Spectral studies of praseodymium doped heavy metal borate glass systems (original) (raw)
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Journal of Alloys and Compounds, 2011
Glasses having composition 20ZnO•xBi 2 O 3 •(79.5 − x)B 2 O 3 •0.5Pr 6 O 11 were prepared by melt quench technique. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction. The spectroscopic properties of these glasses were investigated by recording optical absorption and fluorescence spectra. The structural investigations of the glasses were carried out by recording the IR spectra. The optical properties of Pr 3+ ions doped zinc borate glasses with varying concentration of bismuth oxide have been studied. The Judd-Ofelt intensity parameters˝ (= 2, 4, 6) and other radiative properties like radiative transition probability, radiative life time, branching ratio and stimulated emission crosssection of the prepared glasses have been calculated. The variation of˝2 with Bi 2 O 3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth oxygen (RE-O) covalency. The branching ratio for 3 P 0 → 3 F 2 transition is 42% and the predicted spontaneous radiative transition probability rates are fairly high (14,347-14,607 s −1). This is beneficial for lasing emission. The stimulated emission cross-section for all the emission bands has been calculated.
International Journal of Modern Physics: Conference Series, 2013
Glasses having composition 20CdOxBi2O3(79.5-x)B2O30.5Pr6O11 with x varying from 15 to 35 mol% have been synthesized. Optical absorption and fluorescence spectra were measured at ambient temperature. A close correlation is observed between the Bi2O3 content and the spectroscopic properties such as Judd-Ofelt intensity parameters Ωλ = (λ = 2, 4, 6) , radiative and structural properties of prepared glasses doped with Pr3+ ion. The variation of Ω2 with Bi2O3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth (RE) ion site (due to structural change) and to changes in RE-O covalency, whereas the variation of Ω6 has been related to the variation in RE-O covalency. Following the luminescence spectra, various radiative properties like transition probability (Arad), radiative lifetime (τr), branching ratio (βr) and stimulated emission cross section (σ) have been calculated. The branching ratio for 3P0 → 3F2 transition of Pr3+ glass system arrive at 4...
Luminescence properties of Pr 3 þ doped Li 2 O-MO-B 2 O 3 glasses
Lithium borate glasses of composition 30Li 2 O-10MO-59B 2 O 3 :1Pr 2 O 3 (MO ¼ZnO, CaO and CdO) were prepared by a conventional melt quenching method. The amorphous nature of these glasses was confirmed by X-ray diffraction. Characterization of these glasses was carried out by differential scanning calorimetry and infrared spectra. Optical absorption and photoluminescence spectra of these glasses were investigated. Judd-Ofelt intensity parameters Ω λ (λ ¼2, 4, and 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. From this theory various radiative properties like transition probability A, branching ratio β r , the radiative lifetime τ R , and the stimulated emission cross-section σ P for various emission levels of these glasses have been determined and reported. The relationship between the structural modifications and luminescence efficiencies of all the three glasses is explained. After X-ray irradiation on these glasses, the thermoluminescence emission properties were also studied. The thermoluminescence studies indicate that CdO modified glass gives out the maximum thermoluminescence light output among the three glasses studied.
Judd–Ofelt parameters and radiative properties of Sm3+ ions doped zinc bismuth borate glasses
Optical Materials, 2009
Glasses having composition 20ZnOÁxBi 2 O 3 Á(79 À x)B 2 O 3 (15 6 x 6 35 mol%) and doped with 1 mol% Sm 3+ ions have been prepared by melt quench technique. Optical absorption and fluorescence spectra have been recorded. Judd-Ofelt approach has been applied for the f M f transition of Sm 3+ ions to evaluate various intensity parameters (X 2 , X 4 , X 6). The variations in intensity parameters, radiative transition probabilities and hypersensitive band positions with composition have been discussed. The variation of X 2 with Bi 2 O 3 content have been attributed to change in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth-oxygen (RE-O) covalency, whereas the variation of X 6 is found to be strongly dependent on nephlauxetic effect. The shift of the hypersensitive band shows that the covalency of the RE-O bond increases with increase of Bi 2 O 3 content due to increased interaction between the Sm 3+ ion and non-bridging oxygens. The radiative transition probabilities for the Sm 3+ ions are large in zinc bismuth borate glasses, suggesting their suitability as laser material.
Spectroscopic study of neodymium doped lead-bismuth-borate glasses
American Institute of Physics , 2016
This paper reports on different physical and optical properties of rare earth doped heavy metal oxide glasses. The glass composition of 10Bi2O3-30PbO-60B2O3-xNd2O3 where x = 0, 0.1, 0.2, 0.5 and 1 (in mol %) has been synthesized using melt-quenching technique. Refractive index measurements for these glasses were done and physical parameters were studied. Structural properties of these glasses were analysed through infrared spectra that was recorded between 1600cm-1 and 300cm-1 in transmission mode. The optical absorption spectra were recorded in the wavelength range from 300 to 700 nm. The transitions originated from ground state energy 4I9/2. The energy level analysis has been carried out by considering absorption spectral bands. The results thus obtained are comparable with reports on similar glasses, indicating that the prepared glasses may have potential laser applications.
