A5102008227- Semiconductor Lasers and Optical Devices
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- X-ray Diffraction in Crystallography
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- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
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Fujifilm (Japan)
2003-2023
Saitama University
2011-2023
National Institute of Technology, Sasebo College
1994-2019
Tokai University
2019
National Astronomical Observatory of Japan
1983-2014
Tokyo Denki University
2014
Japan Aerospace Exploration Agency
2014
Yamaha (Japan)
2013
Kumamoto University
2006-2012
Kitasato University
2011
A state-of-the-art organic semiconductor that has high effective electron mobility and outstanding robustness was developed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2,2',4,4',6,6'-Hexabromodiphenylcarbene. The First Stable Triplet Carbene in Fluid Solution at Low Temperature and the Crystal State Room TemperatureHideo Tomioka, Tetsuya Watanabe, Katsuyuki Hirai, Katsuhiko Furukawa, Takeji Takui, Koichi ItohCite this: J. Am. Chem. Soc. 1995, 117, 23, 6376–6377Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June...
In this paper, the molecular design of first deep-lowest unoccupied orbital (LUMO) level diimide π-electron core, benzo[ c]thiophene (BTDI), as a novel n-type organic semiconductor was determined. An original synthetic sequence devised to obtain target cyclohexyl-BTDI (Cy6-BTDI) derivative. Cy6-BTDI demonstrated completely reversible reduction waves and stable radical anionic state. Favorable brickwork assembly two-dimensional charge transport properties were exhibited in solid As result,...
A new class of solution-processable thieno[3,2-<italic>f</italic>:4,5-<italic>f</italic>′]bis[1]benzothiophene (<bold>TBBT-V</bold>) semiconductors are facilely synthesized and fully investigated.
Large-area single-crystalline thin films of n-type organic semiconductors (OSCs) fabricated via solution-processed techniques are urgently demanded for high-end electronics. However, the lack molecular designs that concomitantly offer excellent charge-carrier transport, solution-processability, and chemical/thermal robustness OSCs limits understanding fundamental charge-transport properties impedes realization large-area The benzo[de]isoquinolino[1,8-gh]quinolinetetracarboxylic diimide...
Dimesitylcarbene (2a) was shown to decay by undergoing dimerization and have a half-life of 160 ms, some 5 orders magnitude longer-lived than diphenylcarbene. Didurylcarbene (2b) twice as long-lived 2a, while decamethyldiphenylcarbene (2c) decayed mainly unimolecularly abstracting H from the o-methyl group became shorter-lived 2b. 2,4,6-Tri(tert-butyl)diphenylcarbene (14) almost exclusively o-tert-butyl showed lifetime 125 μs. The Arrhenius plot for D abstraction 2c 14 gave data consistent...
Short period GaP/AlP superlattices are grown on GaP and GaAs substrates at 600 °C by gas source molecular beam epitaxy with growth interruption. Alternating monolayer of AlP is confirmed the observation reflection high-energy electron diffraction intensity oscillations during growth. The formation short superlattice structures zone-folded LO phonons observed in x-ray rocking curves Raman spectra, respectively.
We have developed a high resolution resist for laser thermal lithography and fabrication method this resist. designed material which has specific desired properties. aimed to raise the gasification temperature achieve sharply peaked profile so that holes are formed only in center of spot. were able perform with half pitch 40 nm. Furthermore, using result as dry etching mask, we on number materials, including SiO2 sapphire.
Variation of aggregated structures driven by side chains is a crucial issue in organic semiconductors (OSCs) for achieving high carrier mobility and device durability. In this work, phenylalkyl composed rigid terminal phenyl group flexible alkyl linker were studied based on state-of-the-art n-type π-electron system, 3,4,9,10-benzo[de]isoquinolino[1,8-gh]quinolinetetracarboxylic diimide (BQQDI), from the viewpoints thin-film transistors. An appropriate length alkyl, i.e., propyl, led to...
CW operation of a 1.60 μm GaInAsP/InP buried-heterostructure integrated laser with butt-jointed built-in distributed-Bragg-reflection waveguide (BH BJB DBR laser) was achieved at room temperature. Single longitudinal-mode fixed mode obtained in temperature range about 60 deg C, under the condition, and it also maintained rapid direct modulation 1.6 GHz.
Wavelength modulation over 500 kHz by a micromechanically tunable vertical-cavity surface-emitting laser (VCSEL) consisting of an InP-based half-VCSEL chip and micromachined silicon-on-insulator with concave movable mirror has been demonstrated for the first time. A peak power 3.5 mW, tuning range 55 nm, side-mode suppression ratio about 60 dB have demonstrated.
The cytocidal effect of HM-1 produced by Hansenula mrahii on yeast Saccharomyces cerevisiae; cells was studied. strongly inhibited the growth ofS. at a low concentration (IC50;; 2.1 × 10−8;M) reducing number viable cells. killer action most efficient when were actively proliferating. Cells in resting state resistant, but they became HM-1-sensitive after about 90 min culturing 30°C, concomitantly with increment budding index. In association reduction cell number, ultraviolet light-absorbing...
A series of polybrominated diphenylcarbenes (DPCs) are generated by irradiation the corresponding precursor diazomethanes, and their reactivities investigated means low-temperature spectroscopies as well laser flash photolysis. Triplet bis(2,4,6-tribromophenyl)carbene was shown to decay undergoing dimerization have a half-life 1 s in degassed benzene solution at room temperature, some 6 orders magnitude longer-lived than parent DPC. Anomalous effects para substituents on stability triplet...
Half a second in solution at room temperature is the lifetime of didurylcarbene (1). This species generated thermally and photochemically from corresponding diazo compound reacts by dimerization intramolecular H abstraction. The ortho methyl groups are key to stabilizing carbene, meta exert an additional buttressing effect.
Abstract Reactions of tropone derivatives and 8,8-dicyanoheptafulvene with a tautomeric mixture cycloheptatrienylidene 1,2,4,6-cycloheptatetraene afforded [4+2]-type cycloadducts.