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Shimizu M.,Kyoto University | Kaki R.,Kyoto University | Takeda Y.,Kyoto University | Hiyama T.,Kyoto University | And 4 more authors.
Angewandte Chemie - International Edition | Year: 2012

Molecular fluorophores of type A-π-D-π-A (D=donor, A=acceptor) demonstrate solid-state emission in the red to near-infrared region with high efficiency. The emission color can be tuned through the substituents on the diarylamino and cyanophenyl moieties. The electroluminescence performance of the designed fluorophore confirms its potential as an emitter for use in organic light-emitting devices. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Shimizu M.,Kyoto University | Mochida K.,Kyoto University | Asai Y.,Kyoto University | Yamatani A.,Kyoto University | And 5 more authors.
Journal of Materials Chemistry | Year: 2012

We synthesised 12,12-diisopropyl-7-methyl-12H-indololo[3,2-d]-naphtho[1,2- b][1]silole from 1-bromo-2-naphthol via four steps. The silylene-bridged 2-(2-naphthyl)indole exhibited intense blue photoluminescence in solution and in the solid state. For example, the fluorescence maximum of the powder appeared at 476 nm with a high quantum yield (Φ = 0.70). The organic light-emitting device using the silylene-bridged indole as a light-emitting layer demonstrated a high current efficiency of 3.80 cd A -1 and a power efficiency of 3.64 lm W -1 at 10 mA cm -2 with excellent colour coordinates (0.152, 0.094), while the device fabricated with the blue-emissive indole as a dopant achieved even higher current and power efficiencies of 6.68 cd A -1 and 5.58 lm W -1, respectively, at 10 mA cm -2. © 2012 The Royal Society of Chemistry.

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