Recently, we have successfully synthesized niobium oxide nanoparticles (Nb NPs) with a particle size of less than 4 nm by DMF reduction. Nb NPs dispersed in water or alcohol showed blue-pale photoluminescence. We then fabricated organic-inorganic hybrid EL devices using Nb NPs as the emitting layer. These EL devices showed emission in a wide visible region including the red region. We found that Nb NPs have emission centers in the wide visible region and that their emission color may be controlled by the density of nanoparticles due to the Förster-type resonance energy transfer.
Luminescent Si nanocrystals were prepared from rice husks and the optical properties and structure analysis were
studied. By the transmission electron microscope observation of the Si powder from rice husks, aggregates that are
composed of Si nanoparticles with crystalline structure were confirmed. Room temperature PL with near infrared-red
regions were observed from the Si nanocrystals. From the measurements of the PL decay curves, order of the life time
were sub-micro seconds and that depended on the wavelength of the luminescence. These results indicates that the origin
of the PL from Si nanocrystals made from rice husks is quantum size effect. Preparation of luminescent Si nanocrystals
from rice husks is an effective method for recycling rice husks.
We prepare metallic tungsten oxide(WO3-x) nanoparticles by RF sputtering without doping, and investigate optical properties of the nanoparticles. Optical absorption spectra show clear two independent absorption species in near-infrared region, which are originated from localized surface plasmon resonance and polaron. This concurrent activation property not only provides a stage for understanding the fundamental physics of plasmon and polaron of tungsten oxide nanoparticles, but also shows that the nanoparticles are interesting candidates for device application.
A device to control strength of interactions between adjacent nanostructures, namely Precise Interaction Control System
for Nanostructures (PICSN) is developed. The PICSN is operated by combinations of DC motor and capacitancepositioning
sensor. In this system, nanostructures are deposited on a flexible substrate and the strength of interactions can
be controlled by changing a distance between adjacent nanostructures, stretching or shrinking the flexible substrate.
Using the PICSN, we investigate photoluminescence of Au nanoclusters (NCs), which include at least Au5, Au8 and Au13
NCs, deposited on poly(dimethylsiloxane) substrate. We observed a blue shift of PL peak position with increasing interdot
distance. Considering the relationship between absorption and emission energies of Au NCs, the blue shift is thought
to be a result of fluorescent resonant energy transfer from smaller sized Au NCs to larger ones.
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