Calculation of Judd Ofelt parameters: Sm3+ ions doped in zinc magnesium phosphate glasses (original) (raw)
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Spectroscopic studies of Sm3+-doped phosphate glasses
Bulletin of Materials Science, 1998
Optical properties of Sm 3+ 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 between J 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 Sm 3÷ concentration.
Spectroscopic and radiative properties of Sm3+- doped phosphate glasses
Sm 3 þ -doped K-Mg-Al phosphate glasses were prepared and characterized through various spectroscopic techniques such as optical absorption, excitation, photoluminescence spectra and decay rate analysis at room temperature to derive spectroscopic and radiative properties of Sm 3 þ ions in these glasses. Energy parameters for the 4f 5 electronic configuration of Sm 3 þ ion in K-Mg-Al phosphate glass have been determined using free-ion Hamiltonian model. Judd-Ofelt (JO) analysis has been applied to evaluate the JO intensity parameters, O l (l¼ 2, 4 and 6), and in turn radiative properties such as radiative transition probability, branching ratio, radiative lifetime and peak stimulated emission crosssection for the fluorescent 4 G 5/2 level of Sm 3 þ ion have been determined. The fluorescence decay rates exhibit single exponential at lower concentrations (r 0.1 mol%) and turn into non-exponential at higher concentrations (Z 0.5 mol%). The experimental lifetime for the 4 G 5/2 level as a function of Sm 3 þ ions concentration decreases from 2.77 to 0.74 ms when the concentration is increased from 0.05 to 2.0 mol% of Sm 2 O 3 due to energy transfer process. The non-exponential decay rates are well-fitted to Inokuti-Hirayama model for S ¼ 6 indicating that the nature of the energy transfer process is of dipoledipole type. The systematic analysis on decay rates indicates that the energy transfer mechanism depends on Sm 3 þ ion concentration as well as glass composition.
Spectroscopic properties of Sm3+ ions in phosphate and fluorophosphate glasses
Journal of Non-Crystalline Solids, 2013
Spectroscopic properties of Sm 3+ -doped phosphate and fluorophosphate glasses of the composition (60− x/2) P 2 O 5 +15 K 2 O+ (15− x/ 2) SrO+ 10 Al 2 O 3 +x Sm 2 O 3 (PKSASm) and (54− x/ 2) P 2 O 5 +14 K 2 O+10 KF+ (13− x/ 2) SrO+ 9 Al 2 O 3 +x Sm 2 O 3 (PKFSASm), where x=0.1, 0.5, 1.0, 2.0, 4.0 and 6.0 mol%, have been investigated. The oscillator strengths and the intensity parameters (Ω 2 , Ω 4 and Ω 6 ) have been determined using the Judd-Oflet theory, which in turn is used to predict the radiative transition probability (A R ), radiative lifetime (τ R ) and branching ratios for the fluorescent 4 G 5/2 level. The higher stimulated emission cross-sections, 12.27× 10 −22 and 14.12×10 −22 cm 2 have been observed for the 4 G 5/2 → 6 H 9/2 transition of PKSASm10 and PKFSASm10, respectively. The non-exponential nature of the decay curves of the 4 G 5/2 level increases with increase in Sm 3+ ion concentration accompanied by decrease in lifetime. The non-exponential decay curves have been best fitted to the generalized Yokota-Tanimoto model indicating that the energy transfer among optically active ions is through dipole-dipole interaction.
Journal of Materials Science: Materials in Electronics, 2023
A spectroscopy study was performed to investigate the absorption and emission behavior of zinc-lead phosphate-doped Sm 3? glasses sample. The parameters, density, q, molar volume, V m , samarium ion concentration N, and mean samarium ion separation, R were calculated. The absorption peaks were assigned and discussed. The band gap and Urbach's energies analysis were illustrated. The emission spectra and the emission lifetime decay were studied. The CIE diagram coordinate (0.393, 0.601) of the sample's emission was very close to the TV standard value. The oscillator strength f cal and f exp were calculated using Judd-Ofelt theory, and the model parameter trend was found to be X 4 [ X 2 [ X 6 which indicates high glasses rigidity. The Absorption and emission cross-sections were studied and illustrated. The obtained optical parameters, absorption, and emission behaviors introduce the samples under investigation as a candidate for orange and reddish-orange photonic applications.
