A5028333421- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Photochemistry and Electron Transfer Studies
- Synthesis and characterization of novel inorganic/organometallic compounds
- Molecular Junctions and Nanostructures
- Conducting polymers and applications
- Calibration and Measurement Techniques
- Luminescence and Fluorescent Materials
- Organoboron and organosilicon chemistry
- Photonic Crystals and Applications
- Spectroscopy and Quantum Chemical Studies
- bioluminescence and chemiluminescence research
- Sensor Technology and Measurement Systems
- Infrared Target Detection Methodologies
- Atmospheric Ozone and Climate
- Scientific Measurement and Uncertainty Evaluation
- Photonic and Optical Devices
- Glass properties and applications
- Spectroscopy and Laser Applications
- Advanced Fiber Optic Sensors
- Transition Metal Oxide Nanomaterials
- Induction Heating and Inverter Technology
- Organometallic Complex Synthesis and Catalysis
- Silicone and Siloxane Chemistry
- Surface Chemistry and Catalysis
National Institute of Advanced Industrial Science and Technology
2002-2023
Japan Advanced Institute of Science and Technology
2011
National Institute for Materials Science
1999-2001
Osaka University
1994-2000
Quantum yields of firefly bioluminescence reactions were determined for beetle luciferases from the three main families luminous beetles emitting different colors. yield (QY) was significantly correlated with luminescence spectrum. The green light-emitting luciferase Brazilian click beetle, Pyrearinus termitilluminans, whose spectrum had shortest peak wavelength all investigated, highest QY (0.61). Mutant analyses active site-substituted Pyrocoelia miyako showed that, although k(cat)...
A photoresponsive organic light-emitting device combining blue-emitting electroluminescent (EL) diode with titanyl phthalocyanine as a near-infrared (IR) sensitive layer was fabricated. By irradiating near-IR light to the device, blue emission occurred in lower drive voltage (between 5 and 12 V). The result indicates that acts switch and/or an up-converter from (1.6 eV) (2.6 eV). EL response times of rise decay using trigger were 260 330 μs, respectively. At higher (above V), enhancement...
Spectroscopic features of various thiophene/phenylene co-oligomers with molecular sizes and shapes have been investigated in the form thin films. Of these compounds, shorter oligomers assume vertical alignment more readily than longer oligomers. The latter oligomers, however, tend to exhibit when deposited under a high vacuum at small deposition rate. films this were examined by θ−2θ X-ray diffraction incident-angle-dependent polarized absorption spectroscopy. A sharpened spectral line...
An organic light-emitting diode containing titanyl phthalocyanine (TiOPc) and tris-(8-hydroxy quinoline) aluminum (Alq 3 ) layers has been fabricated. The device exhibits green emission from the Alq emissive layer under ambient conditions. Below turn-on voltage, is instantaneously switched on by laser irradiation at 650 nm, indicating that can be used as a red-to-green light converter. Above greatly enhanced irradiation, while current-voltage characteristics are significantly modified....
Abstract Quantum yields of firefly bioluminescence reactions were determined using a commercially available luminometer whose absolute responsivity was calibrated with respect to the spatially and spectrally integrated photon flux emitted from reaction solution.
In response to the strong demand for a total spectral radiant flux (TSRF) standard from domestic lighting manufacturers, such scale has been realized in visible range by means of relative gonio-spectroradiometric method at National Metrology Institute Japan (NMIJ). Our employs irradiance as well luminous intensity reference standards. We have investigated several models quartz-halogen lamps manufacturers with respect their stability and decided set TSRF. carefully selected sufficient lamp...
Porous nickel-phosphorus (NiP) black surfaces exhibit excellent low reflectance in the visible and near-IR regions. Through use of a model surface morphology composition, was numerically simulated by three-dimensional finite-difference time-domain method to determine origin reflectance. In agreement with experimental results, simulations showed spectrally flat, quite <0.1% over entire visible-near-IR region under certain conditions. The depended strongly on thickness nickel oxide layer...
We have developed a polarization-independent reflection-type silicon photodiode trap detector and characterized its performance by laser beam-based measurement. Three dimensional CAD-based modeling enables us to optimize interior design, resulting in minimizing each distance between centers of adjacent photodiodes rotating 45° along normal axis. It is expected simple ray-tracing simulation also confirmed experimentally that the incorporating with large active area exhibits largest acceptance...
The APMP.PR-S4 comparison of fiber optic power responsivity and nonlinearity at 1550 nm, from 1?mW to 250?mW, was carried out. In total three institutes participated: NMIJ (Japan), PTB (Germany) NPL (United Kingdom). measurements started in December 2008 ended 2009. For responsivity, all participants reported their results were used for the intercomparison: no measurement subject rejection. two results, therefore only a bilateral performed. analysis method out according Guidelines CCPR...
Linear oligosilanes (R(SiR2)10R), permethyldecasilane (R = CH3), and perpropyldecasilane C3H7), were vacuum-deposited onto quartz substrates under various conditions. Molecular orientation in the deposited thin films was investigated by X-ray diffractometry absorption spectroscopy with a varying incident angle to substrate. Two types of highly ordered multilayered structures, one molecular normal substrate other oblique orientation, observed at room temperature. When −150 °C, on hand,...
Abstract Dispersion of silver nanoparticles was prepared from n-tetradecanoate via thermal decomposition. The absorption spectrum the dispersion showed a broad band at ca. 420 nm, characteristic plasmon in nanoparticles. On other hand, nanoparticle monolayers both on water and quartz had an 470 which coincided with position reflection bands. Surface reflectance toluene also peak wavelength nm.
In order to understand the relationship between molecular orientation and optical properties of oligophenylenevinylene film, oriented thin films 1,4-di(p-methoxystyryl)benzene (DSB-1) 1,4-di(p-methoxystyryl)-2,5-dimethoxybenzene (DSB-2) were fabricated on a potassium bromide (KBr) (001) surface by vacuum-evaporation method. The structures DSB have been investigated transmission electron microscopy (TEM), atomic force (AFM) polarized photoluminescence (PL) spectroscopy, respectively. DSB-1...
Thin films of permethyloligosilanes with phenyl end groups, Ph(SiMe 2 ) n Ph ( = 10, 12), were prepared by vacuum deposition at various temperatures. The deposited thin investigated X-ray diffractometry in terms multilayered structures and varying incident-angle absorption spectroscopy their molecular orientations. interlayer spacings the are reasonably well explained assuming interdigitated molecules oriented normal to substrates. When onto cold substrates, another structure appeared, which...