Showing papers in "Journal of Luminescence in 1999"

TL;DR: In this paper, the effect of composition on the afterglow phosphorescence from BaAl 2 O 4 : Eu 2+, Dy 3+ crystals has been evaluated using crystals grown by the floating zone technique.

TL;DR: In this article, the optical and scintillation properties of a pure and a Ce3+-doped Cs2LiYCl6 crystal and a Li3YCl 6:Ce3+ crystal were studied with the aim of finding a new thermal-neutron scintillator.

TL;DR: In this paper, it was shown that two photons can be emitted due to 5 D J → 7 F J transitions on two Eu3+ ions, and that this two-step energy transfer process is very efficient at room temperature.

TL;DR: In this article, the optical and scintillation properties of LaCl3, LuBr3, and LuCl3 were studied under optical, X-and γ-ray excitation.

TL;DR: In this article, the concept of tailored interfaces has been applied to the synthesis of Eu 2 O 3 /Y 2 O3 powders to achieve a narrow size distribution by using a modifier.

TL;DR: In this article, the optical spectra and lifetimes of nanocrystalline Eu3+Y2O3 as a function of particle diameter from 15 to 7nm were reported.

TL;DR: The photophysical properties of a series of mononuclear Eu-containing 1-1 nitrato complexes and 1-3 triple-helical complexes with terpyridine, [Eu(tpy)3]3+, and 2,6-bis(1'-methylbenzimidazol-2'-yl)pyrididine, were investigated with the aim of unravelling the respective influence of the ligand-to-metal charge transfer state (LMCT) and π-π interactions between the ligands strands in the large quen

TL;DR: In this paper, the time-resolved luminescence of the Eu3+ ion in calcium hydroxyapatite Ca5(PO4)3OH prepared by a precipitation reaction is reported.

TL;DR: The photoluminescence and the excitation spectra of Bi3+ in the pyrochlore La2Zr2O7 have been investigated in the temperature range of 15-300 K.

TL;DR: In this paper, the steady-state fluorescence quenching of 2,6-bis(diethanolamino)-4,8-dipiperidino-pyrimido [5,4-d]pyrimidine (dipyridamole) by a stable nitroxyl radical 2,2,6, 6-tetramethyl-piperidine-Noxyl (TEMPO) was used to clear up the influence of the quencher light absorption on the values of the Stern-Volmer quen

TL;DR: In this article, a new luminescence dating method based on radioluminescence measurements of potassium feldspar was proposed, where the light emitting transition of electrons from the conduction band into an optically sensitive electron trap was investigated for the first time.

TL;DR: In this paper, the authors investigate how the size restricted geometry of the nanoparticle influences electronic relaxation by the one-phonon emission process and optical dephasing by the two phonon Raman process.

TL;DR: In this paper, the as-deposited SrAl2O4:Eu films did not show any peaks in the X-ray diffraction spectra, and the photoluminescence (PL) was not observed.

TL;DR: In this article, the decay time of Eu3 ion codoped with other rare-earth ions (Nd3,S m 3,D y 3,E r 3, and Yb3) was measured at temperatures between 10 and 300 K in order to investigate the excitation energy transfer processes in the nanostructured xerogel and annealed sol}gel silica glasses.

TL;DR: In this paper, two models are proposed to explain the energy transfer from the host lattice to the Ce ions in K2LaCl5:Ce3+ with Ce3+ concentrations between 0.001% and 10% are presented.

TL;DR: In this article, the authors investigated the photoluminescence of CaS:Dy and Ca 1−x La x S : Dy prepared in Na 2 CO 3 -S and K 2 CO3 -S flux.

TL;DR: In this paper, an organic electroluminescenters with Eu x Tb 1−x (aca) 3 phen dinuclear complex as the emitting layer were fabricated and when operated under proper voltage the white light can be obtained.

TL;DR: In this article, a Tm, Dy: BaY2F8 crystal is studied in order to develop a solid state laser device pumped by a diode laser, where the authors measured the lifetime and deduced the emission cross-section of the 6 H 13/2 → 6 H 15/2 Dy transition in the 3μm wavelength region.

TL;DR: In this paper, a photo-pulse stimulation technique was used to release the stored photo energy from trapped Eu2+ ions in SrAl2O4:Eu,Dy single crystal fibers at 80 K.

TL;DR: The photophysical properties of the dyes in solution and in film have been investigated by steady-state and time-resolved fluorescence spectroscopy as mentioned in this paper, leading to a very broad color emission by the ternary system when excited with ultraviolet light.

TL;DR: In this paper, the absorption and luminescence properties of Er3+ ions doped into single crystals of the tetragonal-symmetry host LuPO4 are reported, and the fluorescence decay of the 4 I 13/2 − 4 I 15/2 emission was found to be governed by a single exponential decay process when excited with a low-intensity pump source.

TL;DR: In this article, the excitonic magnetic polaron formation accompanied with emission or absorption of LO phonons was also observed in the quantum wires of diluted magnetic semiconductors by time-resolved photoluminescence spectroscopy.

TL;DR: In this paper, the spin-orbit contribution of hole burning and magnetic circular dichroism observations on the fine structure of the excited 3 E state in the nitrogen-vacancy center of diamond was analyzed.

TL;DR: In this article, the Eu3+ time-resolved luminescence in strontium hydroxyapatite Sr10(PO4)6(OH)2 prepared by solid-state reaction is studied at 20 K. The emission mainly arises from the 5 D 0 level.

TL;DR: In this article, a series of photoluminescent properties of some new indolizinic compounds, recently synthesized, derivatives from bipyridyl, are analyzed, and significant differences are observed between monoindolizinic compounds and bisindolinear ones regarding the absorption and fluorescence in the UV-VIS spectral range.

TL;DR: In this paper, the authors synthesized green and red luminescent silicon nanocrystals in a SiO 2 matrix by RF co-sputtering on a quartz substrate, and the transmission coefficient measurements were used to estimate the nanocrystal size distribution.

TL;DR: In this article, the mechanisms of creation of the stable color centers generated in GGG-Nd crystals under the influence of UV light and various kind of ionizing radiation (gamma-rays and electrons) are examined.

TL;DR: In this article, the authors show how stress changes during the annealing process can be used to develop a model that explains the origin of emission lines at 3.2898 and 3.2176 eV.

TL;DR: Violet-blue photoluminescent emission has been observed in aluminium oxide films deposited by the ultrasonic spray pyrolysis process at atmospheric pressure, using solutions of 0.05 M aluminium acetylacetonate in a mixture of two parts of deionised water and two parts in methanol and aluminium chloride in the same solvent mixture as discussed by the authors.

TL;DR: In this paper, the absolute energy level structure of the ions with respect to the intrinsic bands of the host can be determined by comparing the optical spectra of these materials with complementary measurements such as photoconductivity.