Judd-Ofelt intensity parameters and laser analysis of Tm3+ in certain sulphate glasses
Journal of Non-Crystalline Solids, 1992
In this paper, we report the preparation and optical characterization of Mn 2 activated Pr 3 doped phosphate glasses in four dierent chemical compositions. The optical absorption spectra of Pr 3 ions in phosphate glasses have been recorded in the UV±VIS±NIR region. From the data available in the optical absorption spectra, various spectroscopic parameters such as Slater±Condon (F 2 , F 4 , F 6 ), Racah (E 1 , E 2 , E 3 ), spin-orbit interaction (n 4f ) and Judd±Ofelt (J±O) (X 2 , X 4 , X 6 ) parameters are derived. The calculated values of the J±O parameters are utilized in evaluating the various radiative parameters such as electric dipole line strengths (S ed ), magnetic dipole line strengths (S md ), radiative transition probabilities (A RAD ), radiative lifetimes (s RAD ),¯uorescence branching ratios (b R ) and the integrated absorption crosssections (r a ) for stimulated emission from various excited states of Pr 3 ion. The principal¯uorescence transitions of interest are identi®ed by recording the¯uorescence spectrum and measuring their stimulated emission cross-section and optical gain. Quantum eciencies of the prominent lasing transitions are estimated by measuring their radiative and uorescence lifetimes. The dependence of eective radiative lifetime on Pr 3 ion concentration is discussed in the light of non-radiative processes such as multiphonon relaxation and energy transfer between like and unlike ions. Ó
Journal of Electronic Materials, 2020
Luminescent phosphate glasses having the composition 40P 2 O 5-30ZnO-20BaF 2-3.8K 2 TeO 3-1.2Al 2 O 3-5Nb 2 O 5 in mol.% doped with 3 9 10 3 ppm and 4 9 10 3 ppm Sm 2 O 3 were successfully prepared by a melt-quenching technique. The investigated glasses were characterized by x-ray diffraction, UVvisible-NIR, absorption, emission, and fluorescence lifetime analysis. The radiative properties were calculated using Judd-Ofelt (J-O) spectral intensity parameters for each of the glasses, which revealed the following trend: X 2 > X 4 > X 6. The J-O intensity parameters were used to evaluate the spontaneous emission properties including branching ratios, transition probabilities, and radiative lifetime. The value of the optical energy band gap was found to decrease with an increase in Sm 3+ content, which is explained on the basis of structural changes. The calculated stimulated emission cross-section r SE ; at 1.62 lm of glasses studied was high, and increased from 3.81 9 10 À21 cm 2 to 4.38 9 10 À21 cm 2 with increasing Sm 3+ ion concentration. The structure of the glasses was investigated by computing Internuclear r i ð Þ, Polaron radius r p À Á and field strength F ð Þ and measurement of Raman spectra.
Journal of Luminescence, 2015
The fluorescence properties of different concentrations of Sm 3 þ doped zinc-aluminum-sodium-phosphate (ZANP) glasses were studied by the XRD, SEM, FTIR, TG-DTA, optical absorption, photoluminescence and decay cure analysis. X-ray diffraction profiles and SEM images confirmed the amorphous nature of the glass samples. Structural information of these glass matrices was provided by FTIR spectrum. Judd-Ofelt (J-O) theory was applied to the experimental oscillator strengths to evaluate three phenomenological J-O intensity parameters, Ω λ (λ¼ 2, 4 and 6). Using J-O intensity parameters and emission spectra, various radiative parameters such as radiative transition probabilities (A R ), radiative lifetimes (τ R ), calculated and measured branching ratios (β R and β m ), effective bandwidths (Δλ eff ) and stimulated emission cross-sections (σ P ) were calculated for observed emission transitions. The intensity of emission transitions with the variation of Sm 3 þ ion concentration was studied. The nature of decay curves of 4 G 5/2 level for different Sm 3 þ ion concentrations in ZANP glass was analyzed and obtained measured lifetimes (τ exp ). Quantum efficiency of 4 G 5/2 level was calculated based on experimental and measured radiative lifetimes (τ exp and τ R ).
