Optical properties of Sm 3+ doped lead fluoroborate glasses (original) (raw)
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Spectroscopic properties of lead fluoroborate and heavy metal oxide glasses doped with Yb< sup> 3+
2002
Energy transfer at 1500 nm in lead fluoroborate glasses (PbO-PbF 2-B 2 O 3) codoped with Er 3ϩ and Yb 3ϩ is studied for the first time to the authors' knowledge. A sample codoped with 1 mol. % of Yb 2 O 3 and 0.01 mol. % of Er 2 O 3 has a measured fluorescence lifetime of (1.30 Ϯ 0.07) ms and an energy transfer efficiency of 80%. Also, a large emission band, of 72.4 nm has a measured peak emission cross section of (0.73 Ϯ 0.06) ϫ 10 Ϫ20 cm 2. The calculated Judd-Ofelt parameters are ⍀ 2 ϭ (3.51 Ϯ 0.14) ϫ 10 Ϫ20 cm 2 , ⍀ 4 ϭ (1.09 Ϯ 0.07) ϫ 10 Ϫ20 cm 2 , and ⍀ 6 ϭ (0.94 Ϯ 0.07) ϫ 10 Ϫ20 cm 2. The temporal evolution of the Yb 3ϩ fluorescence is fitted by use of the Yokota-Tanimoto expression to yield the Yb 3ϩ diffusion constant ͓(1.6 Ϯ 0.2) ϫ 10 Ϫ10 cm 2 s Ϫ1 ͔ and the critical radius of Yb 3ϩ /Er 3ϩ (18 Ϯ 1) ϫ 10 Ϫ8 cm. Results with the singly doped samples produced are presented to clarify the energy transfer process.
Absorption and fluorescence studies of Sm3+ ions in lead containing sodium fluoroborate glasses
Journal of Luminescence, 2011
Lead containing calcium zinc sodium fluoroborate glasses (LCZSFB) with molar composition of 20PbOþ 5CaO þ5ZnO þ10NaFþ (60 À x) B 2 O 3 þ x Sm 2 O 3 , (x ¼ 0.1, 0.25, 0.5, 1.0 and 2.0 mol%) were prepared and investigated by the XRD, FTIR, optical absorption, photoluminescence and decay curve analysis. Judd-Ofelt theory was applied to the experimental oscillator strengths to evaluate the phenomenological J-O intensity parameters X l (l¼ 2, 4 and 6). Using the J-O intensity parameters as well as from the emission and decay measurements, various radiative parameters such as transition probabilities (A R), radiative lifetimes (t R), measured lifetimes (t m), calculated branching ratios (b R), measured branching ratios (b m), effective bandwidth (Dl eff) and stimulated emission cross sections s(l p) have been calculated for the excited 4 G 5/2 luminescent level. The nature of decay curves of 4 G 5/2 level for different Sm 3 þ ion concentrations in all LCZSFB glasses has been analyzed and the lifetimes are noticed to decrease with increase of concentration. The concentration quenching has been attributed to the energy transfer through the cross-relaxation between Sm 3 þ ions. Based on these results, the utility of Sm 3 þ ions doped lead containing fluoroborate glasses as laser active materials in the visible region is discussed.
A new series of Sm 3þ doped leadfluoro-borophosphate glasses with the composition 50B 2 O 3 þ(20Àx) P 2 O 5 þ10Li 2 Oþ10ZnF 2 þ10PbO þ xSm 2 O 3 (where x ¼ 0, 0.05, 0.1, 0.25, 0.5, 1 and 2 in wt%) were prepared by following the melt quenching technique and their structural and spectroscopic behavior were studied through XRD, FTIR, optical absorption, luminescence and decay measurements. The presence of fundamental vibrational groups such as BO 3 , BO 4 and PO 4 were explored through the FTIR spectral measurements and further increasing BO 4 units with NBO were also found out. The nephelauxetic effect and Judd-Ofelt (JO) theory have been applied to investigate the nature of the SmeO bond and the local environment around the Sm 3þ ion site. The luminescence intensity decreases with the increase in Sm 3þ ion concentration beyond 0.5 wt% and the same was discussed through various energy transfer mechanism which takes place between Sm 3þ ions. The lasing parameters like stimulated emission crosssection (s E p ), branching ratios (b R ) and radiative lifetime (t cal ) for the 4 G 5/2 / 6 H 5/2 , 4 G 5/2 / 6 H 7/2 , 4 G 5/2 / 6 H 9/2 and 4 G 5/2 / 6 H 11/2 emission transitions have been calculated, discussed and reported. The R/O intensity ratios have been studied by varying the RE ion concentration and further CIE color chromaticity coordinates have also been calculated to characterize the emission of the prepared glasses. The color purity and the correlated color temperature were also calculated and the results were discussed in the present work. The decay of the 4 G 5/2 excited level is found to be single exponential upto 0.1 wt% and after that it changes into non-exponential for higher concentration and the non-exponential behavior arises due to the energy transfer between the Sm 3þ ions through various cross-relaxation channels and the decay of the 4 G 5/2 excited level have been analyzed with IH model. Among the prepared glasses, BPLP0.5S glass exhibits higher s E p , b R , s E p  t R and s E p  Dl eff values corresponding to the 4 G 5/2 / 6 H 7/2 emission band and these are in turn specifies its suitability for LEDs and visible laser applications.
