共查询到20条相似文献,搜索用时 15 毫秒
1.
Wojciech A. Pisarski Joanna Pisarska ?ukasz Grobelny Witold Ryba-Romanowski 《Journal of luminescence》2011,131(4):649-652
Ln-doped oxychloride lead borate glasses were studied using luminescence spectroscopy. Rare earth ions were limited to trivalent Pr3+, Tm3+, Eu3+ and Er3+. Luminescence spectra were registered, which correspond to 3P0-3H4 and 1D2-3H4 transitions of Pr3+, 1G4-3H5 and 1G4-3F4 transitions of Tm3+, 5D0-7FJ (J=0, 1, 2, 3, 4) transitions of Eu3+ and 4S3/2,2H11/2-4I15/2 and 4I13/2-4I15/2 transitions of Er3+. Luminescence decays from the excited states of Ln3+ ions were analyzed in detail. The experimental results indicate that relatively high phonon energy of the host gives important contribution to the excited state relaxation of rare earth ions. 相似文献
2.
New tellurite glass series of the form (70-x)TeO2-20WO3-10Li2O-xLn2O3, where x=0, 1, 3 and 5 mol% and Ln=Nd, Sm and Er, were prepared. Density of the prepared glasses was measured and molar volume was calculated. Luminescence spectra of the prepared glasses were measured at room temperature using a micro-Raman spectrometer. The obtained luminescence intensity ratio was correlated with the rare earth ion concentration, the short distance between the identical rare earth ions r(Ln-Ln) and the glass density. Optical properties like refractive index, molar refractivity and optical polarizability were theoretically calculated in order to interpret the dependence of these properties on the rare earth ion content. 相似文献
3.
Xiaoluan Liang Chaofeng Zhu Yunxia Yang Shuanglong Yuan Guorong Chen 《Journal of luminescence》2008,128(7):1162-1164
Phosphate glasses doped with Dy3+ ions and co-doped with Dy3+–Tm3+ ions are successfully prepared in the present work. Their photoluminescence properties have been studied by absorption, excitation and emission spectra. A combination of blue and yellow emissions has emerged in the glasses, which allows the observation of white light when the glasses are excited by the ultraviolet light. The emission intensity of Dy3+ is influenced by the system ionicity, while the intensity ratio of yellow to blue emissions from Dy3+ can be tuned by varying both the concentration of Tm3+ ion and the glass matrix composition. 相似文献
4.
W.?A.?Pisarski ?.?Grobelny J.?Pisarska R.?Lisiecki G.?Dominiak-Dzik W.?Ryba-Romanowski 《Laser Physics》2010,20(3):649-655
Rare earth doped lead borate glasses and transparent glass-ceramics have been studied using optical spectroscopy. Based on
the absorption, emission and its decay and the Judd-Ofelt calculations, several radiative and laser parameters for Ln
3+ (Ln = Pr, Nd, Eu, Dy, Er, Tm) were evaluated. The large values of luminescence lifetime, quantum efficiency of excited state
and room temperature peak stimulated emission cross-section suggest efficient laser transitions of Ln
3+ ions in lead borate glasses. The obtained results indicate that lead borate glasses and glass-ceramics containing Ln
3+ ions are promising host matrices for solid-state laser applications. 相似文献
5.
M. Chandra Shekhar Reddy B. Appa Rao M. G. Brik A. Prabhakar Reddy P. Raghava Rao C. K. Jayasankar N. Veeraiah 《Applied physics. B, Lasers and optics》2012,108(2):455-461
Glasses with the composition 30PbO–25Sb2O3–(45?x)B2O3–xDy2O3 for x=0 to 1 were prepared in steps of 0.2 by the melt-quenching method. Various physical parameters, viz., density, molar volume, and oxygen packing density, were evaluated. Optical absorption and luminescence spectra of all the glasses were recorded at room temperature. From the observed absorption edges optical band gap, the Urbach energies are calculated; the optical band gap is found to decrease with the concentration of Dy2O3. The Judd–Ofelt theory was applied to characterize the absorption and luminescence spectra of Dy3+ ions in these glasses. Following the luminescence spectra, various radiative properties, like transition probability A, branching ratio β and the radiative life time τ for different emission levels of Dy3+ ions, have been evaluated. The radiative lifetime for the 4F9/2 multiplet has also been evaluated from the recorded life time decay curves, and the quantum efficiencies were estimated for all the glasses. The quantum efficiency is found to increase with the concentration of Dy2O3. 相似文献
6.
