Optical Properties Of Sm3 Research Articles

Composition dependent structural and optical properties of Sm 3+ doped boro-tellurite glasses

Boro-tellurite glasses with the composition (69– x)H 3BO 3+ xTeO 2+15MgCO 3+15K 2CO 3+1Sm 2O 3 (where x=0, 10, 20, 30 and 40 wt%) doped with trivalent samarium have been prepared and their structural and spectroscopic behavior were studied and reported. The FTIR spectra reveal the presence of BO 3 and BO 4 non-bridging oxygen as well as strong OH − bonds in the prepared glasses. Through the optical absorption spectra, Judd–Ofelt intensity parameters ( Ω λ , λ=2, 4 and 6) have been evaluated and the same is in turn used to predict radiative properties such as radiative transition probability ( A), stimulated emission cross-section ( σ P E ) and branching ratios ( β R) for the excited levels of Sm 3+ ions corresponding to 4G 5/2→ 6H 5/2, 4G 5/2→ 6H 7/2, 4G 5/2→ 6H 9/2 and 4G 5/2→ 6H 11/2 transitions. Structural and spectral dependence of the Sm 3+ ions due to the compositional changes have been examined and reported. The lifetime of the 4G 5/2 level is found to be non-exponential for all the prepared glasses indicating a cross-relaxation among the Sm 3+ ions. The structural and spectroscopic results corresponding to compositional changes have been compared with the similar studies and reported.

Spectroscopic Investigations of Sm3+ Ions Doped B2O3-Bi2O3-ZnO-Li2O Glasses

This article reports on the preparation and optical properties of Sm3+ ions doped B2O3-Bi2O3-ZnO-Li2O (ZLiBiB) glasses. The optical absorption spectra, luminescence spectra and decay curves were measured. On the basis of Judd-Ofelt theory, the intensity parameters Ωλ (λ = 2, 4, 6) and also oscillatory strengths are obtained from the absorption spectra and these results were used to compute the radiative properties of Sm3+: ZLiBiB glasses. Especially the luminescence concentration quenching and the related mechanism were analysed systematically.

Microstructure and Optical Properties of Sm3+ Doped TiO2 Thin Films by Oblique Angle Deposition

TiO2: 2%Sm3+ thin films were prepared by oblique angle deposition. X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis-NIR spectrophotometer, fluorescence spectrophotometer was employed to characterize the structure and optical properties of TiO2: 2%Sm3+ thin films. The results indicated that these thin films were with anisotropic columnar structure before and after calcination. The optical anisotropy measured by transmission difference (Tp-Ts) at 500nm was increasing from 8% to 33% with calcination. Under ultraviolet excitation (λex = 330nm) and commercial 365nm UV lamp excitation, these TiO2: Sm3+ thin films show intense 4G5/2→ 6H5/2, 7/2, 9/2 emissions of Sm3+. The polarized photoluminescence was anticipated in the anisotropic thin films.

Composition dependent structural and optical properties of Sm 3+-doped sodium borate and sodium fluoroborate glasses

Sodium borate and fluoroborate glasses doped with trivalent samarium (Sm 3+) were prepared and their detailed spectroscopic analysis was carried out. The FTIR spectra reveal that, the glasses contain BO 3, BO 4, non-bridging oxygen and strong OH − bonds. From the optical absorption spectra, Judd–Ofelt intensity parameters ( Ω λ , λ=2, 4 and 6) have been evaluated and are in turn used to predict radiative properties such as radiative transition probability ( A), stimulated emission cross section ( σ P E ) and branching ratios ( β R) for the excited levels of Sm 3+ ions in sodium borate and sodium fluoroborate glasses. The dependence of the spectral characteristics of Sm 3+ ions due to compositional changes have been examined and reported. The value is found to decrease with the decrease in the sodium content in the glass. The decay from the 4G 5/2 level is found to be non-exponential indicating a cross-relaxation among the Sm 3+ ions.