Synthesis, optical spectra and radiative properties of Sm2O3:PbO:P2O5 glass materials
Optical Materials, 2008
The paper presents the synthesis and spectroscopic properties of 46PbO:53P 2 O 5 :Ln 2 O 3 glasses, where Ln = Sm or 0.1Sm + 0.9Gd. The glasses show intense luminescence dominated by the orange 4 G 5/2 ? 6 H 7/2 transition. The luminescence branching ratios and quantum yields have been computed using the Judd-Ofelt analysis of relevant absorption spectra and the observed luminescence lifetimes; the maximum found quantum yield was 69%. The lifetimes and the quantum yields depended on the time of heating the samples at high temperature and on the samarium concentration.
Influence of modifier oxides on spectroscopic properties of Sm 3+ doped lithium fluoroborate glass
h i g h l i g h t s " Structural properties of Sm 3+ doped borate glasses were characterized by XRD and FTIR techniques. " The effect of modifier oxides on J-O intensity parameters and radiative properties are studied. " Sm 3+ doped lithium fluoro-borate glasses exhibits intense reddish-orange emission. " Decay curves of 4 G 5/2 state exhibits non-exponential nature in all the glasses. a b s t r a c t Sm 3+ doped lithium fluoro-borate glasses with different modifier oxides (Li 2 B 4 O 7 -BaF 2 -NaF-MO where M = Mg, Ca, Cd and Pb) and combinations of modifier oxides (Li 2 B 4 O 7 -BaF 2 -NaF-MgO+CaO, Li 2 B 4 O 7 -BaF 2 -NaF-CdO+PbO) were prepared by means of melt quenching method. These samples were characterized by XRD, FTIR, optical absorption and fluorescence techniques at room temperature. The XRD profiles of all the glasses confirm their amorphous nature and the FTIR spectra reveal the presence of BO 3 and BO 4 units along with the strong OH À groups in the glass matrices. The influence of modifier oxides on Judd-Ofelt (J-O) intensity parameters and intensity of the emission lines are reported. Judd-Ofelt theory is used to study the spectral properties and to calculate the radiative transition probabilities (A T ), branching ratios (b R ), integrated absorption cross sections (R) and radiative lifetimes (s R ) for certain spectral transitions. From the emission spectral analysis, emission cross-sections (r P ) are calculated for the four emission transitions, 4 G 5/2 ? 6 H 5/2 , 4 G 5/2 ? 6 H 7/2 , 4 G 5/2 ? 6 H 9/2 and 4 G 5/2 ? 6 H 11/2 of Sm 3+ ion in different lithium fluoro-borate glasses. Among the four transitions, it is observed that the transition 4 G 5/2 ? 6 H 7/2 has higher emission cross-section (r P ) in all the glass matrices, except in Mg, Cd and Mg-Ca glass matrices. The non-exponential nature of the luminescence decay curves of 4 G 5/2 level of Sm 3+ doped glass matrices are also reported.
Journal of Alloys and Compounds, 2014
This study reveals the effect of PbF 2 and CdF 2 addition on the aluminosilicate oxyfluoride glass network over a wide compositional range. The structure of glasses in SiO 2-Al 2 O 3-PbF 2 and SiO 2-Al 2 O 3-PbF 2-CdF 2 system matrices was studied by using DTA, XRD, UV-VIS, density, Raman and FTIR spectroscopy. The observed shifts of absorption edge due to band gap variations with heavy metal fluoride (HMF) addition are compared with theoretical model of optical basicity and physical parameters derived from density. The variation in T g , and stability factor are supported by Raman and FTIR results which show formation of NBOs and other super structural units with addition of HMF in the aluminosilicate network.
High-pressure dependence of Sm3+ emission in PbO–PbF2–B2O3 glasses
Journal of Materials Science Letters, 2000
Rare-earth doped glasses have been extensively studied due to their potential applications in optical devices such as solid state lasers and optical fibers. These systems are very attractive because they can be easily prepared in different shapes and sizes, accept rare-earth ions without inducing crystallization, and exhibit large optical transparency window covering ultraviolet, visible and infrared regions. The knowledge of the optical properties of rare-earth ions in glass is very important in order to optimize the best ion-host configuration.