Visible red, NIR and Mid-IR emission studies of Ho 3+ doped Zinc Alumino Bismuth Borate glasses
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/authorsrights a b s t r a c t Zinc Alumino Bismuth Borate (ZnAlBiB) glasses doped with different concentrations of Holmium were prepared by conventional melt quenching technique. The glassy nature of these glasses has been confirmed through the XRD spectral measurements. The FTIR spectra recorded for undoped glass revealed the information related to the functional groups involved in the host glass. Optical absorption, excitation and photoluminescence spectra of these glasses have been recorded at room temperature. The Judd–Ofelt theory has been applied successfully to characterize the absorption spectra of the ZnAlBiB glasses. From this theory various radiative properties such as radiative transition probability (A R), radiative lifetimes (s R), branching ratios (b R) and spectroscopic quality factor (v) for the prominent emission levels 5 F 5 ? 5 I 7 , 5 F 5 ? 5 I 8 and 5 I 7 ? 5 I 8 have been evaluated. The photoluminescence spectra revealed the quenching of luminescence intensity beyond 1.0 mol% of Ho 3+ ion concentration in ZnAlBiB glasses. To investigate the lasing potentiality of 5 F 5 ? 5 I 7 , 5 F 5 ? 5 I 8 and 5 I 7 ? 5 I 8 transitions, the effective band width (Dk p) and the stimulated emission cross-section (r se) were determined. The CIE chromaticity co-ordi-nates were also evaluated from the emission spectra for all the glasses to understand the suitability of these materials for visible red laser emission in principle.
New Journal of Glass and Ceramics, 2016
Glass sample of Zinc Lithium Bismuth Borate (25−x) Bi2O3:20Li2O:20ZnO:35B2O3:xPr6O11, (where x = 1, 1.5 and 2 mol%) has been prepared by melt-quenching technique. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction. The absorption spectra of three Pr 3+ doped zinc lithium bismuth borate glasses have been recorded at room temperature. The observed optical spectra are discussed in terms of energy states and the intensity of the transitions. The various interaction parameters like Slater-Condon, Lande, bonding and Racah parameters have been computed. Judd-Ofelt intensity parameters and laser parameters have also been calculated. The stimulated emission cross section (σp) for the transition (3 P0 → 3 F2) is found to be in the range 3.12-10.43 × 10 −20 cm 2. The σp values are comparatively large suggesting the possible utilization of these materials in laser applications.
Zinc Alumino Bismuth borate (ZnAlBiB) optical glasses of different compositions doped with 1 mol% of Dy 3+ ions were prepared by the conventional melt quenching technique and investigated by the XRD, optical absorption, photoluminescence and decay curve analysis. The glassy nature of ZnAlBiB host has been confirmed through XRD measurements. From the absorption spectral measurements, the three phenomenological intensity parameters Ω λ (λ ¼2,4 and 6) have been determined from the Judd–Ofelt (J–O) theory. By using JO intensity parameters, several radiative properties such as transition probability (A R), branching ratio (β R) and radiative lifetimes (τ R) have been determined. The room temperature photoluminescence spectra of Dy 3+ ions doped ZnAlBiB glasses gave two relatively intense emission bands 4 F 9/2-6 H 15/2 (blue), 4 F 9/2-6 H 13/2 (yellow) along with one faint band. The higher values of branching ratios and stimulated emission cross-sections for the 4 F 9/2-6 H 13/2 transition suggest the utility of these glasses as potential laser materials. The decay curves have been recorded for all the ZnAlBiB glasses to measure the quantum efficiency of these glasses by measuring the experimental lifetime (τ exp). The radiative properties and CIE chromaticity coordinates have been evaluated from the emission spectra to understand the feasibility of these glasses for optoelectronic devices.
Spectroscopic Properties of Er3+ Doped Zinc Lithium Bismuth Borate Glasses
IOSR Journal of Applied Physics, 2016
Zinc lithium bismuth borate glasses containing Er 3+ in (25-x): Bi 2 O 3 :20Li 2 O:20ZnO: 35B 2 O 3 :xEr 2 O 3 (where x=1, 1.5,2 mol %) have been prepared by melt-quenching method. The amorphous nature of the glasses was confirmed by x-ray diffraction studies. Optical absorption and fluorescence spectra were recorded at room temperature for all glass samples. Judd-Ofelt intensity parameters Ω λ (λ=2, 4, 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. Using these intensity parameters various radiative properties like spontaneous emission probability, branching ratio, radiative life time and stimulated emission cross-section of various emission lines have been evaluated.