Spectroscopic and Thermographic Qualities of Praseodymium-Doped Oxyfluorotellurite Glasses.

The thermal stability of oxyfluorotellurite glass systems, (65-x)TeO-20ZnF-12PbO-3NbO-xPrO, doped with praseodymium was examined. The different concentrations of praseodymium oxide (x = 0.5 and 2 mol%) were applied to verify the thermal, optical and luminescence properties of the materials under study.

Ultrafast photoluminescence and multiscale light amplification in nanoplasmonic cavity glass.

Interactions between plasmons and exciton nanoemitters in plexcitonic systems lead to fast and intense luminescence, desirable in optoelectonic devices, ultrafast optical switches and quantum information science. While luminescence enhancement through exciton-plasmon coupling has thus far been mostly demonstrated in micro- and nanoscale structures, analogous demonstrations in bulk materials have been largely neglected. Here we present a bulk nanocomposite glass doped with cadmium telluride quantum dots (CdTe QDs) and silver nanoparticles, nAg, which act as exciton and plasmon sources, respectively.

Exploring Structure-Sensitive Factors Relevant to Cryogenic Laser Operation in Oxide Crystals Doped with Er Ions.

Crystals of GdAlGaO:Er, (LuGd)SiO:Er and LiNbO:Er compounds differing in origin and the nature of their inherent structural disorder were crystalized. Optical absorption and luminescence spectra for transitions between the I and the I multiplets of Er ions for the crystal samples were recorded versus temperatures in the region of 80-300 K. Gathered data were analyzed thoroughly providing the in-depth knowledge of the effects of temperature on intensities, wavelengths and bandwidths of Er transitions.

Examining the Spectroscopic and Thermographic Qualities of Er-doped Oxyfluoride Germanotellurite Glasses.

Novel ternary fluoro-germano-tellurite (GTS) glasses doped with Er ions with 0.5 mol% and 1.0 mol% were fabricated by a conventional melt and quenching method and investigated using methods of optical spectroscopy.

Broadband Near-Infrared Luminescence in Lead Germanate Glass Triply Doped with Yb/Er/Tm.

This paper deals with broadband near-infrared luminescence properties of lead germanate glass triply doped with Yb/Er/Tm. Samples were excited at 800 nm and 975 nm. Their emission intensities and lifetimes depend significantly on Er and Tm concentrations.

Exploring the Impact of Structure-Sensitivity Factors on Thermographic Properties of Dy-Doped Oxide Crystals.

Optical absorption spectra and luminescence spectra were recorded as a function of temperature between 295 K and 800 K for single crystal samples of GdSiO:Dy, LuSiO:Dy, LiNbO:Dy, and GdGaAlO:Dy fabricated by the Czochralski method and of YAl(BO):Dy fabricated by the top-seeded high temperature solution method. A thermally induced change of fluorescence intensity ratio (FIR) between the I→ H and F → H emission bands of Dy was inferred from experimental data. It was found that relative thermal sensitivities S at 350 K are higher for YAl(BO):Dy and LuSiO:Dythan those for the remaining systems studied.

Phonon Sideband Analysis and Near-Infrared Emission in Heavy Metal Oxide Glasses.

In this work, spectroscopic properties of europium and erbium ions in heavy metal oxide glasses have been studied. The phonon energy of the glass host was determined based on Eu excitation spectra measurements. Near-IR emission spectra at 1550 nm related to I → I transition of erbium in heavy metal glasses were examined with special regards to luminescence bandwidth and measured lifetime.

Spectroscopy and calculations for 4f(N) → 4f(N-1)5d transitions of lanthanide ions in K3YF6.

In the present work, we report on the combined experimental and theoretical studies of the 4f-5d spectra of Ce(3+), Pr(3+), Nd(3+), Eu(3+), Gd(3+), Tb(3+), Dy(3+), and Er(3+) ions in a newly synthesized K3YF6 matrix. The low temperature experimental 4f-5d excitation spectra have been analyzed and compared with the results of the energy-level and intensity calculations. For this theoretical analysis, the extended phenomenological crystal-field model for the 4f(N-1)5d configuration (i.