Yasser Saleh Mustafa Alajerami Suhairul Hashim Wan Muhamad Saridan Wan Hassan Ahmad Termizi Ramli Azman Kasim 《Physica B: Condensed Matter》2012,407(13):2398-2403
Several studies showed the interesting properties of trivalent lanthanide ions when doped in various types of glasses. Optical and physical properties of lithium magnesium borate glasses doped with Dy3+ then with Sm3+ ions were determined by measuring their absorption and luminescence spectra in the visible region. The absorption spectra of Dy3+ showed eight absorption bands with hypersensitive transition at 1265 nm (6H15/2→6F11/2-6H9/2) and three PL emission bands at 588 nm (4F9/2→6H15/2), 660 nm (4F9/2→6H13/2) and 775 nm (4F9/2→6H11/2). Regarding the Sm3+, nine absorption bands were observed with hypersensitive transition at 1237 nm (6H5/2–6F7/2); the PL spectrum showed four prominent peaks at 4G5/2→6H5/2 (yellow color), 4G5/2→6H7/2 (bright orange color), 4G5/2→6H9/2 (orange reddish color) and 4G5/2→6H11/2 (red color), respectively. Finally, a series of physical parameters such as the oscillator strengths, refractive index, ions concentration, Polaron radius and other parameters were calculated for each dopant. 相似文献
7.
Tb3+ ions doped and Tm/Tb/Sm co-doped glasses for light-emitting-diodes (LED) applications have been synthesized by melt quenching method. Their photoluminescence properties were studied by emission and excitation spectra. The 5D3 and 5D4 emission of Tb3+ can be varied by adjusting Tb3+ concentrations and the compositions of glass matrix. Blue, green and reddish orange emission bands were observed in the emission spectra of Tm/Tb/Sm co-doped glasses. The combination of these emission bands allows the realization of white light when the glasses are excited by near ultraviolet light. In addition, the relative intensity ratios of respective emission lines are dependent on the composition of glasses and the excitation wavelength. 相似文献
8.
G. Epurescu A. Vlad M.A. Bodea O. Dumitrescu M. Elisa J.D. Pedarnig M. Filipescu A.C. Galca M. Dinescu 《Applied Surface Science》2009,255(10):5295-5298
Thin films of complex oxides have been obtained by pulsed-laser deposition (PLD) from glass targets belonging to the system Li2O-Al2O3-P2O5-(RE)2O3, with RE = Nd, Pr, Er. The films were deposited on quartz, silicon and ITO/glass substrates using a F2 laser (λ = 157 nm, ι ≈ 20 ns) for ablation in vacuum. The structural, morphological and optical properties of the oxide films were investigated through IR and UV-VIS spectroscopy, Atomic Force Microscopy (AFM), Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy (SEM-EDX) and Spectroscopic Ellipsometry. The laser wavelength was found to be the key parameter to obtain thin films with very smooth surface. In this way new possibilities are opened to grow multilayer structures for photonic applications. 相似文献
9.
W.A. Pisarski J. Pisarska M. M?czka 《Journal of Physics and Chemistry of Solids》2006,67(12):2452-2457
New multicomponent lead borate based glasses with various PbO/B2O3 weight ratio were prepared. The glass samples were analyzed in detail by using Raman and IR absorption spectroscopy. Optical properties of Eu3+ ions have been investigated in lead borate based systems, in which PbO/B2O3 weight ratios were changed from 1:2 to 8:1 in glass composition. The values of the phonon energy of the host and 5D0 lifetime of Eu3+ decrease, whereas absorption and emission intensities, as well as bonding parameter increase with increasing PbO concentration. Additionally, spectral lines are shifted in direction to the lower frequency region. Non-monotonic dependence of the fluorescence intensity ratio R (5D0-7F2/5D0-7F1) upon PbO/B2O3 content has been observed in contrast to bonding parameter that is also non-linear but monotonic. Some structural and spectroscopic aspects for Eu-doped lead borate based glasses are presented. 相似文献
10.
Holmium doped cadmium lead borate glasses were prepared from melting in appropriate proportions of a mixture of CdO, PbO2, H3BO3 and (1–2 mol %) Ho2O3 in the temperature range of 800–850 °C. The density of glass samples was measured using Archimedes Principle. The infrared spectra of the glasses in the range of 400–4000 cm?1 showed their structure systematically. No boroxol ring formation was observed in the structure of these glasses, but the conversion of 3-fold to 4-fold coordination of boron atoms in the structure of glasses was observed. The glass transition studies were done through differential scanning calorimetry. The optical analysis is done by using the Judd–Ofelt theory. 相似文献
11.
