Showing papers in "Optical Materials in 2006"

TL;DR: In this article, the room-temperature photoluminescence (PL) of copper doped zinc sulfide (ZnS:Cu) nanoparticles was investigated, with the copper concentration varying from 0 to 2 mol%.

TL;DR: In this paper, a single crystal ZnO nanorod has been prepared by hydrothermal method and the optical properties of the nanorsod were studied by annealing the nanorods at different ambiences.

TL;DR: In this article, a literature review aims to highlight recent advances in the synthesis of doped ZnS semiconductor nanoparticle materials and their wonderful properties, for example, the shift and broadening of spectrum, high luminescent quantum efficiency, shorting of emission lifetime and upconversion emission.

TL;DR: In this paper, small particles of Ti/Ni have been synthesized by a bioreduction method and the controlling parameter was the pH of the solution where they were grown in.

TL;DR: In this article, a simple soft chemical method for the synthesis of PVP-encapsulated ZnS nanoparticles and examine the optical properties of these nanoparticles with varying ageing time at the reaction temperature, concentrations of pVP and S 2� ions.

TL;DR: In this article, the room temperature photoluminescence and excitation spectra of Bi3+ in the (Y,Gd)3(Al,Ga)5O12 garnets are reported and analyzed.

TL;DR: In this paper, a simple criterion based on the optical electronegativities of the d 0 lattice cations (M n+ ) and average Pr 3+ M n+ distances is proposed to predict 3 P 0 quenching in these lattices.

TL;DR: In this paper, the room-temperature vibrational spectra of the monazite-type rare-earth orthophosphates (RPO4, R = La, Ce, Pr, Nd, Sm, Eu and Gd) have been investigated using polarized Raman and infrared spectroscopies.

TL;DR: In this paper, the effect of Er 3+ concentration on the quantum efficiency was discussed in terms of the cluster formation of the active ion and by the dynamics change induced by the presence of Yb 3+.

TL;DR: In this paper, a low-temperature hydrothermal technique was used to grow ZnO nanostructures with different morphologies and they were studied by Raman and photoluminescence spectroscopy techniques.

TL;DR: In this paper, X-ray diffraction measurements showed that monoclinic gallium oxide thin films were formed by pulsed spray pyrolysis in air using ethanol solution of gallium trichloride as precursor.

TL;DR: In this article, thin films of phthalocyanine and its complexes [magnesium, manganese, iron, cobalt, zinc, lead and zinc and lead] have been prepared by vacuum evaporation technique.

TL;DR: In this article, the authors obtained Au and Ag nanoparticles precipitated in glasses by irradiation of focused femtosecond pulses, and investigated the nonlinear absorptions of the glasses by using Z-scan technique with ns pulses at 532 nm.

TL;DR: In this paper, the absorption and fluorescence spectra, as well as fluorescence decay kinetics of Yb3+ ion in disordered scheelite-like double molybdates Yb:NaGd(MoO4)2, grown by Czochralski, have been investigated.

TL;DR: In this article, the authors review spectroscopic and scintillator characterization of new complex oxide crystals, namely LSO, LYSO, YAG, LuAP (LuAlO 3, lutetium aluminate perovskite) and LuYAP activated with Ce and Pr.

TL;DR: In this article, a precipitation process for synthesizing nanocrystalline yttria powder and sintering transparent Y 2 O 3 ceramics was described, and the results showed that normal striking derived ytria powders have higher sinterability than reverse striking derived powders.

TL;DR: In this paper, an improved procedure for calculating the optical parameters from the measurements data is described, where the relationship between the optical path in the plane-parallel film and the position of extrema in the transmission spectra is verified by reflection measurements on freestanding samples.

TL;DR: In this paper, the authors provide a detailed description of the preparation and characterization of diffusion-doped Cr2+:ZnSe and Fe2+-ZnSE samples with peak absorption coefficients as high as 74 cm−1 and fairly good spatial uniformity.

TL;DR: In this paper, a nearly stoichiometric SnS films with the composition of Sn 0.99 S 1.01 S 0. 99 were synthesized at −0.72 to − 0.75 V and the bath temperature varied from 30 to 50°C, and they were polycrystalline with orthorhombic structure.

TL;DR: In this article, the optical properties of the host (the transparency window, the orientation of the principal optical axes and the measurement of the refractive indices as a function of the wavelength) were studied in terms of the optical absorption at room temperature (RT) and at low temperature (6-K).

TL;DR: In this article, stress-induced mechanoluminescence (ML) in persistent phosphor, SAO:ED, was investigated under various loading and unloading conditions, and it was found that the ML signals could be only produced by dynamic stress, but not by static stress.

TL;DR: In this article, the photoluminescence of rare-earth (Sm, Eu, Tb) ions in HfO 2 thin films has been investigated at 10 and 300 K.

TL;DR: In this article, Dy3+-doped YPO4 nanocrystals were synthesized by combustion method with urea as a fuel calcined at 600°C and the as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron micrograph (TEM) and photoluminescence (PL) spectroscopy.

TL;DR: In this article, single crystals of Yb3+-doped monoclinic potassium lutetium tungstate were grown with several dopant concentrations (0.5%, 5% and 10% in the solution).

TL;DR: A brief overview of the recent progress in white organic light emitting diodes (WOLEDs) that are considered to be the low-cost alternatives for solid-state illumination purposes is provided in this article.

TL;DR: In this paper, the authors employed a modified four-layer medium transmission model to extract the thickness, wavelength-dependent refractive index, band gap and band tail of highly ordered porous alumina membranes (PAMs) anodized in oxalic acid, from visible and ultraviolet optical transmission spectra.

TL;DR: In this paper, it has been shown that the traps of the material play a crucial role in the fluorescence properties due to the fact that autoionization process is likely when dopant ions absorb high energy photons.

TL;DR: ZrO2 nanocrystals were synthesized by combustion process at a relatively low temperature and upon introducing calcium ions into the host, the monoclinic to tetragonal and cubic transformation was observed as discussed by the authors.

TL;DR: In this article, X-ray diffraction results showed polycrystalline wurtzite with a preferential (0-0-2) orientation. And the ultraviolet emission results from the recombination of free exciton with stronger longitudinal optical phonon replica may be ascribed to the strong interaction between the exciton and LO phonon in nanostructure.

TL;DR: In this article, the energy transfer from Pr 3+ to Eu 3+ and Mn 2+ was investigated and it was shown that the energy transferred from Pr 2+ to Mn 3+ can achieve an energy transfer rate of 0.26 ms −1.