Near-infrared ultrabroadband luminescence spectra properties of subvalent bismuth in CsI halide crystals.

We observed two ultrabroadband near-infrared (NIR) luminescence bands around 1.2 and 1.5 μm in as-grown bismuth-doped CsI halide crystals, without additional aftertreatment.

Effect of temperature on spectroscopic features relevant to laser performance of YVO4:Tm3+, GdVO4:Tm3+, and LuVO4:Tm3+ crystals.

Optical spectra and luminescence decay curves were measured for thulium-doped YVO(4), GdVO(4), and LuVO(4) single crystals as a function of temperature in the 300-670 K temperature region. In spite of structural similarity, the three systems studied display significantly different transition intensities and nonradiative relaxation rates. It was found, in particular, that the peak value of the pump band absorption intensity diminishes by about 30% for Tm:YVO(4) and Tm:GdVO(4), and the effective emission cross section for the laser transition of Tm(3+) diminishes by a factor of 2 roughly when temperature increases from 300 to 500 K.

Spectral characterization and laser performance of a mixed crystal Nd:(LuxY1-x)3Al5O12.

An Nd-doped Lu(1.5)Y(1.5)Al(5)O(12) (Nd:LuYAG) crystal was obtained by Czochralski method.

Estimation of low-temperature spectra behavior in Nd-doped Sc2SiO5 single crystal.

High optical quality Nd-doped Sc(2)SiO(5) crystal with size of diameter 27 mm x 60 mm was obtained by Czochralski method. An x-ray diffraction pattern of Nd:SSO crystal confirmed that the as-grown crystal was isostructual with the SSO crystal. Absorption and emission spectra were recorded at 10 K.

Effect of temperature on spectroscopic features relevant to laser performance of YVO4:Er(3+) and GdVO4:Er(3+) crystals.

Optical spectra and luminescence decay curves were measured for erbium-doped YVO(4) and GdVO(4) single crystals as a function of temperature in the 300 K-670 K temperature region. In spite of structural similarity the two systems studied display significantly different transition intensities and nonradiative relaxation rates. It was found in particular that the intensity of parasitic upconverted emission excited at 978 nm depends weakly on temperature for YVO(4):Er(3+), whereas it decreases monotonously with increasing temperature for GdVO(4):Er(3+) and becomes negligibly small at 670 K.

Unusual behavior of Tb3+ in K3YF6 green-emitting phosphor.

We report on photoluminescence studies of Tb3+ in a polycrystalline cryolite type K3YF6 host. The location of the Tb3+ in the center of inversion forbids the electric-dipole transitions of terbium ions in this material. As a consequence almost the entire luminescence intensity is related to the 5D4-(7)F5 magnetic-dipole transition, and it is contained in the extremely narrow spectral bandwidth amounting to 1.

Er-doped lead borate glasses and transparent glass ceramics for near-infrared luminescence and up-conversion applications.

Lead borate based glasses have been analyzed using Raman and infrared spectroscopy. The formation of different borate groups and the direction of BO3 <--> BO4 conversion strongly depends on the PbO- and/or PbF2-to-B2O3 ratio in chemical composition. PbF2-PbO-B2O3 based glasses containing Er3+ ions have been studied after annealing.

Electronic structure of U3+ in Cs3Lu2Cl9 and Cs3Y2I9 single crystals.

Low-temperature emission and polarized absorption spectra have been recorded for U(3+) ions diluted in Cs(3)Lu(2)Cl(9) and Cs(3)Y(2)I(9) host crystals. The experimental crystal-field levels were fitted to 13 parameters of a semiempirical Hamiltonian representing the combined atomic, one-electron crystal field (CF) as well as two-particle correlation crystal-field (CCF) operators. The red shift of the first f-d transitions from approximately 14,800 cm(-1) in the spectrum of U(3+):Cs(3)Lu(2)Cl(9) to as low as 11,790 cm(-1) in that of U(3+):Cs(3)Y(2)I(9) has been attributed to an increase in the covalence of the U(3+)-X(-) bonds.