum, indicating that NLQ has the widest energy gap of any such host material to date. The lowest unoccupied molecular orbital energy level of NLQ was calculated to be − 2.31 eV. Deep-blue electroluminescence emission in a liquid state was obtained by doping DPA into NLQ. Light emission could be achieved by a combination of Forster resonance energy transfer and direct recombination of trapped holes and electrons because the energy gap of DPA is straddled by the wider energy gap of NLQ. |
| Databáze: | OpenAIRE |
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