C. Madhukar Reddy G.R. Dillip B. Deva Prasad Raju 《Journal of Physics and Chemistry of Solids》2011,72(12):1436-1441
Lead containing calcium zinc sodium fluoroborate (LCZSFB) glasses doped with different concentrations of trivalent dysprosium ions were prepared and investigated by the XRD, FTIR, optical absorption, photoluminescence and decay curve analysis. The experimentally determined oscillator strengths have been determined by measuring the areas under the absorption peaks and the Judd–Ofelt (J–O) intensity parameters were calculated using the least squares fit method. From the evaluated J–O parameters the radiative transition probability rates, radiative lifetimes and branching ratios were calculated for 4F9/2 excited level. Room temperature photoluminescence spectra for different concentrations of Dy3+-doped LCZSFB glasses were obtained by exciting the glass samples at 386 nm. The intensity of Dy3+ emission spectra increases with increasing concentration of 0.1, 0.25, 0.5 and 1.0 mol% and beyond 1.0 mol% the concentration quenching is observed. The measuring branching ratios are reasonably high for transitions 4F9/2→6H15/2 and 6H13/2, suggesting that the emission at 484 and 576 nm, respectively, can give rise to lasing action in the visible region. From the visible emission spectra, yellow–blue (Y/B) intensity ratios and chromaticity color coordinates were also estimated. The lifetimes of 4F9/2 metastable state for the samples with different concentrations were also measured and discussed. 相似文献
12.
Dysprosium ion doped fluorophosphate glasses with compositions of PKMAFDy: (56−x/2) P2O5+17K2O+8Al2O3+(15−x/2)MgO+4AlF3+xDy2O3 (x=0.01, 0.05, 0.1, 1.0 and 2.0 mol%) have been prepared by melt quenching technique and are characterized by optical absorption, emission spectra and fluorescence lifetime measurements. The observed bands in the absorption spectrum are analysed by using free-ion Hamiltonian (HFI) model. The Judd-Ofelt (JO) analysis has been performed and the intensity parameters (Ωλ, λ=2, 4, 6) have been evaluated that are used to predict radiative properties. From emission spectra, the effective bandwidth (Δλeff) and the stimulated emission cross-section (σ(λp)) were evaluated. The fluorescence decay from the 4F9/2 level of Dy3+ ions have been measured by monitoring the intense 4F9/2→6H13/2 transition (573 nm). The lifetimes (τ) are found to decrease with increasing concentration due to concentration quenching. The decay curves are single exponential for lower concentrations and gradually changes to non-exponential for higher concentrations. The non-exponential decay curves are well fitted to the Inokuti-Hirayama (IH) model for S=6 which indicates that the energy transfer between the donor and acceptor is of dipole-dipole type. The systematic analysis on decay measurements reveals that the energy transfer mechanism strongly depends on concentration as well as glass composition. 相似文献
13.
S.A. Saleem M. Jayasimhadri Kiwan Jang 《Journal of Quantitative Spectroscopy & Radiative Transfer》2011,112(1):78-84
Dy3+-doped alkali lead tellurofluoroborate (RLTB) glasses (R=Li, Na and K) were prepared by melt quenching technique. Judd-Ofelt theory has been used to evaluate the three intensity parameters Ω2, Ω4 and Ω6 from the experimental oscillator strengths. The photoluminescence spectra obtained by the excitation wavelength of 385 nm show four emission bands at 454, 483, 575 and 665 nm corresponding to the 4I15/2→6H15/2 and 4F9/2→6HJ/2 (J=15/2, 13/2 and 11/2) transitions, respectively. The laser characteristic parameters like fullwidth at half maxima (FWHM), stimulated emission cross-sections (σe), optical gain parameters (σe×τexp) and gain bandwidth parameters (σe×FWHM) were determined. From the visible emission spectra, yellow to blue (Y/B) intensity ratios and chromaticity coordinates were also estimated. The lifetimes of 4F9/2 metastable state were also measured and discussed. 相似文献
14.
Selected rockforming minerals (plagioclase, augite, olivine, ilmenite, silicate and metal phases of the meteorite “Brenham”) as well as silicate and phosphate glasses were irradiated with heavy ions (4He+, 14N+, 20Ne+, 40Ar+, 56Fe+, Xe+ nat) in the energy range of 50-130 keV in order to study ion-induced sputtering. Sputtering yields were measured independently by means of multiple beam interferometry and particle track autoradiography. The theory of sputtering by Sigmund, modified by Smith, was used to convert experimental heavy ion sputtering yields to H+- and He+-sputtering yields of the same target. Taking into account solar wind irradiation conditions at the lunar surface, an estimate of lunar erosion rates due to solar wind sputtering is given for the targets studied. 相似文献
15.