Optik, 2018
Luminescence mechanism of RE doped glasses is significant in optical devices, the glasses of compositions (80-x) P2O5-20CaSO4-(x) Sm2O3 with 0.3 ≤ x ≤ 1.5 mol% have been prepared by melt-quench method. The result of XRD patterns affirmed the amorphous nature of the samples. The structure was investigated successfully using FTIR, NMR and Raman in order to examine the molecular vibrational modes and to verify the de-polymerization process. Absorption and photoluminescence spectra of Sm2O3 doped calcium ultra-phosphate glasses have been reported. Three emission band of Sm 3+ centered at 4 G5/2→ 6 H9/2 (642 nm), 4 G5/2→ 6 H7/2 (597 nm) and 4 G5/2→ 6 H5/2 (559 nm) have been observed at λexc= 402 nm. The spectroscopic research reveals the de-polymerization pattern in P2O5 glass structure by conversion of Q3→Q2→Q1 and to Qo units. Physical and optical properties were investigated, doped ions were successfully position at interstice spaces in CSP, the physical properties such as, density, Polarizability, Molar refractivity, and refractive index etc, have been estimated. The absorption spectra in the wavelength range 900-1700 nm were determined, the spectra consist of seven absorption peaks corresponds to transitions from 6 H5/2 ground state to excited state. From the absorption edge spectra, the band gap (direct and indirect) and the Urbach energy (ΔE) values were evaluated. The conventional JO (Judd-Ofelt) intensity parameters (Ω2, Ω4 and Ω6) and root mean square (δrms) deviation have been evaluated and discussed with respect to Sm 3+ concentration. Obtained result goes along with the Sm 3+ doped magnesium zinc sulfo-phosphate glasses for advancement of many functional glasses.
Journal of Non-Crystalline Solids, 2019
Zinc-phosphate glasses doped with different concentrations of Nd 3+ ions have been prepared by the melt quenching technique and characterized the spectroscopic properties. The physical properties by means of density and molar volume are determined. The amorphous nature of the glasses has been confirmed by X-ray diffraction analysis. FTIR spectra exhibited the fundamental stretching vibrations modes of glass network. In order to study the spectroscopic properties of fabricated glasses, absorption and emission spectroscopy has been performed. Additionally, the spectroscopic properties of Nd 3+ ions were analyzed using J-O theory. UV-Vis-NIR absorption spectra of glass samples divulged twelve significant peaks. Considerable enhancement of Ω 2 values with increasing neodymium content indicated an improvement in the covalency and asymmetry of Nd 3+ ions environment. Under the excitation of 808 nm laser diode, two near-infrared emission bands at around 890 and 1060 nm from 4 F 3/2 → 4 I 9/2 and 4 I 11/2 radiative transitions respectively were observed in the Nd 3+ single doped glasses. The major intensity is observed for 1060 nm for such glass samples. Nd 3+ ions dopant is found to augment the luminescence intensity by a factor as much as 2.23 times as the concentration of Nd 3+ ions increase up to 1.5 mol%. The lifetimes of this level has been experimentally determined through decay profile studies. The developed glass possesses high fluorescence quantum efficiency (η = 96%). The results indicate that the prepared glass system could be a suitable candidate for using it as laser gain media around 1060 nm, solid-state lasers and fiber amplifiers.