Here we report on the visible luminescence of single gold nanospherical particles diffusing in water excited by a pulsed-laser at 488 nm. The signal studied by fluorescence correlation spectroscopy does not display the expected characteristics. The main deviation is obtained for the diffusion time that depends on the laser irradiance. Additional advanced methods of measurements have been implem...

Europium speciation is investigated by time-resolved luminescence spectroscopy (TRLS) in the presence of Suwannee River fulvic acid (SRFA). From complexation isotherms built at different total Eu(III) concentrations, pH values, ionic strength, and SRFA concentrations, it appears that two luminescence behaviors of Eu(III) are occurring. The first part, at the lowest CSRFA values, is showing the ...

We studied the possible correlations between defects and photoluminescence spectra in ZnO nanoparticles of sizes ranging from 43 nm to 73 nm in diameter. The defects and impurity contents were characterized by Fourier-transform infrared (FTIR) spectroscopy. The results show fewer carboxylate and hydroxyl impurities for particles of larger sizes. No significant variation in oxygen vacancy conten...

The physical state of silica is a very useful index of shock in meteorites. Its study has been revived by the discovery of high pressure silica in Shergotty of the αPbO2 and ZrO2 structure [14]. Shergottites usually contain a few percent of silica with varied textures depending on their location in the rock. Cathodoluminescence (CL) imaging and spectroscopy is a powerful technique which enables...

Using sensitized Tb(3+) luminescence spectroscopy as a tool, binding of 14 lanthanides to a lanthanide-dependent DNAzyme is studied, where the binding affinity is symmetric across the series and the tightest binding occurs with Nd(3+) and Ho(3+). This trend does not correlate with DNAzyme activity, suggesting that metal binding may not be the rate-limiting step of the DNAzyme catalysis.

A new chiral diketonate ligand based on carvone binds early lanthanides. The Eu complex displays high circularly polarized (g(lum) = 0.82) red luminescence under near-UV excitation in the solid state. This is the first report on such CPL activity in the solid state with a rigorous protocol to exclude artifacts. Paramagnetic NMR spectroscopy revealed the nature and structure of the active species.

2014 We report the results of Zeeman spectroscopy of the zero-phonon luminescence at 0.74 eV from GaAs : V. They are interpreted in terms of a 3T2 ~ 3A2 transition within a V3+(3d2) ion. Such a model was introduced by Skolnick et al. in their study of InP : V. J. Physique 45 (1984) 1795-1800 NOVEMBRE 1984, Classification Physics Abstracts 71.55 78.55

Manganese doped nanocrystalline willemite powder phosphors Zn(2-x)Mn(x)SiO(4) (0.1<or=x<or=0.5) have been synthesized by a low-temperature initiated, self-propagating, gas producing solution combustion process. The phosphors have been characterized by using x-ray diffraction (XRD), energy dispersive spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), elec...

In-vivo two-photon imaging of intrinsic fluorescence allows metabolic function to be evaluated on a cellular level. A method of validating, identifying and separating the fluorophores present in an in-vivo two-photon image is described. ©2008 Optical Society of America OCIS codes: (170.0170) Medical optics and biotechnology; (110.4234) Multispectral and hyperspectral imaging; (170.2655) Functio...

Morphology and photoluminescence (PL) properties for microcrystalline cellulose (MCC), microcrystalline nitrite powders of common formulae MNO2 (M=Na, K) (MCN) and two-component materials composed of both MCC and MCN have been prepared and characterized by means of optical microscopy and luminescence spectroscopy. This study aimed to clarify a possibility of low-limit determination of the nitri...