A. Thulasiramudu 《Journal of Quantitative Spectroscopy & Radiative Transfer》2006,97(2):181-194
We have developed a new series of zinc lead borate (ZLB) glasses by varying ZnO content, to enhance UV transmission, in the chemical composition of xZnO-15PbO-(85−x)B2O3, where x=0, 5, 10, 15, 20, 25, 30, 35, 40 and 45 mol% ZnO. From the measurement of UV absorption spectra both the direct and indirect band gaps have been evaluated. Also different physical properties of a reference glass of 45ZnO-15PbO-40B2O3 have been studied. From the measurement of refractive indices at six different wavelengths, Cauchy's constants (A=1.578743209; and ) have been computed and a satisfactory correlation has been achieved between the theoretical and the experimental results. Absorption spectra of Cu2+(45−x)ZnO-15PbO-40B2O3 (where x=0.1, 0.2, 0.5 and 1.0 mol%) have shown two absorption bands at 428 nm (2B1g→2Eg) and 777 nm (2B1g→2B2g). Emission spectra of (1.0 mol%) Cu2+:ZLB have revealed two emission transitions at 400 and 493 nm with excitations at 288 and 316 nm. 相似文献
16.
Glasses of the xMnO·(100−x)[yP2O5·CaO] systems, with y=1, 2, 3 and 0≤x≤50 mol% MnO were prepared and investigated by means of electron paramagnetic resonance (EPR). The local order in diamagnetic vitreous matrices could be revealed by the Mn2+ paramagnetic ions used in EPR experiments. In each systems corresponding to a particular value of y, the effect of increasing the MnO content in the samples was investigated. The structure of our glasses shows an evolution depending of MnO content from structural units involving Mn2+ ions in well defined vicinities, to structural units containing clustered manganese ions. The changes of the linewidth and the intensity of the resonance line centered at geff≈2.0 when the content of manganese ions are increasing revealed this evolution. 相似文献
17.
S.P. Feofilov D.V. Arsentyev A.B. Kulinkin R.I. Zakharchenya 《Journal of luminescence》2011,131(3):438-6358
The fluorescence spectra of nanocrystalline powder samples of Sc2O3:Ce3+ prepared by the sol-gel process were studied. The strong shift of the fluorescence spectra with the excitation wavelength was observed. The effect of the surrounding gaseous medium on 4f05d1→4f1 fluorescence of Ce3+ ions in nanoparticles, discovered earlier in YAG:Ce3+, was also observed and studied in Sc2O3:Ce3+. The fluorescence intensity and the excitation power dependence of fluorescence dramatically depend on the pressure of the gaseous media. 相似文献
18.
The Er3+/Yb3+ co-doped TeO2–TiO2–K2O glasses were prepared by conventional melting procedures, and their upconversion spectra were performed. The dependence
of luminescence intensity on the ratio of Yb3+/Er3+ was studied, and the relationship between green upconversion luminescence intensity and Er3+ concentration is discussed in detail. The 546 nm green upconversion luminescence intensity is optimised in the studied glasses
either when the Yb3+/Er3+ ratio is 25/1 and Er3+ concentration is 0.1 mol%, or when the Yb3+/Er3+ ratio is 10/1 and Er3+ concentration is 0.15 mol%. These glasses could be one of the potential candidates for LD pumping microchip solid-state lasers. 相似文献
19.
稀土硼酸盐玻璃中Ce3+的光谱性质和荧光衰减 总被引:2,自引:0,他引:2
合成Ce^3+掺杂的稀土硼酸盐玻璃,测试了材料的激发和发射光谱及荧光衰减曲线。紫外光激发下,玻璃中的Ce^3+发射强的蓝紫光,光谱的荧光寿命的分析结果表明,Ce^3+在这种稀土硼酸盐玻璃中形成两种性质不同的发光中心。 相似文献
20.
Visible optical properties of two crystalline fibers (KY3F10 and LiLuF4) doped with Dy3+ have been investigated. In particular, the room-temperature absorption spectra have been analyzed using the Judd–Ofelt theory and the intensity parameters have been obtained. A criterion suitable for determining the proper choice of the dopant composition to tailor the luminescence properties of the crystals is proposed. 相似文献