Showing papers in "Journal of Luminescence in 1984"

TL;DR: In this article, the position of the d-band edge (E) in energy for rare earth ions that fluoresce with broad emission bands is known to be sensitive to electron-electron repulsion between the active cation and its surrounding anions.

TL;DR: In BaFX:Eu 2+, the excitation by X-ray or ultraviolet light and the photostimulation of luminescence by visible light are caused by the processes of Eu 2 + ⇌Eu 3+ and F + -centers⇌F.

TL;DR: In this paper, the authors investigated the luminescence of 7-azaindole (7AI) in non-polar solvents and alcohols with respect to its dependence upon temperature, concentration, and excitation energy.

TL;DR: In this article, small crystallites of the direct gap, CdS and ZnS are synthesized, and stablized against aggregation and sedimentation, using colloidal chemical techniques in liquids (water, methanol, and acetonitrile).

TL;DR: In this paper, a survey on the laser relevant spectroscopic properties of Cr3+ and Mn doped garnets and tungstates is given, where the energy level schemes of the active ions are derived from absorption, fluorescence, excitation and lifetime measurements between 4K and 300K.

TL;DR: In this paper, it was shown that in these compounds energy migration to quenching centres occurs down to the lowest temperatures if x > 0.3. And the characteristics of the energy migration processes can be explained using a two-dimensional diffusion model.

TL;DR: In this article, the authors measured the time-resolved fluorescence decay of the Jaggregate of the title dye with a jitter-free picosecond streak camera and by time-correlated single photon counting.

TL;DR: In this article, the blue shift of the Z3 and Z1,2 exciton bands and the increase of spin-orbit splitting energy of the top valence bands with the decrease of the CuCl crystal size were found.

TL;DR: In this paper, the optical properties of Tm3+ in a fluorophosphate glass were reported and Oscillator strengths and Ωλ parameters for Tm 3+ were calculated.

TL;DR: Powdered samples of Cs2ZrCl6 and cs2HfCl6 are efficient X-ray phosphors with broad-band emission in the blue region.

TL;DR: In this article, the luminescence properties of manganese(II) phosphates prepared by thermal dehydration of Mn(H 2 PO 4 ) 2 ·2H 2 O have been studied.

TL;DR: In this article, the absorption and luminescence of LiGa 5 O 8 :Co are studied at various temperatures between liquid helium temperature and 500K. The spectra are assigned to transitions on Co 2+ ions in tetrahedral sites.

TL;DR: In this paper, the Fourier transformation of quantum beat free induction decay is used for obtaining sub-level spectra of spin levels in solids, which is a powerful optical technique for obtaining spin levels.

TL;DR: The luminescence of Bi3+ in the host lattices LnBO3 depends strongly on the nature of the Ln3+ ion as mentioned in this paper, and the Stokes shift increases from 0.22 eV to 1.16 eV for LaBO3-Bi.

TL;DR: In this article, the ionization energies for the donors and acceptors participating in the formation of DAP were calculated and the fine structure of emission due to the annihilation of excitons bound on acceptor pairs (band maximum 4075 A) was detected and calculated.

TL;DR: In this paper, the authors measured the absorption and fluorescence properties of the high lying (4f 2 ) 1 S 0 state of Pr 3+ in several crystal hosts through a one photon absorption into the nearby 4f5d band and through a two photon excited state absorption from the intermediate 1 D 2 level into the 1S 0 state.

TL;DR: In this article, an unconventional method for quantum yield measurements is described and applied to determine the quantum yield of fluorescence from 3P1, 3P0 and 1D2 levels of Pr3+ ions in (Pr,La)P5O14 under selective excitation of the levels.

TL;DR: Explication de la luminescence de Mn 2+ dans la calcite naturelle recemment rapportee as discussed by the authors, en particulier, de la bande d'emission UV attribuee a Mn 2+, et qui serait en fait due a Ce 3+

TL;DR: In this article, the steady state and time resolved photoluminescence properties of amorphous alloy films of a-SiOx:H, aSiNx:H and a-SixC1-x :H were studied.

TL;DR: Ba2WO3F4 is an efficient luminescent material under UV and X-ray excitation and its luminescence properties show a similarity with those of the tungstates, especially MgWO4 as mentioned in this paper.

TL;DR: In this paper, a scheme of Stark split energy levels and radiative transitions was built to determine the intensity and power of emission lines, branching ratios, absorption and emission cross sections, transition probabilities and oscillator strengths.

TL;DR: In this article, the Fe2+ level fine-structure on the 3T1(H) → 5E(D) spin-reversal transitions of ZnS and ZnSe is discussed.

TL;DR: In this paper, the authors measured the lifetime and quantum yields for fluorescence as a function of solvent and the results demonstrate the unique nature of the photophysics in this system.

TL;DR: In this paper, a method of taking into account intrinsic traps of singlet excitons (excimer forming sites, EFS), ordinarily present in an impurity free polymer macromolecule, has been elaborated.

TL;DR: Fluorescein in boric acid glass has an extremely low saturation intensity measured in saturated absorption and phase conjugation experiments to be of the order of 10 mW cm 2.

TL;DR: The first values of absolute triboluminescence intensity, in units of photons/mol, were reported for molecular crystals and salts in this paper, ranging from 5 × 1016 photons/m for cholesteryl salicylate to 6.2 × 1010 photons /m for magnesium sulfate.

TL;DR: In this article, the decay processes of infrared emissions due to internal transitions after above gap laser excitation have been studied for the first time for several III-V semiconductors (GaAs, GaP, InP) doped with 3d ions (V, Cr, Fe and Co).

TL;DR: In this paper, a conversion of infrared radiation into green fluorescence of Er + 3 in centrosymmetric Cs 2 Na(Er 0.2 Yb 0.4 Y 0 4 )Cl 6 crystals is examined and interpreted on the basis of stepwise energy transfer mechanism.