Spectroscopic properties of lead fluoroborate glasses codoped with Er^3+ and Yb^3+
Journal of The Optical Society of America, 2002
A new glass of heavy metal oxide (25.0Bi 2 O 3 -57.0PbO-18.0Ga 2 O 3 (mol%)) doped with Yb 3þ is presented and compared with lead fluoroborate glass (43.5H 3 BO 3 -22.5PbCO 3 -34.0PbF 2 (mol%)), also doped with ytterbium. The interest in Yb 3þ for laser action and short pulse generation under diode pumping has been reported in the literature. Spectroscopic properties were studied for both glasses doped with 0.5 mol% of Yb 2 O 3 . The absorption cross-section of the heavy metal oxide glass is ð2:20 AE 0:15Þ Â 10 À20 cm 2 at the absorption peak wavelength of 968 nm and its emission cross-section is ð0:75 AE 0:05Þ Â 10 À20 cm 2 at the extraction wavelength of 1012 nm. A fluorescence effective linewidth of 86 nm and a fluorescence lifetime of 0.40 ms were measured. In the case of the lead fluoroborate glass used for comparison, these values change to ð2:56 AE 0:18Þ Â 10 À20 cm 2 (absorption cross-section), ð1:07 AE 0:08Þ Â 10 À20 cm 2 (emission cross-section at 1022 nm), 60 nm (fluorescence effective linewidth) and 0.81 ms (fluorescence lifetime). Calculations of the minimum pump intensity are also presented. Both have spectroscopic properties for laser applications that are similar to those of other known glasses (phosphate and tellurite laser glasses) used as active laser media. The large emission bandwidth measured for the heavy metal oxide is of interest for tunable lasers. Ó
Spectroscopic properties of lead fluoroborate and heavy metal oxide glasses doped with Yb 3+
Journal of Non-crystalline Solids, 2002
A new glass of heavy metal oxide (25.0Bi2O3–57.0PbO–18.0Ga2O3 (mol%)) doped with Yb3+ is presented and compared with lead fluoroborate glass (43.5H3BO3–22.5PbCO3–34.0PbF2 (mol%)), also doped with ytterbium. The interest in Yb3+ for laser action and short pulse generation under diode pumping has been reported in the literature. Spectroscopic properties were studied for both glasses doped with 0.5 mol% of Yb2O3. The absorption cross-section of the heavy metal oxide glass is (2.20±0.15)×10−20 cm2 at the absorption peak wavelength of 968 nm and its emission cross-section is (0.75±0.05)×10−20 cm2 at the extraction wavelength of 1012 nm. A fluorescence effective linewidth of 86 nm and a fluorescence lifetime of 0.40 ms were measured. In the case of the lead fluoroborate glass used for comparison, these values change to (2.56±0.18)×10−20 cm2 (absorption cross-section), (1.07±0.08)×10−20 cm2 (emission cross-section at 1022 nm), 60 nm (fluorescence effective linewidth) and 0.81 ms (fluorescence lifetime). Calculations of the minimum pump intensity are also presented. Both have spectroscopic properties for laser applications that are similar to those of other known glasses (phosphate and tellurite laser glasses) used as active laser media. The large emission bandwidth measured for the heavy metal oxide is of interest for tunable lasers.
The Egyptian Journal of Chemistry, 2021
The rare-earth-doped glasses have a great significance for promise applications in optical devices and laser technology. The glass samples prepared by melt quenching technique. XRD, FTIR, UV/VIS/NIR spectrophotometer and photoluminesces used to study the structure and properties of the glass samples. And found that the glass samples in the amorphous, the lead oxide enters the glass network as a former, analysis of splitting of Nd3+ in glasses, UV—Vis—IR spectra exhibit ten prominent bands centered at 428, 457, 471, 511, 524, 582, 624, 679, 744, 803 and 875 nm correspond to the transition from the ground state 4I9/2 to 2P1/2, 4G11/2, 2D3/2+2G9/2+2P3/2, 4G9/2, 2K13/2+4G7/2, 4G5/2+2G7/2, 2H11/2, 4F9/2, 4S3/2+4F7/2, 4F5/2+2H9/2, and 4F3/2 respectively. The Judd–Ofelt intensity parameters Ωλ (λ=2, 4, 6) determined from the absorption bands intensities of as Ω6>Ω4>Ω2. The emission peak intensity at 625 nm decreases with the Nd3+ concentrations increase due to the quenching effect.