Structural and optical properties of Sm(DBM) 3Phen doped in poly(methyl methacrylate) (PMMA): An evidence for cascading energy transfer process

Sm(DBM) 3Phen complexes have been synthesized and studied in detail. X-ray diffraction analysis of Sm(DBM) 3Phen complex reveals crystalline behavior. An enhancement in the fluorescence intensity as compared to the Sm(Phen) 3·2H 2O and Sm(DBM) 3·2H 2O samples has been observed. Stark splitting of the Sm 3+ emission bands has also been observed. The fluorescence decay time for Sm 3+ ( 4G 5/2 → 6H 9/2 transition) is seen to increase from 221.6 μs in Sm 3+ to 232.6 μs in presence of Sm(DBM) 3·2H 2O and to 260.6 μs in Sm(DBM) 3Phen. Energy transfer from excited Phen to DBM and finally from DBM to Sm 3+ is proposed as the cause of the above observations.

Optical properties of Sm 3+-doped CaF 2 bismuth borate glasses

Sm 3+-doped calcium fluoride bismuth borate glasses were prepared and characterized optically and the oscillator strengths and Judd–Ofelt parameters for the glass containing 1.5 mol% of Sm 2O 3 were calculated. Density and optical absorption, transmission and the emission spectra were measured. The values of Judd–Ofelt parameters suggested an increase in the degree of asymmetry the local ligand field at Sm 3+ sites. The optical band gap energy, band tailing parameter and Urbach's energy were calculated for all glass samples. It was found that with increasing the concentration of Sm 2O 3 content the values of the optical band gap energy decrease whereas Urbach's energy increases. Absorption and excitation spectra indicate that commercial UV and blue laser diodes, blue and bluish-green LEDs and Ar + optical laser are powerful excitation sources for Sm 3+ visible fluorescence in the glass.

Optical properties of Sm3+ ions and influence of odd third‐order intensity parameters in fluoride glasses

AbstractFluoride glasses in the following compositions (39‐x)InF3‐20ZnF2‐20SrF2‐16BaF2‐2GdF3‐2NaF‐1GaF3‐xTRF3, with x = 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 mol%: and TR = Sm were prepared in a dry box. Absorption spectra at room temperature are obtained in the spectral range from 340 to 2700 nm. From the area under the absorption band we obtained the experimental oscillator strengths, fExp.. By using the Judd‐Ofelt theory and a least‐square fit process, we obtained the phenomenological intensity parameters, Ωλ (λ = 2, 4, 6), and calculated the theoretical oscillator strengths, fCal. In order to evaluate the influence of the odd third‐order intensity parameter over oscillator strengths, we used the modified Judd‐Ofelt model. The better set (the set with smaller r.m.s.) is used to analyze the influence of third‐order effects through odd intensity parameters in the modified model. The results obtained with the standard and modified model are analyzed. In order to evaluate potential applications of Sm3+ ions in these glasses, the better set is used to calculate the following spectroscopy parameters: radiative lifetime, τr, transition probability between multiplets, AJJ’︁, peak cross section to stimulate emission, ρp and branching ratio, βJJ' are calculated. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Novel synthesis and optical properties of Sm 3+ doped Au- polyvinyl alcohol nanocomposite films

A new synthesis of samarium doped Au nano composite polymer films is described and the optical characteristics were analysed. Polyvinyl alcohol act as a reducing as well as capping agent. Optical absorption spectral analysis confirms the presence of Sm 3+ ions and the formation of Au nanoparticles. Au-surface plasmon band intensity increases with the increase of chloro auric acid concentration and the full width at half maxima (FWHM) is reduced, correspondingly. Using Judd–Ofelt theory the oscillator strengths were calculated for Sm 3+ ions. Photoluminescence studies has been carried out and it shows that the incorporation of the nanoparticles quenches the emission from the Sm 3+ ions.

Optical properties of Sm 3+ doped calibo glass with addition of lead oxide

Optical absorption and fluorescence spectra of Sm 3+ doped calibo glasses and the effects on these on addition of lead oxide have been recorded. The concentration of lead oxide has been varied from 0 to 30 mol%. The Judd-Ofelt intensity parameters Ω λ ( λ=2, 4, 6) for f–f transitions in Sm 3+ ions trapped in these glasses are calculated and their variation with increase in proportion of lead oxide has been discussed. It is observed from the fluorescence spectra that the intensity of fluorescence reaches a maximum when 20% of PbO is present. Stimulated emission cross-section is calculated and compared with its value for other lattices.

