Field emitters can be used as a cathode electrode in a cathodoluminescence device, and single-walled carbon nanotubes (SWCNTs) that are synthesized by arc discharge are expected to exhibit good field emission (FE) properties. However, a cathodoluminescence device that uses field emitters radiates rays whose intensity considerably fluctuates at a low frequency, and the radiant fluctuation is cau...

The degree of polarization (DOP) of luminescence of III-V materials is a sensitive function of the strain in the material. The DOP can be measured with a spatial resolution of roughly 1 μm and an rms noise equivalent to a strain difference of 2H10. The DOP can be measured on cleaved facets, surfaces free of metals, or luminescent layers buried by transparent materials or thin films. Thus maps o...

"Reports" are full fledged scientific papers, often accompanied by a transscript of the discussion that came after their presentation. However, these are followed by "Communications" that range in length from three sentences to nearly six pages in content (and on page 17 is a note that one paper was not received at all). To compound the problem, the shorter "Communications" are printed on only ...

The use of low-background liquid scintillation counting (ISC) techniques permits the simultaneous measurement of both alpha and beta emitters with efficiencies close to 100%. In this study, the counting parameters of a Wallac 1220TM Quantulus IS counter have been optimized for the best possible separation of the a and 3 spectra when measuring a sample containing 8 ml of water and 12 ml of Optip...

We investigate the effect of peculiar velocities on the redshift space distribution of z >∼ 2 galaxies, and we focus in particular on Lyα emitters. We generate catalogues of dark matter (DM) halos and identify emitters with halos of the same comoving space density (M(Lyα emitters) ≈ 3× 1011M⊙). We decompose the peculiar velocity field of halos into streaming, gradient and random components, and...

Recently developed all-organic emitters used in display applications achieve high brightness by harvesting triplet populations via thermally activated delayed fluorescence. The photophysical properties of these emitters therefore involve new inherent complexities and are strongly affected by interactions with their host material in the solid state. Ensemble measurements occlude the molecular de...

Carbon nanotube (CNT) field emitters that exhibit extremely high stability against high-voltage arcing have been demonstrated. The CNT emitters were fabricated on a sharp copper tip substrate that produces a high electric field. A metal mixture composed of silver, copper, and indium micro- and nanoparticles was used as a binder to attach CNTs to the substrate. Due to the strong adhesion of the ...

We report a single molecule detection scheme to investigate excitation spectra of single emitters at room temperature. We demonstrate the potential of single emitter photoluminescence excitation spectroscopy by recording excitation spectra of single CdSe nanocrystals over a wide spectral range of 100 nm. The spectra exhibit emission intermittency, characteristic of single emitters. We observe l...

In France as well as in other countries, some facilities that hosted nuclear researches must be demolished because safety standards have changed. In that context, radioactive waste management is a challenging task faced by existing nuclear power countries. Therefore, characterization is essential to classify wastes and to reduce costs. In many facilities, after the removal of glove boxes, fume ...