Optical properties of Sm 3+ ions doped in tellurite glass

Judd–Ofelt analysis of Sm 3+ ions doped in a tellurite glass has been accomplished. Fluorescence and life-time measurements have been carried out using Ar + laser and excimer laser. Stark splitting has been observed in the upper and lower levels in fluorescence. The life-time of 4G 5/2 level as a function of Sm 3+ concentration has been measured. Concentration quenching and the mechanism responsible for the same have been found.

Persistent Spectral Hole Burning and Optical Properties of Sm2+ Doped in Mg0.5Sr0.5FCl0.5Br0.5 Mixed Crystal

A Sm 2+ -containing Mg 0.5 Sr 0.5 FCl 0.5 Br 0.5 mixed crystal was synthesized by firing at 1,100°C 2 hours in a reducing stream of hydrogen gas and examined with an X-ray diffractometer for the crystalline structure. We measured the optical properties of Sm 2+ -ion and observed the efficiencies of persistent spectral hole burning depend on hole burning methods at 90 K and 300 K. At 90 K, PSHB was made much more efficiently by using the photon-gated (two color) spectral hole burning process compared to the one color hole burning process, while the one color hole burning process is much more efficient at 300 K.

Optical properties of Sm 3+ ions in lithium borate and lithium fluoroborate glasses

Optical absorption, excitation, emission spectra and lifetimes are presented for Sm 3+ ions in lithium borate and lithium fluoroborate glasses. Compositional dependence of Judd–Ofelt parameters has been evaluated and these parameters are used to predict radiative lifetimes ( τ R) and branching ratios ( β R) for some excited 4G(4) 7/2, 4G(4) 5/2, 6F 11/2, 6F 9/2, 6F 1/2, 6H 13/2, 6H 11/2 and 6H 9/2 levels. The radiative properties have also been predicted for these excited levels of Sm 3+:borate, oxide, phosphate, fluoride and fluorophosphate glasses and Sm 3+:Y 3Al 5O 12 crystal. The values of electric ( A ed) and magnetic ( A md) dipole transition probabilities, τ R and β Rare presented for the above excited levels. The Judd–Ofelt intensity parameters have been used to predict oscillator strengths which are found to be useful to assign the closely spaced multiplets. The predicted values of τ R and β R are compared with the experimental values for 4G(4) 5/2 level to its lower levels. The stimulated emission cross-sections, σ( λ p), were also evaluated for 4G(4) 5/2→ 6H J transitions. The dependence of the optical properties due to compositional changes of the glasses are discussed and compared with similar results.

Optical properties of Sm 3+ doped lead fluoroborate glasses

We present a study of emission, absorption and vibrational properties of Sm 3+ doped lead fluoroborate glasses (PbO–PbF 2–B 2O 3–Sm 2O 3) as a function of the Sm 3+ content. Changes in the position and the intensity parameters of the transitions are closely related to structural changes in the glass network. A Judd–Ofelt scheme was used to estimate the intensity parameters Ω λ and radiative properties for Sm 3+ in the glass. The behaviour of Ω 2 and Ω 6 parameters suggested a decrease in the asymmetry degree of the local ligand field at Sm 3+ sites and an increase in the covalency of Sm–O bond, respectively. This hypothesis was verified by analysing the structural role of Sm 2O 3 through Raman and infrared spectroscopy measurements.

Spectroscopic studies of Sm3+-doped phosphate glasses

Optical properties of Sm3+ ion in phosphate glassy matrices were studied. The absorption, fluorescence, excitation spectra and decay patterns were obtained at room temperature. The oscillator strengths of the transitions betweenJ manifolds were calculated using Judd-Ofelt theory and compared with the ones obtained experimentally. Various laser intensity parameters such as J-O parameters, radiative transition probabilities, lifetimes, branching ratio, and integrated absorption cross-section were evaluated. Radiative lifetimes of the excited states were determined and used to obtain nonradiative transition rates and quantum yields. Integrated intensity and dynamics of the fluorescence originating from the excited states were also studied as a function of Sm3+ concentration.

Electrical and optical properties of Sm 1−xNd xSe polycrystalline thin films : J Dumas and C Schlenker, Phys Stat Sol (a), 22 (1), 1974, 89–95

Electrical and optical properties of Sm 1−xNd xSe polycrystalline thin films : J Dumas and C Schlenker, Phys Stat Sol (a), 22 (1), 1974, 89–95